Ninjago (TV series)

Long before time had a name, the First Spinjitzu Master created the realm of Ninjago with the four Golden Weapons of Spinjitzu: the Scythe of Quakes, the Shurikens of Ice, the Nunchucks of Lightning, and the Sword of Fire. Before he passed, his sons swore to protect the weapons from evil, but the older brother, Garmadon, was taken over by darkness and aimed to wield all four weapons so he could recreate Ninjago in his own image. In the ensuing battle between brothers, the younger brother Wu cast Garmadon down to the Underworld, hiding the weapons across the land and placing a guardian at each hiding spot. In anticipation of Garmadon's return, Wu seeks out four talented young Ninja to learn the ways of the Ninja, master the art of Spinjitzu, and find the Golden Weapons before Garmadon and his minions can claim them for their maniacal machinations.

Since Lord Garmadon's disappearance, peace has returned to Ninjago. Rather than prepare for his return, the Ninja have become lazy, playing video games and eating junk food instead of continuing their training. With their guard down, they find themselves thrown back into action when Garmadon's son Lloyd releases the five warring tribes of Serpentine, a race of snake-people who once ruled over Ninjago before being sealed away in underground tombs. Now led by the treacherous Pythor P. Chumsworth, last of the fearsome Anacondrai, the vengeful snakes seek to find the four Silver Fangblades to awaken the Great Devourer, an indestructible giant serpent that grows the more it consumes. To stop them, the Ninja make new allies as they try to overcome emotional barriers and unlock their True Potential and trying to learn the identity of the legendary Green Ninja spoken of in a prophecy.

With the Golden Weapons now in Lord Garmadon's possession, the Ninja begin training Lloyd so that he can face his father one day and save Ninjago, something which he was afraid to for the sake of their bond. Garmadon works to thwart the prophecy by recruiting the masterless Serpentine and merging the Golden Weapons into the powerful Mega Weapon. After Garmadon's last attempt ended with Lloyd being aged into a teenager, like his four mentors, he attempts to change the events of the past. The original four Ninja follow Garmadon and use the Golden Weapons of the past to destroy the Mega Weapon, restoring the timeline and sending the Golden Weapons into space.

While Garmadon ends up on an island with a disembodied voice called the Overlord, the venom of the Great Devourer seeps into catacombs beneath Ninjago and animates the Stone Army, trapping the Serpentine underground in the process. Along with Misako, Lloyd's mother, the Ninja travel to the Dark Island to stop Garmadon. The Ninja fail to stop the countdown to the final battle, and the Overlord is revealed to be the dark lord from the prophecy. He possesses Garmadon and heads to Ninjago, with the Ninja in tow. After they found a way out of the Island, Lloyd uses his newfound Golden Power to defeat the Overlord, purge Garmadon of his evil, and become the Golden Ninja.

After the Overlord was defeated by Lloyd, Ninjago City was in complete ruins. However, a man named Cyrus Borg believed that if they worked together, they could achieve anything. In a matter of weeks, Ninjago had been rebuilt into a futuristic metropolis, and was now New Ninjago City.

Without an enemy to fight, Ninja became teachers at Master Wu's Academy. One day, they received clearance for a field trip to Borg Industries. But upon arrival, they learn that the Overlord survived the final battle and is trapped in the Digiverse as a virus. Cyrus Borg realizes this and gives the Ninja the Techno Blades, which are the keys to destroy the Overlord.

The Overlord uses P.I.X.A.L. (an android who works at Borg Industries) to create an army of Nindroids from Zane's blueprints and plans to capture Lloyd, as his Golden Power will help him escape the digital realm. The hard drive containing the Overlord is later stolen by Pythor, revealed to have survived being eaten by The Great Devourer.

He captures Lloyd, and the Overlord drains him of most of his Golden Power. Though the Ninja defeat him in the Digiverse, the Overlord escapes the digital realm half-formed. Lloyd then splits his remaining Golden Power among the four Ninja therefore restoring their Elemental abilities, knowing that the power would be a big responsibility for him to bear alone.

The Overlord, needing to complete his transformation, sends the Nindroids to space to retrieve the Golden Weapons from the constellation Arcturus, which they succeed in doing. The Overlord becomes the Golden Master, fulfilling an old Serpentine prophecy, and wreaks havoc on New Ninjago City. With no other option, Zane sacrifices himself to destroy the Golden Master. However, he survives, trapped in the systems and rebuilds himself using titanium.

After the loss of Zane, the team is split apart, and Lloyd seeks to rebuild it. But everything changes when they find out that Zane is alive, and that crime lord, Master Chen, invites the Ninja and the other Elemental Masters to a Tournament, so that he can steal their powers in order to complete a spell that will turn him and his worshippers into Anacondrai.

After Garmadon's sacrifice to stop Chen and the Anacondrai Cultists, Lloyd is faced with the loss of his father and depression. However, when he is possessed by Morro, former student of Master Wu and the Elemental Master of Wind, the Ninja must stop him from finding the Tomb of the First Spinjitzu Master and cursing the Sixteen Realms by releasing his master, the Preeminent, while learning a new fighting style, Airjitzu, along the way.

The Ninja become stronger as they find new friends, face their fears, and find secrets that have been hidden. The Ninja face many new adventures as Lloyd is possessed. They uncover the three secrets of Airjitzu, retrieve the Sword of Sanctuary, and locate the first Spinjitzu's Master's tomb.

Master Wu reveals that Nya can have the control over the element of Water as her mother did. She joins the Ninja and unlocks her True Potential to save Ninjago from being destroyed by the Preeminent.

Clouse (the only escapee from the Cursed Realm), finds the Teapot of Tyrahn and frees the evil Djinn, Nadakhan, from it. Nadakhan then traps Clouse in it by making him "wish it all away." Nadakhan proceeds to frame the Ninja, making them wanted criminals. The Ninja try to find Clouse in Stiix but are forced to flee because they are chased by the citizens, who are angry with them for destroying their town. In an attempt to rescue the ninja, Misako pilots the Destiny's Bounty but it ends up crashing through the doings of the police. The Ninja manages to split up and escape but Misako gets arrested.

Meanwhile, Nadakhan finds Master Wu in the Domu library and hears him saying, "Be careful what you wish for," before imprisoning him in the Teapot of Tyrahn. When Misako is left in a room handcuffed, Nadakhan comes and tricks Misako into telling him the secret location of the Realm Crystal and also imprisons her in his teapot. Ronin is then hired by the Police Commissioner to find the Ninja and bring them to justice. While the Ninja split up into three teams of two, Jay and Cole discover that Nadakhan can shapeshift, explaining how he framed them. After Ronin cunningly captures all of the Ninja, they are brought to Kryptarium Prison.

Nadakhan goes to the location of the Realm Crystal in the Hiroshi Labyrinth Stronghold and steals it. At Kryptarium Prison, the Ninja find Captain Soto and he tells them how to catch a Djinn, the answer being to use a drop of Tiger Widow venom to weaken Nadakhan. After freeing Soto and themselves, Captain Soto tells them that the last Tiger Widow lived on an island not found on any map but in a lantern hidden on Misfortune's Keep.Meanwhile, Nadakhan (who was once a pirate) freed his crew from different realms from which they were banished to. The police were focused on finding the Ninja but unknown to them, Nya and Jay were disguised as policemen and had logged in to the police system. They searched for Nadhakan's ship but found nothing.

Meanwhile, Cole and Lloyd flew on their Elemental Dragons back to the last known location of Nadhakan's ship only to find electric wiring and other metal parts. Zane and Kai went to the crash site of the Destiny's Bounty only to find the need to escape, leaving their ship behind. Meanwhile, Nadakhan and his crew visit to his home realm, Djinjago, but it was slowly falling apart. Nadhakan's father, the Djinn King, told Nadakhan that the Sixteen Realms were all interconnected. When the Ninja destroyed the Cursed Realm, they also destroyed Djinjago. Nadhakan's father gave him the Sword of Souls, a sword that had the power to hold life forces. Nadhakan then slashed the Teapot of Tyrahn with it, causing the souls of Clouse, Master Wu, and Misako to transfer into the sword. He then returned to Ninjago and swore the Ninja would pay for their actions. However, the Ninja learned much about the true enemy and got the only thing needed to stop him, though they were taken down by the Dijinn one by one.

The pirates try to break Jay through different methods after capturing him to make him use his final wish but failed every time. Even after the rescue, both Jay and Nya were the only ones left and went into hiding in order to organize their plans, though Jay was shaken over the loss of their comrades. During their last confrontation, Jay was pushed into the portal made by Traveler's Tea and Nya was captured. Jay gathers a team to help him to save his comrades, though he was unable to save Nya in time.

