List of ''The 100'' characters

Sky People

Sky People (also known as Arkers, or Skaikru in Trigedasleng) is a term used by the Grounders to describe the people who came from the international space station known as the Ark. The Sky People alive today are descendants of humans who survived the nuclear apocalypse 97 years before the series by living in space in the Ark. Within the Sky People community, there is a subgroup known as The 100 (also known as the delinquents), a term used to describe one hundred juvenile delinquents who, after it became clear that the Ark was dying, were sent to Earth in order to determine if the planet had become habitable enough for the rest of the Sky People to survive in exchange for being pardoned of their crimes. However, the name the 100 is a slight misnomer, since, along with the aforementioned hundred delinquents, there were also two additional young adults who came with them to Earth; one was a security guard who snuck aboard their ship to ensure the safety of his sister, and the other was a young engineer who came down to Earth in a pod shortly afterward to reassure the council that the delinquents survived their journey.

Grounders

Grounders (or Outsiders, as they are known by the Mountain Men) is a collective term to describe groups of people who were born on Earth rather than in space or in Mount Weather. The Grounders are descendants of humans who survived the nuclear apocalypse 97 years ago, due to their enhanced tolerance to nuclear radiation. Many of the Sky People have negative views toward Grounders, who they see as barbaric stone-age savages, just like a lot of Grounders have a negative view of The 100, who they see as hostile colonizers, though relations between the two groups are slowly improving over time. The Grounders speak an English-based pidgin language called Trigedasleng, although many of them also know regular English. Grounders were the primary antagonists of the first season. There are at least twelve Grounder clans in eastern North America, including the woods clan known as the Tree People (Trikru or Trigedakru in Trigedasleng), the dominant clan; Ice Nation (Azgeda), antagonists of the third season (along with A.L.I.E.) and the fourth; the Boat People (Floukru or Floudonkru); and other tribes such as Glowing Forest (Trishanakru), Rock Line (Boudalankru), Broadleaf (Yujleda), Blue Cliff (Ouskejonkru), Plains-riders (Ingranronakru), Shallow Valley (Louwoda-Klironkru), the Desert People (Sankru or Sangedakru), the Lake People (Podakru), and the Delphi (Delfikru).

Mountain Men

Mountain Men (or Maunon in Trigedasleng) is a term used by the Sky People and the Grounders to describe the small colony of people who reside in Mount Weather. They are the primary antagonists of the second season. The Mountain Men (a term encompassing the women and children as well) are descendants of humans who survived the nuclear apocalypse 97 years before the start of the series by bunkering down inside Mount Weather, protecting them from the radiation caused by the bombing, but also preventing them from developing an immunity to the radiation as the Grounders did. This not only forced them to remain inside the facility unless they wore protective suits, they also had no choice but to capture Grounders and harvest their blood, which they used for transfusions to survive even the small amount of radiation exposure they received inside Mount Weather. The Mountain Men are responsible for creating the acid fog that has killed numerous outsiders, as well as the barbaric Reapers who helped them capture Grounders for their blood-harvesting program. Because so many Grounder and Arker lives were lost in the name of the Mountain Men's survival, both groups hold very negative views toward those residing in Mount Weather, although some people within the mountain actively reject treatment with the blood stolen from Grounders unless absolutely necessary, for moral reasons. In the second season, while holding forty-seven of the 100 prisoner, the Mountain Men discovered that a transfusion of bone marrow from the former Ark residents could grant them permanent immunity from the radiation, but the eventually fatal consequences for captured Arkers of the marrow-harvesting drive Clarke to a point where she is forced to open the air filtration system of the mountain, killing every one of the Mountain Men in order to save her own people. The Mountain Men are finally extinct when Clarke kills Carl Emerson, the last of the Mountain Men living in the third season.

Eligius IV prisoners

The ship Eligius IV carrying prisoners was deployed to asteroid Proxima VI before the nuclear apocalypse on Earth happened. The purpose of the expedition was to mine Hythylodium. In 2047, the prisoners started to become sick and the captain issued "Order 11", which would abandon the prisoners on the asteroid. Out of altruistic reasons, one of the ship's pilots Miles Shaw deactivated the shock collars of prisoners that lead to the massacre of the ship's crew and an explosion that destroyed one of the engines. Led by Charmaine Diyoza, the prisoners decide to return to the post-apocalyptic Earth but with an engine destroyed, it would take decades to reach there. The prisoners put themselves through cryosleep to evade aging. In 2156, Shaw piloted the transport craft Gagarin and lands Diyoza with a party of prisoners in the Shallow Valley, which is apparently the only habitable place left after the radiation wave Praimfaya in the fourth-season finale.

Clarke Griffin

Eliza Taylor portrays the role of Clarke.