Fortunately, Nya helped Jay to get the sword to save his friends and they crashed the wedding. Jay manages to make a final wish that all of the events transpired should not happen in the first place, mourning over the loss of Nya. Due to the venom and the purity of the wish, Nadakhan gave Jay what he wants by reversing time and return back to the point where everything started.

As both Jay and Nya realizes that they were the only ones who remembered the events, both of them embraced and rekindled their relationship, much to the others' confusion over what happened. The reunion of the Lightning and Water Ninja was broadcast all over Ninjago by Dareth. At the same time, Clouse found the teapot, but this time got chased away by the citizens, which fortunately prevented the same events from happening again. At the same time, Yang's Haunted Temple was seen floating in the sky, marking a new future challenge against the Ninja.

On the Day of the Departed, the Ninja hurriedly travel across the Sea of Sand, en-route to the Ninjago Museum of History. Upon their arrival, Wu reminds them of the holiday's significance: for remembering fallen ancestors and cherishing family. Dr. Saunders arrives, greeting Wu and the Ninja before presenting the museum's new exhibit, the Hall of Villainy, which houses life-sized mannequins of the major villains fought by the Ninja over the years, as well as a plaque describing the rare Yin-Yang Lunar Eclipse.

Cole finds a painting of Master Yang, as well as the Yin Blade, which is on display. Cole calls out to Saunders and asks what the weapon is, but realizes nobody is paying attention to him. Cole hears Yang's voice imploring him to "close the circle." Realizing he's fading away as one of the departed, Cole takes the Yin Blade and sets off to face Yang.

The Ninja divide for their own personal memorials: Lloyd and Misako commemorate Garmadon at the Corridor of Elders; Kai and Nya remember their mother and father at their blacksmith shop; Zane remembers his father in Birchwood Forest; Jay spends time with his mom and dad at their junkyard, and Wu goes to the old monastery to remember his father. Realizing everyone is out celebrating, Ronin decides to steal from the deserted houses. Cole arrives at Yang's Temple, which is still floating in the sky. Cole confronts Yang, who he attempts to strike with the Yin Blade but misses, instead of smashing it into an orb. Consequently, the Departed Realm is opened, and the spirits of the Ninjas' old enemies escape while Cole is detained by Yang's students.

The spirits possess five of the six mannequins in the Hall of Villainy, bringing them to life. Speaking through a painting, Yang tells the villains they can remain in Ninjago by slaying the Ninja that defeated them. Pythor then enters the museum and joins the villains as they discuss who to go after. Chen chooses to go after Kai and Nya, Pythor chooses Lloyd, Cryptor chooses Zane, Morro chooses Wu, and Kozu chooses Dareth, which leaves Samukai with facing Jay. Pythor proposes they gather reinforcements from the Hall of Sidekicks to better have the chance of defeating their enemies.

Cole is imprisoned in Yang's temple, where he learns of Yang's history. Yang taught his students to master Airjitzu, and around this time he found the Yin Blade, which contains enough dark magic to imbue immortality. Yang tested the blade on himself, but its powers backfired, turning him and his students into ghosts and defacing his temple. Yang then reveals to Cole that he plans to use the Yin Blade to tear open the Rift of Return to revive himself, while the revived villains distract the Ninja so they won't thwart his plans as Cole realizes his friends are in danger because of him. At that moment, the villains begin their attack on the Ninja all around Ninjago. With help from Eyezor and Zugu, Chen uses his dinosaur mech to attack Kai and Nya, who flee on the Raider Bikes. Cryptor and three Nindroids confront Zane in the snowy forest.

Meanwhile, Samukai fights Jay as Krazi and Frakjaw apprehend his parents, and Pythor fights Lloyd and holds the latter's mother captive. Kozu and several Stone Warriors confront Dareth, who was responsible for taking control of the Stone Army.Wu gets a bad feeling as Morro confronts him, though Wu is pained at having to fight his former student again, he states that he won't hesitate to do it. However, Morro reveals he really has no intention of revenge; instead he tells Wu of Yang's plan and they set off to reunite the Ninja.

Back at the Temple of Airjitzu, Cole breaks free and makes his way up through the temple after escaping his captors, fighting Yang's students along the way as Yang opens the Rift of Return. One by one, the Ninja defeat all the revived villains, except Pythor, who flees after realizing he can't win his fight. In the meantime, Yang does Airjitzu to reach the Rift, but Cole stops him, and a fight breaks out between them.The Ninja reunite at the museum, telling each other what happened before Wu arrives with Morro, who the Ninja prepare to attack but Wu stops them and Morro proves his innocence by unveiling Yang's plan and how the Ninja forgot Cole.

The Ninja journey to Yang's temple while Morro's spirit peacefully returns to the Departed Realm. Cole battles Yang as the Ninja fly over on the Bounty. Yang soon overpowers Cole and mocks him as being another forgotten ghost. However, with his friends approaching and calling out to him, Cole's heightened vigor makes his arms rock-solid, and with them, he shatters the Yin Blade. This act frees Yang's students, who Cole tells to cross through the Rift and after they do they become human again. Yang admits he failed his students and wanted to live forever so no one would forget him, to which Cole says he'll be remembered as the creator of Airjitzu. Together, they ascend towards the Rift, but Yang tells Cole that someone has to remain in the temple as a ghost to be the "master of the house" due to the curse. Yang then decides to settle his own "debts" and launches Cole through the Rift just as it starts to close.

The shockwave of the Rift closing causes Destiny Bounty to have a hard landing at the Airjitzu temple. The Ninja soon start to worry if Cole didn't make it in time as Jay states he'd give anything to have his friend back. At that moment, Cole emerges from behind a rock a human again. The Ninja celebrate the return of their friend before looking at the restored Temple of Airjitzu which Cole suggests they make into their new base.

Not long after, the Ninja and their allies gather around a fire outside of Yang's temple after Cole told the story. Jay asks him if he was going to tell the story every time the holiday comes to which Cole replies only if Jay admits he was scared the temple was still haunted to which the latter states that were the case but says he was wrong as there are no more ghosts. Cole confirms this while looking back to the temple and winks at Yang, who stands inside and winks back in return.

Acronix, one of the Hands of Time, passes through a time vortex and is challenged to a fight by Master Wu. After the arrival of the Forward Time Blade, Acronix hits Wu with a Time Punch which accelerates his aging one day per hour. Even with the intervention of the Ninja, Acronix escapes and reunites with his brother Krux. Now the two Hands of Time have a plan that could change history and revert Ninjago back to its old-fashioned roots. They control an army of Serpentine known as Vermillion, from the eggs of the Great Devourer, who can form into Samurai using metal. The Vermillion began capturing Ninjago builders, including Cyrus Borg, and stealing metal. All to build the Iron Doom, which can travel time, using the Time Apparatus to utilize all four Time Blades. With Master Wu unable to fight, P.I.X.A.L. offline, three other Time Blades scattered throughout time, and a mysterious new Samurai X to learn the identity of, Lloyd leads the team to stop the Time Twins and save Master Wu. The adventure soon proves personal to Kai and Nya, when it turns out their parents could have ties to the villains.

One year after Wu and the Hands of Time were lost in time aboard the Iron Doom, the Ninja have scattered across Ninjago, tackling missions while searching for their master's whereabouts. In their absence, Ninjago City has been overrun by a cult-like crime syndicate known as the Sons of Garmadon who worship the evil Lord Garmadon. When a mysterious relic known as the Oni Mask of Vengeance is stolen from Borg Industries, the Ninja are summoned by the Royal Family, who ask the heroes to protect the three Oni Masks (The Oni Mask of Deception, the Oni Mask of Vengeance, and the Oni Mask of Hatred), relics from the First Realm which when united would allow the Sons of Garmadon to resurrect a purely evil Garmadon, as well as their adopted daughter, the Jade Princess Harumi.

In order to stop the Sons of Garmadon from desecrating his father's sacrifice, Lloyd and the Ninja attempt to find the identity of their leader, the Quiet One. They attempt to determine the location of the elusive Oni Mask of Hatred, while learning secrets about the origins of Ninjago itself. In the process, Lloyd begins to bond with Harumi who has also lost her parents. But as they grow closer, the Ninja make the startling discovery that Harumi is the Quiet One.

With Emperor Garmadon in ruling Ninjago City with an iron fist and the original four Ninja as well as Wu are stranded in Realm of Oni and Dragons after the Colossus destroyed the Destiny's Bounty, any ally of the Ninja and citizen is hunted and imprisoned in Kryptarium Prison. Lloyd, Nya, and the rest of their remaining allies, including a portion of the Elemental Masters, form a resistance to endure and fight back against Harumi, the Sons of Garmadon, and Lord Garmadon himself. Unbeknownst to them, the other Ninja are alive and thanks to Mistaké's Traveler's Tea, they are in the Realm of the Oni and the Dragon. Here, the barbaric Dragon Hunters, led by the power hungry Iron Baron, capture Dragons and exploit their Elemental Powers to sustain their society. As Dragons are the only beings who can ferry between Realms, the Ninja and a teenage Wu must find the mythical Dragon Armor once worn by the First Spinjitzu Master himself, in order to convince Firstbourne, the mother of all Dragons, to allow them to ride her children out of the Realm so they can rejoin the fight against Lord Garmadon, and save Ninjago.

Shortly after Lord Garmadon's defeat, Ninjago is slowly returning to normal. However, Garmadon calls out to Lloyd to warn him about some dark forces that will soon conquer Ninjago, although Lloyd refuses to listen, believing that his father can't be trusted. Garmadon's warnings soon come true when the Oni invade Ninjago through the Realm Crystal and prove too much for the Ninja to handle. With no other choice, the Ninja form an uneasy alliance with Garmadon to defeat the Oni and save Ninjago from darkness. Will they prevail or will the legacy of Ninjago be lost forever?

Six months after they defeated the Oni, the Ninja have become relaxed, lazy, and out of shape. In order to keep their skills and powers intact, they search for activity or a threat to face. Strangely enough, Ninjago has been in a state of lasting peace. However, Zane begins suffering odd visions of him being killed by Aspheera, Queen of the evil Pyro Vipers, as well as a mysterious castle guarded by the dragon Boreal and home to the Ice Emperor and his Blizzard Samurai. While Zane remains unsure about these frightening visions, the Ninja find their quest when Professor Clutch Powers discovers a mysterious Ancient Pyramid which supposedly only a Ninja could survive exploring.

The next threat to Ninjago is close, as the tomb serves as a prison for Aspheera. After she is unwittingly released by the Ninja, she steals Kai's powers and uses them to revive her army of Pyro Vipers, preparing to conquer Ninjago and exact revenge on somebody who betrayed her thousands of years ago. The Ninja are left trapped in the pyramid, but are eventually rescued by P.I.X.A.L., and attempt to stop Aspheera's campaign of conquest. The Ninja soon learn about the Scrolls of Forbidden Spinjitzu, which grant the user great powers, but can also corrupt them, as well as that Wu is the one that Aspheera is looking for, as he befriended her back when they were children and taught her Spinjitzu, but she betrayed him and used it for evil, taking over the Serpentine, leading to Wu and Garmadon defeating Aspheera using Forbidden Spinjitzu and imprisoning her inside the pyramid.

After Aspheera steals one of the two Scrolls of Forbidden Spinjitzu from the museum, the Ninja go after the other, just as Aspheera and her forces attack the Monastery of Spinjitzu. Using the second scroll, the Ninja defeat Aspheera, but Zane is hit with a spell aimed at Wu and gets transported to the Never-Realm. Wu volunteers to go to the Never-Realm on his own and rescue Zane, but the Ninja overpower him and go there themselves, before Wu could warn them that there is no way of return.

The Ninja arrive in the Never-Realm and are brought to a village where they reveal their agenda and help the locals fend off the Blizzard Samurai, led by the mysterious Ice Emperor and his right-hand man Vex. The Ninja believe that Zane was captured by the Ice Emperor and decide to stay at the village, where Kai unsuccessfully attempts to regain his powers, Cole leaves to find the Traveler's Tree in order to collect some leaves for the Traveler's Tea that would help them get back home, along the way befriending Krag, the last survivor of the Yeti species (as they were all slaughtered by the Blizzard Samurai), and Lloyd leaves to find Zane's mech. Along the way, he befriends a Formling named Akita, who can transform into a wolf and wishes to exact revenge on the Ice Emperor for freezing her people.

Meanwhile, the village is attacked by the Ice Emperor's dragon Boreal, forcing the remaining Ninja to flee and continue their journey. Lloyd and Akita are later attacked by Boreal as well, who kidnaps Lloyd and takes him to the Ice Emperor, revealed to be none other than Zane: after being banished to the Never-Realm years ago (as he was sent 60 years into the past), he lost his memory and was manipulated by Vex, a Formling who wished to exact revenge on his people for mocking him due to not being able to change his form. Zane was convinced that he was the Ice Emperor, the rightful ruler of the Never-Realm and the two of them then dethroned the true ruler of the realm, Grimfax. Zane used the Scroll of Forbidden Spinjitzu to corrupt Grimfax's warriors, turning them into the Blizzard Warriors, later also freezing the Formlings and massacring the Yetis. Lloyd tries to get Zane to remember who he truly was, but fails, as the scroll corrupted him as well.

Lloyd is locked up, where he meets Akita's brother Kataru. The two soon form and alliance with Grimfax (who became the commander within the Blizzard Samurai army after being forced to work for Zane by Vex) to dethrone Zane and liberate the Never-Realm. Eventually, Kai recovers his powers, destroying Boreal, and Zane recovers his all of his memories after Vex attempts to kill Lloyd. Zane stops him, before destroying the scepter to undo the effects of the Forbidden Scroll and restore peace to the Never-Realm. Afterwards, Grimfax becomes King of the Never-Realm once again, Vex is banished for his crimes, and all the Ninja say goodbye to their newfound friends and allies, returning home in Ninjago.

When the old, legendary video-game "Prime Empire” resurfaces, Players begin to disappear. Jay loves games, but after playing "Prime Empire", he too enters the game. The other Ninja soon find out that the creator of the "Prime Empire" has disappeared as well, and nobody has seen him in many years. They discover that the creator's name is Milton Dyer. With the suspicion that Dyer is actually Unagami, most of the Ninja enter the game so they can stop his avatar, while Zane and P.I.X.A.L. remain outside to find Dyer in the real world.

The ninja are invited to the beautiful Shintaro Kingdom to celebrate the young Princess Vania’s birthday. At first glance, the Ivory City looks like a pristine place, but the ninja soon uncover a dark, obscure, long-forgotten underworld: The Dungeons of Shintaro. Once inside, they must fight their way to freedom through a maze of tunnels paved with dangers and strange creatures ruled by the merciless Skull Sorcerer. The ninja must choose their path wisely… get ready to go deep underground.

• Lloyd Montgomery Garmadon (voiced by Jillian Michaels in seasons 1–7 and Sam Vincent in seasons 8-present) – The Green Ninja and Elemental Master of Energy. The current leader of the Ninja, son of Garmadon and Misako, nephew of Master Wu, and the grandson of the First Spinjitzu Master. He frequently wields either a sword or dual swords.[3] Lloyd's powers are vaguely defined, a fact admitted by his friends, but he possesses the ability to manipulate green energy and passively shield his body. Lloyd made his debut in Season 1 as a mischievous child wanting to be an evil warlord just like his father. This resulted in childish schemes that were often foiled by the original four Ninja. Lloyd was eventually captured and reformed by the Ninja and Master Wu, Lloyd's paternal uncle, and eventually discovered his destiny as the Green Ninja. While initially mischievous and naive, Lloyd has been tempered by experience and time into a mature and capable ninja. Though still the youngest, he has emerged as the natural leader of the Ninja, displaying wisdom beyond his years. Lloyd greatly appreciates his friends, saying that it was them who taught him the "importance of being brave, of being strong, and most importantly, being good". He believes the team's strength comes from "no one being more important than the other". Though he can still be rash in matters of family (especially regarding his father) there are few more dedicated and determined to protecting their friends and Ninjago.
• Kai (voiced by Vincent Tong) – The Red Ninja and Elemental Master of Fire. Like Lloyd, he frequently wields either a sword or dual swords. His elemental power grants him limited pyrokinesis and fire immunity. Kai is fiercely loyal to his friends and family, often willing to do anything to ensure their safety. He often acts on emotion instead of reason, causing him to be hotheaded, cocky, and rash. He also has a strong sense of responsibility, feeling enormous guilt in situations where his friends suffer, such as when Zane sacrificed himself and when Lloyd was possessed. Kai is the elder brother of Nya and son of Ray and Maya.
• Jay Walker (born Jay Gordon) (voiced by Michael Adamthwaite) – The Blue Ninja and Elemental Master of Lightning. He frequently wields nunchucks and more recently, a kusarigama. His elemental power grants him limited electricity manipulation. He is also a skilled mechanic and technologically savvy. Jay is inventive and quick-witted, often using comedy to alleviate stressful situations. He is easily excitable and prone to freaking out when in crises but like the other Ninja is intensely loyal to his friends, especially his girlfriend Nya. He is the son of Cliff and Libber Gordon (Libber is revealed to be the original Elemental Master of Lightning) and was adopted and raised by Ed and Edna Walker.
• Zane (voiced by Brent Miller) – The White/Titanium Ninja and Elemental Master of Ice. He frequently wields three-pointed shuriken and, more recently, a bow and arrows. His elemental power grants him limited cryokinesis. Zane is intelligent and calculating, often providing intel to the other ninja as it applies to their situation. Initially, he lacked normal social skills. It was later revealed that this was due to Zane secretly being a nindroid, a fact unknown to both the Ninja and Zane himself. Though he is still logical and matter-of-fact, his brotherhood with the other Ninja have enabled him to pick up more human characteristics such as humor. He is the son/creation of Dr. Julien.
• Cole (voiced by Kirby Morrow) – The grounded and solid Black Ninja and Elemental Master of Earth. He frequently wields a scythe and, in recent additions to the series, a war hammer. His elemental power grants him limited earth manipulation and super strength. The original leader of the Ninja, he is very loyal to his friends and family and has a special love for food, especially cake.
• Nya (voiced by Kelly Metzger) – The Silver/Maroon Ninja, Elemental Master of Water, and original Samurai X. She frequently wields a sword and, more recently, a spear. Her elemental power grants her hydrokinesis. Originally not a part of the Ninja team, Nya joined when her skills as an elemental master of water were needed to combat the threat of the ghost. Tough and determined, she refuses to let anyone tell her what to do. Though she can sometimes be stubborn, Nya true does care about her friends and family often making the most mature decisions of the group and serving as emotional support. A skilled mechanic, she often constructs vehicles for the other Ninja. Nya is Kai's younger sister, daughter of Ray and Maya, and girlfriend of Jay.
• P.I.X.A.L. (Primary Interactive X-ternal Assistant Life-form) (voiced by Jennifer Hayward) – A female Nindroid who was originally an assistant to her creator/father Cyrus Borg. She joined the Ninja's team after being influenced by her fellow robot Zane. She was disassembled in season 4 but then uploaded into Zane's systems as an artificial intelligence system. In season 7, she secretly rebuilt herself and became the new Samurai X. She often provides technical support to the Ninja while serving as Zane's love interest.
• Sensei/Master Wu (voiced by Paul Dobson, Caleb Skeris as a baby, Madyx Whiteway as a child) – The wise, old master of the Ninja who frequently wields his father's staff. He is Lloyd's uncle, younger son of the First Spinjitzu Master, and brother to Garmadon. Because of his Oni and Dragon heritage, Wu has lived for over a thousand years and has the power to create and manipulate matter.
• Lord/Sensei/Master/Emperor Garmadon (voiced by Mark Oliver, Kai Emmett as a child) – Lloyd's father, Wu's older brother, and elder son of the First Spinjitzu Master. Garmadon was a main antagonist for the first two seasons but was later cleansed of evil and became a Sensei to the Ninja. In season 4 he was sacrificed to the Cursed Realm to stop Master Chen's Anacondrai Army. Garmadon was revived in season 8 by the Sons of Garmadon as a being of pure evil and proceeded to conquer all of Ninjago and proclaimed himself as the Realm's new Emperor. However at the end of season 9, Garmadon's reign of terror was finally brought to an end and he and the Sons of Garmadon were all arrested and locked up in Kryptarium Prison. In season 10, he was released to help the Ninja defeat the Oni, after which he left to an unknown part of Ninjago. Because of his Oni and Dragon heritage, Garmadon has lived for over a thousand years and possesses the ability to destroy matter.

• Dareth (voiced by Alan Marriott) – The bumbling self-proclaimed "Brown Ninja" and Grand Sensei of Dareth's Mojo Dojo. He is a frequent ally of the Ninja both by choice and coincidence.
• Mistaké (voiced by Mackenzie Gray Seasons 1–2, Mark Oliver Season 4, Tabitha St. Germain Seasons 8–9) – An often grouchy old lady who is old friends with Master Wu. She owns a tea shop that sells rare tea with magical properties. In season 9, she revealed to securely be an Oni in disguise. In the same season, it is implied that she was killed by Garmadon.
• Cyrus Borg (voiced by Lee Tockar) – A tech genius and head of Borg Industries, he is the creator/father of P.I.X.A.L. who has invented all sorts of cutting edge electronic tools and gadgets. He first sought out the Ninja after the Digital Overlord overtook his systems and has built a variety of tools, security systems, machines, and vehicles to assist the Ninja.In season 3, the Overlord often turned him evil.
• Ronin (voiced by Brian Dobson) – A mercenary motivated by self-interest who will assist the Ninja if it suits his needs.
• Police Commissioner (voiced by Michael Donovan) – The head of Ninjago police, he was originally introduced in season six as an antagonist who pursued the Ninja when they were framed for committing various crimes. Since the Ninja were proved innocent, however, he has assisted them both personally and with the full backing of the police force

• First Spinjitzu Master (voiced by Jim Conrad) - The Inventor of Spinjitzu, father of Wu and Garmadon, father-in-law of Misako and grandfather of Lloyd. Originally from the Realm of Oni and Dragon, he created the realm of Ninjago and fought the Overlord to a standstill. He died long before the start of the series.
• Misako (voiced by Kathleen Barr) – Garmadon's wife, First Spinjitzu Master's daughter-in-law, Wu's sister-in-law, and Lloyd's mother. Misako is an archaeologist.
• Dr. Julien (voiced by Mark Oliver) – An inventor and the creator/father of Zane and Echo Zane. Zane presumed that he was dead until Dr. Julien revealed that Samukai revived him and imprisoned him. He briefly joins the Ninja when they find him at a lighthouse, and died sometime between seasons 2 and 3.
• Ed Walker (voiced by Colin Murdock) – The adoptive father of Jay and the husband of Edna Walker, as well as the co-owner of Ed & Edna's Scrap N Junk.
• Edna Walker (voiced by Jillian Michaels) – The adoptive mother of Jay and the wife of Ed Walker, as well as the co-owner of Ed & Edna's Scrap N Junk.
• Lou (voiced by Kirby Morrow) – Cole's father Lilly's husband and notable member of the Royal Blacksmiths, a famous song and dance troupe.
• Ray (voiced by Vincent Tong) – Kai and Nya's Father, Maya's husband and former Elemental Master of Fire. He previously fought alongside his wife under Masters Wu and Garmadon as part of the First Elemental Alliance during the First Serpentine War. He is a skilled blacksmith.
• Maya (voiced by Jillian Michaels) – Kai and Nya's mother Ray's wife and former Elemental Master of Water. She previously fought alongside her husband under Masters Wu and Garmadon as part of the First Elemental Alliance during the First Serpentine War.
• Libber (voiced by Kelly Metzger) - Jay's mother Cliff Gordon's wife and former Elemental Master of Lightning, whose name was given behind the scenes by Andreasen. She confirms her relationship with Cliff Gordon in Season 7.
• Lilly - Cole's unseen mother Lou's wife and master of Earth after her unnamed father. She has unknown affiliation with the Skull Sorcerer and is presumed deceased after she inherited her powers to her son. It is unknown if she betrays him joins the Ninja and reunited with her son and husband.

The Skulkin are a breed of living skeletons who were once ruled by Samukai. After becoming their leader, Garmadon sent the Skulkin to Ninjago to find the Four Golden Weapons of Spinjitzu, to which they do so. The Skulkin are defeated by the Ninja, though Samukai tries to use the Weapons himself. The power of the weapons destroys him, allowing Garmadon to escape his imprisonment and leaving the Skulkin leaderless. However, Garmadon rebands the Skulkin and leads them to rescue the Ninja and help them steal the Fang Blades from the Serpentine, as part of the temporary alliance Garmadon made with the Ninja to stop the Serpentine's leader Pythor from unleashing the Great Devourer, the very same giant snake who turned Garmadon evil. The Skulkin are willing to help along with this because, as Kruncha comments "Everybody hates snakes."

• Samukai (voiced by Michael Kopsa) – The four-armed Skulkin Ruler of the Underworld until Lord Garmadon defeated him in single combat and took over. He led the attacks on Ninjago, sent by Garmadon to retrieve the four Golden Weapons. He attempted to betray Garmadon by keeping the weapons for himself but, unable to control the power of the four golden weapons at once, was instead overloaded with power and killed. His body created a portal to another realm with Garmadon traveled though to amass more power. He temporarily returned on the Day of the Departed seeking revenge on Jay.
• Kruncha (voiced by Brian Drummond) – A brutish Skulkin General who served under Samukai and was part of the raids to retrieve the Golden Weapons. After the Skulkin's defeat, he found himself roaming Ninjago and taking odd jobs with Nuckal.
• Nuckal (voiced by Brian Drummond) – A crazy Skulkin General. He served under Samukai and was part of the raids to retrieve the Golden Weapons. After the Skulkin's defeat, he found himself roaming Ninjago and taking odd jobs with Kruncha.
• Wyplash (voiced by Michael Dobson) – A paranoid Skulkin General. Unlike Samukai, Kruncha, and Nuckal, he was not part of the Golden Weapon raids. After the Skulkin were defeated, he attempted to ambush Nya but was soundly beaten by the lone warrior.

The Serpentine are a warrior race of humanoid serpents. Originally a race created by the First Spinjitzu Master, they held a prophecy that foretold the coming of the Golden Master. Their attempts to warn the humans resulted in a war that culminated with them being driven underground, partly because both sides were manipulated by Master Chen. Released by Lloyd Garmadon, the Serpentine attempted to conquer Ninjago several times under the leadership of Pythor, Lord Garmadon, and finally Skales. However, after losing in battle to the Overlord's Stone Army, the Serpentine made a home for themselves underground and later aid the people of New Ninjago City escape the Golden Master's attack and then against Master Chen's army of fake Anacondrai. The Serpentine tribes, according to one of the show's creators Tommy Andreason, may have been transported from Chima.

• The Great Devourer – A giant snake worshipped as a goddess by the Serpentine, known to be very dangerous and deadly with the ability to increase its size by consuming anything in its path, including its own kind. The Great Devourer is the main cause of the events in the series as it was responsible for turning Garmadon evil through its venom, and it was the Anacondrai General Pythor intended to release to exact revenge on the people of Ninjago. But the Great Devourer proved to be beyond anyone's control, swallowing Pythor and Sensei Wu alive, the former suffering side effects from exposure to the serpent's stomach acid, and running rampant on Ninjago with the Ninja unable to subdue it. However, in the end, the Ninja manages to lure the Devourer into a trap during its siege of Ninjago City, allowing Lord Garmadon to destroy the Great Devourer with the power of the Golden Weapons in revenge for the grief and madness it caused to him. Despite its death, the monster's venom still seeps into Ninjago City's sewage system, eventually reawakening the Stone Army. However, the Stone Army was eventually destroyed, and upon the Overlord Dragon's defeat Garmadon was cleansed of the Devourer's venom and its effects. It is proven to be female in season 7.
• Anacondrai – An honor-bound anaconda-type Serpentine tribe that is the most feared of the Serpentine, able to turn themselves invisible. They are known for their purple coloration, and unlike other Serpentine tribes they all-not just their generals-have snake tails in place of legs. While their leading members were exiled to the Cursed Realm, the rest of the Anacondrai were trapped underground and apparently resorted to cannibalism until only Pythor remained. However, Master Chen and his group of cultists sought to bring them back, using dark magic to become Anacondrai themselves.
  • Pythor P. Chumsworth (voiced by Michael Dobson) – The General and last remaining member of the Anacondrai Tribe and former Snake King of the Serpentine, unique among his kind due to his elongated neck and habit of swallowing people larger than himself. Unlike his kind, Pythor is cowardly and dishonest yet has an arrogant sense of pride. While his tribe were sealed away, the Anacondrai Tribe had no food source and ultimately fell to starvation with Pythor becoming the sole survivor. Upon being released, Pythor pretended to be Lloyd's ally to steal the map to the Serpentine tombs to release the Constrictai and the Venomari Tribes. Soon after finding the lost city of Ouroborus, through deceit and an alliance with Skales, Pythor becomes the first Snake King of all Serpentine. It becomes clear soon that Pythor had been driven insane by his imprisonment and his hatred of the surface dwellers, using the allegiance of the tribes to unleash the Great Devourer to exact revenge on people of Ninjago for locking up the Serpentine underground. As the series progressed, Pythor finally managed to collect all four Silver Fang Blades, despite the oppression from the Ninja, Lord Garmadon, and the Skulkin, realizing too late that the Great Devourer would consume everything in its path, including himself alongside Sensei Wu. In season 3, Pythor is revealed to have survived his ordeal within the Great Devourer's stomach with his scales bleached white as he went into hiding. Still bent on revenge against the humans, Pythor aids the Overlord by converting Sensei Wu into Tech Wu and then tricking the ninja into giving him a beacon leading him to Lloyd. This season also revealed a fascination with a breed of electric eel/water snake known as electrocobrai, which he used as a power source for the Overlord and his creations. He swallows the shrinking pill that was meant for the Overlord in "The Titanium Ninja" and is chased by the Falcon. In season four he is among the many inmates of Kryptarium Prison-living in a dollhouse inside of a cell-and reveals to the ninja that the Anacondrai were tricked into attacking the humans during the war. He is captured by Chen and his sweat is used to make the Fake Anacondrai permanent, but he manages to discover a means of defeating them by releasing the spirits of the Anacondrai Generals. In gratitude for finally making them proud, Arcturus restores Pythor to his original size, though not his former coloration. He appears to be fond of the name "Rodrigo", as he applied this name to a toy basketball he owned while in prison and a rat that he tamed and rode into the final battle with the Anacondrai Cult.
  • General Arcturus (voiced by Scott McNeil) – General and leader of the Anacondrai Tribe and Supreme Leader of the Serpentine during the First Serpentine War. He and the other Anacondrai generals were banished to the Cursed Realm after being defeated by the Elemental Alliance. The ghosts of the Anacondrai generals were later freed in order to defeat Chen's Anacondrai Cultist Army.
• Hypnobrai – A cobra-type Serpentine tribe that specializes in mind-control. They were locked in a frozen tomb in a tundra. All of them have red eyes they use to hypnotize victims (which explains that their name is a pun on "Hypnotize"). The symbol of the staff and the Hypnobrai has a hypnotizing shape like a swirl. Their color is blue.
  • Skales (voiced by Ian James Corlett) - Leader and general of the Hypnobrai Tribe and current Snake King of Serpentine following the perceived death of Pythor. Originally ranked a warrior, Skales became general after challenging and defeating then general Slithraa. After being defeated time and time again by the Ninja he and the rest of the Serpentine found themselves trapped underground by the Stone Army. The Serpentine then reformed, took an oath of pacifism, and began to live peacefully alongside the other inhabitants of Ninjago. Skales settled down, started a family, and has assisted the Ninja in matters relating to snakes. Like all Hypnobrai, Skales can hypnotize his foes if they stare into his eyes. He is also a master of the ancient art of Fang-kwon-do.
  • Slithraa (voiced by John Novak) – The former leader and general of the Hypnobrai Tribe. After accidentally hypnotizing himself, he became a servant to Lloyd Garmadon and led his tribe in accomplishing the childish schemes of the young boy. Frustrated by being ordered around by a boy, Skales saw an opportunity to rise in power. After another failed scheme, Slithraa was challenged by Skales to a match in the Slither Pit for the right to lead the Hypnobrai. Slithraa was subsequently defeated by Skales and demoted to warrior.
• Fangpyre – A pit viper-type Serpentine tribe who specializes in venomous bites that transform the victim into a Serpentine (depending on their element) with snake-like traits. Strangely if a Fangpyre bites a vehicle, it transforms instantly. But if they bite a person, it takes a long time for them to transform (probably because the person's immune system fights the transformation). Their anti-venom, as with the other Serpentine Tribes, is located inside the staff of their tribe. If a Fangpyre bites another Fangpyre, the Fangpyre grows another head, resulting in the slightly comedic quirk that each head speaks halves or thirds of a sentence if it is long enough. The sign of the staff and the Fangpyre are fangs with a snake tongue sticking out.
  • Fangtom (voiced by Mackenzie Gray) – The two-headed leader and General of the Fangpyre Tribe. He is old friends with Skales and, like all Fangpyre, has the ability to turn anyone or anything into a snake by bitting and injecting them with his poisonous venom.
• Constrictai – A boa constrictor-type Serpentine tribe who specializes in constricting anyone and burrowing underground at a fast speed. They're also the shortest and the dumbest of all Serpentine tribes, but they are second strongest after the Anacondrai. The sign of the staff and the Constrictai is orange and has three rings connecting to each other representing constricting. The anti-venom in the staff awakens those knocked out when being choked. They were sealed within the Mountain of a Million Steps until released by Pythor.
  • Skalidor (voiced by Michael Dobson) – The powerful leader and general of the Constrictai Tribe. Like all Constrictai, Skalidor has the ability to burrow underground and possesses abundant strength.
• Venomari – A spitting cobra-type Serpentine tribe with odd tusks and multiple eyes who specializes in spitting a hallucination-inducing venom. They were sealed in a tomb within the Poisonous Bogs until Pythor released them. The symbol of the staff and the Venomari is green with drops of venom coming out of the symbol.
  • Acidicus (voiced by Paul Dobson) – The intelligent leader and general of the Venomari Tribe. Like all Venomari, Acidicus has the ability to spit venom at his foes which causes fear inducing hallucinations.
• Vermillion – The Vermillion are an artificially created faction by Krux, the spawn of the Great Devourer and masses of snakes coming together to take a single, intelligent humanoid form.
  • Machia (voiced by Kathleen Barr) – The Supreme Commander of the Vermillion Tribe with Gorgon-like hair.
  • Raggmunk (voiced by Michael Adamthwaite) – General of the Vermillion Tribe.
  • Blunck (voiced by Brian Dobson) – General of the Vermillion Tribe.
• Pyro Vipers - A new, original tribe of Serpentine named by Gayle Gossip. They are the reanimated, zombified corpses of the original Serpentine race during the days of the First Spinjitzu Master, who may have evolved into the tribes known during the wars. Joined by the Elemental Cobras and Fire Fang, they're led by Queen Aspheera to wreak havoc on Ninjago, acquire the Forbidden Scroll and banish Master Wu to the Never-Realm. Their fate after attacking the Spinjago Monastery is unknown, but it's possible they were imprisoned in Kryptarium.
  • Aspheera (voiced by Pauline Newstone) - A sorceress of the ancient Serpentine who desired to learn Spinjitzu. In exchange for learning combat, she released Garmadon and Wu from the dungeons after they trespassed on the valley against their father's law. Based on Aspheera's development, she and Wu became friends for the next few months/years, and Wu has her master Spinjitzu. However, she betrays her promise to Wu, to never use Spinjitzu for evil, and overthrows King Mambo with the intention to conquer Ninjago for herself. Garmadon and Wu arm themselves with the Forbidden Scrolls on staffs and defeat Aspheera in the throne room. She blames Wu for not teaching her Forbidden Spinjitzu and turning on her, believing that her actions of mutiny were acceptable. When she's sentenced to magical entombment, she swears vengeance on Wu. Around a thousand years later, Jay and Nya accidentally set her free when the Ninja are exploring the pyramid in the Desert of Doom. It was a vision predicted by Zane since the season's beginning. Aspheera steals Kai's fire powers and revives the mummified Serpentines. She destroys the pyramid, summons an army of cobras and her Fire Fang serpent. She comes to conflict with the Ninja multiple times upon seizing the Forbidden Scroll. She corners Wu, Kai, Jay, and Cole in the Monastery's cave, and fights P.I.X.A.L.'s Titan Mech. The fight is joined by Lloyd, Nya, and Zane, who have found the second Forbidden Scroll. Aspheera is defeated by Zane and locked in Kryptarium Prison in Garmadon's cell, but not before banishing Zane to the forsaken Never-Realm.
  • Char (voiced by Brian Drummond) - Aspheera's second in command, who displays attraction to his mistress and immense loyalty. He behaves like an immature child, which gets on Aspheera's nerves, but serves fiercely to the end.
  • King Mambo The Fifth (voiced by Michael Dobson) - The original king of the Serpentine during the days of the First Spinjitzu Master, who has Garmadon and Wu imprisoned after breaking their truce. He was overthrown by Aspheera but restored to his rightful place on the throne when Wu defeats Aspheera. He then sentences Aspheera to magical entombment as punishment.

• The Overlord (voiced by Scott McNeil) – The Ultimate Evil who fought the First Spinjitzu Master to a draw. Lloyd defeated the Overlord in the Season 2 finale by unlocking his Golden Powers. The Overlord returned in Season 3 as a digital entity who seeped into and took over the technology of New Ninjago City.
• General Kozu (voiced by Paul Dobson) – The four-armed general of the Overlord's Stone Army. He is the only member of the Stone Army that can speak English.
• General Cryptor (voiced by Richard Newman) – The general of the Overlord's Nindroid Army.
• Min-Droid (voiced by Michael Adamthwaite) – A member of the Nindroid Army who is shorter the rest of his robotic brethren because the factory that produced him ran out of metal. He is highly sensitive about his size and teasing at the hands of the other Nindroids (especially Cryptor) have given him a short-tempered and vicious disposition. Despite his size, he is actually a capable and observant fighter.

• Master Chen (voiced by Ian James Corlett) – Skylor's father and leader of the Anacondrai Cultists. He was exiled to an island after allying himself with the Serpentine and betraying humanity during the first Serpentine War. He later attempted to steal the powers of the elemental masters to transform him and his followers into powerful Anacondrai warriors to conquer Ninjago but was defeated and banished to the Cursed Realm. Chen was destroyed when the Preeminent was dropped into the ocean. He was later resurrected by Yang seeking revenge on Kai and Nya.
• Clouse (voiced by Scott McNeil) – A dark sorcerer and Chen's right-hand man. He and Garmadon previously trained under Master Chen before the First Serpentine War. He was sent to the Cursed Realm after being defeated by Garmadon, but escaped the realm before its destruction. After the reversal of Season 6, he fails to release Nadakhan from captivity but releases his crew to serve him and bring doom to Ninjago on the Dark Island. Wu turns Clouse's spell against him and banishes him to the Underworld where he is currently imprisoned.
• Eyezor (voiced by Michael Donovan) – A smug and aggressive one-eyed general of Chen's cult. He oversaw transportation of goods from the noodle factory to Chen's off island noodle house.
• Zugu (voiced by Brian Dobson) – A hulking and immovable general of Chen's cult. He oversaw production of goods in Chen's noodle factory as well as the prisoners who were forced to make them.
• Kapau (voiced by Alessandro Juliani) – A comical cultist. Never seen without Chope.
• Chope (voiced by Ian Hanlin) – A comical cultist. Never seen without Kapau.

• Skylor Chen (voiced by Heather Doerksen) – The Elemental Master of Amber and Master Chen's daughter. She has the ability to copy other elemental powers. She originally operated as a spy for her father and was tasked with disrupting the Ninja and their alliance. Though she helped her father steal the elemental powers of the other masters, Kai convinced her to switch sides and she ultimately betrayed Chen and helped to return the stolen elemental powers. It is revealed by Chen that Skylor inherited her powers of Amber from her mother. She has reappeared as an ally of the Ninja and romantic interest of Kai.
• Karlof (voiced by Scott McNeil) – The Elemental Master of Metal and engineer from Metalonia. He has the ability to turn his entire body into metal and grow slightly in size.
• Griffin Turner (voiced by Doron Bell) – The Elemental Master of Speed. He has the ability to move at super speeds.
• Shade (voiced by Andrew Francis) – Also known as Shadow, the Elemental Master of Shadow. He has the ability to disappear and move in shadows.
• Neuro (voiced by Paul Dobson) – The Elemental Master of Mind. He has the ability to read minds and manipulate thoughts.
• Paleman (voiced by Kirby Morrow) – Also known as Mr. Pale, the Elemental Master of Light. He has the ability to generate light and turn invisible.
• Tox (voiced by Ian James Corlett in Season 4, Maggie Blue O'Hara in Season 9) – The Elemental Master of Poison who is capable of producing toxic clouds.
• Jacob Pevsner (voiced by Paul Dobson) – The blind Elemental Master of Sound, who wields a guitar in combat and has the ability to manipulate sounds.
• Bolobo (voiced by Michael Adamthwaite) – The Elemental Master of Nature. He has the ability to control plants.
• Chamille (voiced by Maryke Hendrikse) – The Elemental Master of Form. She has the ability to shapeshift.
• Ash (voiced by Brent Miller) – The Elemental Master of Smoke. He has the ability to create smokescreens and transform into smoke.
• Gravis (voiced by Kirby Morrow in episode 37, Mark Oliver in all other appearances) – The Elemental Master of Gravity. He has the ability to levitate and alter gravity.
• Krux (voiced by Michael Daingerfield) – One of the co-Elemental Masters of Time and Hand of Time along with his twin brother Acronix. He originally disguised himself as the museum curator Dr. Sander Saunders until his true identity was revealed. He had the ability to pause and reverse time.
• Acronix (voiced by Ian Hanlin) – One of the co-Elemental Masters of Time and Hand of Time along with his twin brother Krux. He had the ability to speed up and slow down time.

A faction of cursed, corrupted spirits associated with Morro and summoned by him from the Cursed Realm through the use of the Allied Armor of Azure. The spirits of the Cursed Realm appear to have elemental abilities to transform and possess objects and organisms. As ghosts they are immune to most forms of physical attack, but are vulnerable to water as it is ever changing, which can cause them to dissolve into ectoplasm. Their only other vulnerability is to Deepstone, a substance mined from beneath the ocean floor, which can either contain them or be forged into weapons for use against them, such as the Aeroblades the ninja obtain from Ronin. While Morro leads the group in the field, their true master is the Preeminent, Queen and embodiment of the Cursed Realm.

• The Preeminent – The embodiment of the Cursed Realm and the master of Morro and the Ghost Warriors. Her ultimate goal is to retrieve the Realm Crystal from the Tomb of the First Spinjitzu Master and assure in her arrival to curse all 16 Realms, including Ninjago. She resembles a massive eyeball with tentacles. Though her minions allowed her to cross into Ninjago, she was defeated when the Ninja and their allies dropped her into the ocean.
• Morro (voiced by Michael Dobson in episode 44, Andrew Francis from 45 onward) – The Elemental Master of Wind and leader of the Ghost Army who has the power to control air and wind. A former pupil and student of Master Wu who was believed to be the legendary Green Ninja. When the Golden Weapons did not react to Morro (proving that he was not destined to be the Green Ninja), he was enraged and left Master Wu's care, determined to prove destiny wrong. He was eventually banished to the Cursed Realm and returned as a ghost. The envious Morro then possessed Lloyd and simultaneously schemed to both unleash his new master, the Preeminent, and steal the mantle of Green Ninja from Lloyd. He was killed while being dragged into water by the Preeminent. During Day of the Departed, he is resurrected by Yang and possesses a statue of himself. The resurrected villain picks Wu as his target, since they left things unsettled. However, it is revealed that this was a ploy and it is shown he has learned his lesson because he instead warns the old master and his pupil about Yang's plan. With his mission accomplished, he is thanked by Wu and he bids his former mentor farewell before going back to the Departed Realm.
• Bow Master Soul Archer (voiced by Brian Dobson) – Morro's Second-In-Command and a Ghost Warrior who wields a bow and arrows that can turn its targets into ghosts. He once won a bet with Ronin and seeks to collect.
• Chain Master Wrayth (voiced by Michael Adamthwaite) – A tough ghost warrior who wields a chained whip that can turn its targets into ghosts. He rides a transformed bike, similar to Marvel's Ghost Rider.
• Scythe Master Ghoultar (voiced by Paul Dobson) – A dimwitted ghost warrior who wields a scythe. He is often distracted by food.
• Blade Master Bansha (voiced by Kathleen Barr) – A ghost and dark sorceress who wields a double-bladed dagger. She had telepathic powers, the ability to create sonic screams, and can possess targets from a great distance.
• Sensei/Master Kodokuna Yang (voiced by Michael Donovan) – The Creator of Airjitzu and current guardian of the temple on Haunted Hill. He accidentally turned himself, his students, and his temple into ghosts or ghost-filled places after arrogantly attempting to use the Yin Blade to gain immortality.

The Sky Pirates are a motley crew of renegades who are led by Nadakhan, a Djinn from Kingdom of Djinjago.

• Nadakhan (voiced by Scott McNeil) – Djinn leader of the Sky Pirates and captain of Misfortune's Keep. He can grant three wishes to anyone within earshot.
• Flintlocke (voiced by Paul Dobson) – Nadakhan's mustachioed second-in-command who dresses like an old-time aviator and is known for never missing a shot.
• Dogshank (voiced by Nicole Oliver) – A massive pirate who wears a helmet that conceals most of her head.
• Doubloon (voiced by Vincent Tong) – A sinister looking general who resembles a Japanese demon in Samurai armor.
• Monkey Wretch (voiced by Ian James Corlett) – A fierce mechanical monkey.
• Clancee (voiced by Ian James Corlett) – A Green Serpentine with a right peg leg who is constantly stuttering.
• Squiffy (voiced by Michael Adamthwaite) – A human who wears a patch over his right eye. His real name is Landon.
• Bucko (voiced by Brian Dobson) – A human who wears a patch over his left eye. His real name is Colin.

• Princess Harumi (voiced by Britt McKillip) – Also known as the Jade Princess, the Quiet One, and her nickname Rumi. She was adopted by the Emperor and Empress of Ninjago after her parents were killed in the destruction of the Great Devourer. Blaming the Ninja for her parents' deaths she accordingly idolized Garmadon after he defeated the Devourer. She secretly created and led the Sons of Garmadon (a criminal biker gang) to uncover the three Oni Masks in order to resurrect Garmadon and exact revenge on the Ninja. As part of her plan, she orchestrated an attack on the royal palace to capture the Oni Mask of Deception which resulted in her adoptive parents' deaths. She then gained the Ninja's trust by exploiting their sympathy for her adoptive parents' deaths and pretended to be in love with Lloyd, who promised to protect her from the Sons of Garmadon. Harumi then successfully used the Ninja's protection as a cover to locate and acquire the Oni Mask of Hatred. Though the Ninja eventually discovered she was the Quiet One, they did not succeed in preventing the resurrection of Lord Garmadon, resulting in the fall of Ninjago. She and the Sons of Garmadon ruled Ninjago as underlings of Lord Garmadon and assisted him in hunting down the remaining Ninja and members of the resistance. During the a battle between Skylor and Garmadon over the control of the Colossus, The former Jade Princess redeems herself by helping a family escape a collapsing building, which she later perishes in, enduring the same fate as her parents.
• Mr. E (voiced by Brent Miller) – The silent and robotic third general of the Sons of Garmadon. Also known as the Man in the Green Mask, he and five other members stole the Oni Mask of Vengeance. He frequently wore the Oni Mask of Vengeance. He was later destroyed by Emperor Garmadon for failing to capture Lloyd.
• Ultra Violet (voiced by Maggie Blue O'Hara (Seasons 8-9), Sharon Alexander (Season 11-onward) – The unhinged second general of the Sons of Garmadon. She frequently wears the Oni Mask of Hatred, sharing it with Harumi. She despises Zane the most of all the Ninja.
• Killow (voiced by Garry Chalk) – The hulking first general of the Sons of Garmadon. Also known as the Big Man. He frequently wears the Oni Mask of Deception.
• Luke Cunningham (voiced by Michael Adamthwaite) – An avid biker. Also known as the Man in the White Mask, Luke and four other members accompanied Mr. E in the theft of the Oni Mask of Vengeance. He was arrested and later interrogated by the Ninja, where he accidentally revealed the location of the Sons of Garmadon.
• Chopper Maroon (voiced by Sam Vincent) – A regular biker. Frequently seen with Mohawk.
• Mohawk (voiced by Vincent Tong) – A regular biker. Frequently seen with Chopper Maroon.

• Iron Baron (voiced by Brian Drummond) – The authoritarian leader of the Dragon Hunters. He sought revenge on the Firstbourne but was ultimately killed by her after attempting to wear the Dragon Armor.
• Faith (voiced by Kathleen Barr) – Also known as Heavy Metal, Faith is Iron Baron's second-in-command and original wielder of the Dragonbone Blade. She was the first Hunter to defect upon discovering Wu is a son of the First Spinjitzu Master, destined to look for the Dragon Armor. Following Iron Baron's death, she takes over as leader of the Dragon Hunters.
• Daddy No Legs (voiced by Ian James Corlett) – A Dragon Hunter who has no legs and uses a spider-leg apparatus to get around.
• Muzzle (voiced by Brent Miller) – The right-hand man to Daddy No Legs. He speaks in a language only the Dragon Hunters can understand.
• Jet Jack (voiced by Rhona Rees) – The former rival and current second-in-command of Heavy Metal. She is never without a jetpack.
• Chew Toy (voiced by Scott McNeil) – An overweight and mentally unstable Dragon Hunter.
• Arkade (voiced by Michael Donovan) – An almost living arcade, with arcade functions on his frontside.
• Scar (voiced by Michael Adamthwaite) – A Dragon Hunter who calls himself "Scar the Skullbreaker."

• The Omega (voiced by Zach LeBlanc) - Leader of the Oni and a dangerous combatant. He and the rest of the Oni are presumably killed when the Ninja combined their powers to perform a Tornado of Creation.

• Ice Emperor (voiced by Brent Miller) - Ruler of the Never-Realm and Leader of the Blizzard Samurai. He is revealed to be Zane later in the season. Zane connected himself to Lloyd's Titan Mech via plug, and attempted to run a system diagnostic, only to have the plug pulled by Vex. This resulted in Zane's memories being erased. Vex manipulated Zane into conquering the Never-Realm and the latter became more bitter as time went on, using the Scroll of the Forbidden Spinjitzu as his scepter. He regains his memories and turns the Never-Realm back to normal by destroying his scepter.
• General Vex (voiced by Michael Kopsa) - Ice Emperor's Second-In-Command and general of the Blizzard Samurai. He was a Formling, but was excluded and mocked for being unable to find his form, likely a thought of his clouded mind. He manipulated Zane into conquering the castle and making ruthless decisions against the other inhabitants of the Never-Realm. Once Zane regained his memories and destroyed his scepter, Vex was banished further into the Never-Realm.
• Grimfax (voiced by Brian Drummond) - The leader of the Blizzard Warrior army. He was the ruler of the Never-Realm before Zane and Vex usurped him. He sides with Lloyd and Kataru later in the season. Once Zane regained his memories and destroyed his scepter, Grimfax reclaims his throne and aligns with the Formlings to banish Vex.

• Akita (voiced by Tabitha St. Germain) - A Formling with the ability to change into a wolf. She accompanies Lloyd after saving him, in order to kill Zane for her twin brother, Kataru, and the Formlings. She reunites with her brother when Zane destroyed the Scroll of forbidden Spinjitzu.
• Kataru (voiced by Cole Howard) - Akita's twin brother, and a Formling with the ability to change into a bear. He was thought to be dead when Zane attacked his village, but was later revealed to be a prisoner. He helps Lloyd and Grimfax to help bring Zane back to normal. He reunites with his sister when Zane destroyed his scepter.

• Unagami (voiced by Dean Redman) - A mysterious AI, the ruler of Prime Empire and the leader of the Red Visors.
• Sushimi (voiced by Vincent Tong) - A sushi chef and inhabitant of Prime Empire. He is a member of Unagami's army and is the final boss of Prime Empire when the player reaches the Temple of Madness.
• Scott (voiced by Adrian Petriw) - A player of Prime Empire and a mechanic, he allies with the Ninja during their time in Prime Empire.
• Okino (voiced by Alessandro Juliani) - A Samurai that guided players to the Purple Key-Tana in Terra Karana. He decides to go on his own adventures after learning that he can make his own decisions.
• Racer Seven (voiced by Shannon Chan-Kent) - An inhabitant in Prime Empire and a racer in the Speedway Five-Billion race. She competes in a version of Lloyd's Jungle Raider from the fourth season and allies with the Ninja. She seeks to win the Key-Tana to feel like she has truly accomplished something.
• Anthony Bruton "The Brute" Nelli (voiced by Bill Newton) - An inhabitant in Prime Empire and a racer in the Speedway Five-Billion race. He competes in a version of Kai's Katana 4x4 from the eleventh season and seeks to win the Key-Tana for a sense of achievement.
• Hyper-Sonic (voiced by Matt Hill) - An inhabitant in Prime Empire and a racer in the Speedway Five-Billion race. He competes in a version of Jay's Thunder Raider from the third season and seeks to win the Key-Tana for its financial value.
• Richie (voiced by Sam Vincent) - A member of the Whack Rats and a racer in the Speedway Five-Billion race. He competes in a newly seen vehicle and seeks to win the Key-Tana to bring glory to the Whack Rats.
• Sarvesh (voiced by Sam Vincent) - A member of the Whack Rats and a racer of the Speedway Five-Billion race. He is the white rat with the crossed out Sons of Garmadon logo on the back of his torso.

• Soto (voiced by Alan Marriott) – The leader of a band of pirates, and the original captain of the Destiny's Bounty. Soto was resurrected by Garmadon in the second season and has served as a minor antagonist ever since. He served as an ally to the Ninja in the sixth season, yet reverted back to his evil ways following Jay's final wish.
• Lil' Nelson (voiced by David Reynolds) - The honorary Purple Ninja. In season 6, he was confined to a wheelchair due to breaking his legs, and was made a Ninja for a day for the Grant-a-Wish Foundation. In season 11, he became a paperboy.
• Krag (voiced by Brian Drummond) - The last surviving yeti in the Never-Realm whom Cole befriends.
• The Mechanic (voiced by Michael Antonakos (Season 6, Season 11-onwards), Alan Marriott (Season 8) - A former noodle truck repairman and Kryptarium Prison inmate. In season 6, he intimidated the Ninja, hoping to steal robotic parts from Zane. He reappeared in season 8 as a minor character, fighting Kai and Zane before being frozen by the latter. He despises Nya the most of all the Ninja. He reappeared in the Prime Empire Original Shorts, aligning himself with a villain named Unagami.
• Antonia (voiced by Brynna Drummond) - A papergirl who mentors Nelson.
• Fugi-Dove (voiced by Adrian Petriw) - A Kryptarium Prison inmate who claims he is the Ninja's 'frequent, and well known, archenemy.' He despises Jay the most of all the Ninja. Despite his claims of being a famous outlaw, he has no criminal record for unknown reasons, implying he may suffer from delusions of grandeur. However, it is still unknown why he is imprisoned in Kryptarium and how he had no criminal record despite being imprisoned.
• Clutch Powers (voiced by Ian James Corlett) - A famous adventurer and suspended member of the Explorers Club. He is the series' interpretation of the same character from the 2010 LEGO film LEGO: The Adventures of Clutch Powers, though the two version are independent of each other.

The Ninja appear as playable characters in Lego Dimensions. Additionally, a large range of Ninjago mobile games have been released. Three video games have been released.

A video game called Lego Battles: Ninjago was released in April 2011. It was based on the two pilots of the series, and it features some of the characters who appear in the original episodes.

Lego Ninjago: Nindroids is an action-adventure game for the Nintendo 3DS and PlayStation Vita,[41] The game was developed by Hellbent Games and co-published by TT Games Publishing July 29, 2014.[42][43] Lego Ninjago: Nindroids was announced March 2014 as the second video game based on the LEGO Ninjago line of play sets.[42] The game was targeted at a younger audience.[44] The game has the same plot as the third season of TV series.[42] In the game, the player assumes the role of a Spinjitzu Master tasked with defending the New Ninjago City from The Overlord's evil Nindroid army.[41][42] The game contains 30 levels consisting of puzzles and battle sequences.[41] NintendoLife thought this game was beginning to evidence the formulaic nature of the Lego universe of video games,[43] while JeuxVideo thought the game was repetitive.[44] The game was in the top-10 best-selling list of games for PlayStation Vita in New Zealand in May 2017.[45]

Lego Ninjago: Shadow of Ronin is an action-adventure game developed by TT Fusion and published by Warner Bros. Interactive Entertainment in March 2015.[46] The game was released initially for Nintendo 3DS and PlayStation Vita,[47] and later for iOS[48] and Android.[49] The game further adapts the TV series,[50] and serves as a sequel to Lego Ninjago: Nindroids.[46] Although non-canon to the TV series, it takes place just after the fourth season, the original voice cast don't reprise their roles for the characters, due to recording studios being in different locations, instead they are voiced by American actors. After Garmadon sacrificed himself and was sent into the Cursed Realm, Lloyd left the team to cope with losing his father. The remaining members meet the new threat Ronin, a mercenary, who partially erases the Ninja's memories. The Ninja travel to the Toxic Bogs, after which they have a vision of weapons that can restore their memories. They collect the weapons and go to see Lloyd, who takes them to see his mother for help. Once they find the Primal Fulcrum, the Ninja free Lloyd's mother from Ronin's control. Ronin freezes them and grabs the remaining elemental forges. He plans to use the Fulcrum to bring back Chen from the Cursed Realm. The Ninja chase Ronin into a portal, where the Ninja have a final battle with Ronin; he escapes and knocks the Ninja's weapons into the abyss. The ending reveals the game was a story told by Kai. In an epilogue, Dareth steals the Helmet of Darkness to control the Stone Army. Warner Brothers announced the game in December 2014.[51] The game is single-player.[52] It has new gameplay items, though the gameplay and characters are familiar.[51] The game was targeted at a younger audience.[53][52] Both PocketGamer and Nintendo Life said the game negatively felt the same as the previous games in the Lego series.[52][46] PocketGamer praised the better graphics but was frustrated with the controls on iOS, especially with time-sensitive actions.[52] Nintendo Life appreciated the humor but thought the graphics had issues on the 3DS.[46] The game was in a top-10 best-selling list of games for PlayStation Vita in New Zealand in May 2017.[45]