Portrayed by Eliza Taylor, Clarke Griffin^[5] is the daughter of Abigail Griffin and Jake Griffin, and the effective leader of the 100 for much of the series. Her backstory is that she was imprisoned as an accessory to the crimes of her father after attempting to inform their people that the Ark was dying, and thus ended up among the 100. Down on the ground, she tries to ensure the 100's survival by assisting in the acquisition of food and resources, and she also continuously serves as their main medic before her mother and the other medical staff join them on Earth. She is portrayed as relatively benevolent, but has been shown to act ruthlessly to fight or kill in order to protect her people if there are no other options, and she possesses natural leadership qualities with the help (and early on, the opposition) of Bellamy. They learn to love each other. After killing the entire Mountain Men population to save her fellow Sky People, Clarke becomes known in Trigedasleng as Wanheda (literally "Death-commander") and is sometimes also called Mountain-slayer. Clarke becomes gradually hardened and matured by her experiences on Earth, namely the acts she has been forced to commit to survive and protect her people. This transforms her into a strong but personally troubled heroine in the series, as she continues to struggle to reunify humankind by maintaining the uneasy peace between the Arkers and some of the Grounders, and between groups among her own people. On February 28, 2015, the series creator Jason Rothenberg confirmed that Clarke is bisexual; this makes her the first openly bisexual lead character on the CW network.^[7]

Abby Griffin

Portrayed by Paige Turco, Abigail (Abby) Griffin is Clarke's mother.^[5] She is the chief medical officer of the Ark and the main proponent regarding the habitable status of Earth. Her husband was the chief engineer, Jake Griffin. She was a member of the Council led by Chancellor Jaha on the Ark before being stripped of her title, though she regained this position shortly afterward. Upon her arrival on Earth, Abby was Chancellor for a time when Marcus Kane gave her his pin. During this time she ruled autocratically, refusing to let Kane take over again on his return and betraying her former friend Jaha by putting him in prison. Abby becomes friends with Raven Reyes when she needs her mechanical expertise to try to get more information on what the 100 is dealing with on the ground. She begins to like the young engineer due to her reminding her of Clarke. Abby's relationship with her daughter became strained following Clarke's discovery of her mother's betrayal to her father which led to his execution. It only became more complicated once Abby and the rest of the people from the Ark joined the 100 on Earth, as they were both the leaders of their respective groups of people. Abby continues to work as the resident doctor in the newly established Sky People colony known as Arkadia (formally Camp Jaha) and has supported Marcus Kane's campaign for peaceful cohabitation with the Grounders, putting her at odds with the anti-Grounder factions within their people.

Finn Collins

Thomas McDonell portrays the role of Finn.

Portrayed by Thomas McDonell, Finn Collins (seasons 1–2)^[5] is a caring teenager who is always looking for fun and a peaceful solution. He is more interested in helping others than seeking vengeance. He was arrested for being a spacewalker and wasting the Ark's limited oxygen supply, but it was revealed that he was innocent and had taken the fall for Raven, his girlfriend, to ensure she did not ruin her engineering career or get floated. Originally Clarke's love interest, Finn's relationship with Clarke starts collapsing when she discovers his relationship with Raven. His romances with both girls ultimately end, but Finn and Clarke still love each other, and Raven still loves Finn. In the second season, his fear that Clarke has been killed by her captors in addition to the hardships he has endured cause him to become unpredictable and violent. He murders eighteen unarmed Grounders who he believed had taken Clarke hostage, and was willingly going to leave several fellow Arkers for dead in favor of continuing his search for her. As a result of his actions, the Grounders demanded retribution before they will agree to a truce between them and the Sky People, leading Commander Lexa to sentence Finn to death by a thousand cuts. However, he was mercifully killed by Clarke to prevent the Grounders from slowly and painfully killing him, though he did appear one last time during Clarke's grief-induced hallucinations.

Wells Jaha

Eli Goree portrays the role of Wells.

Portrayed by Eli Goree, Wells Jaha (season 1; guest season 2)^[5] was Clarke's childhood best friend and the son of Thelonious Jaha, who was the Ark's Chancellor at the start of the series. He is despised by some of the 100 upon landing on the ground because of his father. He intentionally committed a crime when he found out about the imminent launch of the delinquents to Earth so as to join the group in the hope to protect Clarke, for whom he harbors feelings. Clarke believed he was the reason her father is dead, only to find out later that her mother was the one who betrayed her father, and Wells willingly took the blame to prevent Clarke from hating her. On the ground, he is hardworking and thoughtful, volunteering to dig graves and collect rainwater to aid their newly established colony. It was his expert knowledge of botany that made him a valuable ally to Clarke, as she was tasked as the 100's medic due to her previous experience as the daughter of a doctor and needed herbal medicines to treat the ill and injured members of their community. He was murdered by Charlotte in the third episode, who wanted retribution for his father's execution of her parents on the Ark. He appears once again in the second season, when a hypoxic Thelonious hallucinates that Wells is alive and with him on the Ark, when everyone else has left for the surface.

Octavia Blake

Portrayed by Marie Avgeropoulos (and by Olivia Steele Falconer as child) Octavia Blake^[5] is Bellamy's younger sister – a rare relationship given the Ark's one-child rule. She was kept a secret by her family, living under the floor to avoid detection by authorities, but was eventually caught when Bellamy sneaked her out of her room to attend a masked ball. Once discovered, some of the detainees discriminate against her for being a second child and thus an outcast to the Ark's dystopian society. She is a fiercely independent girl who is constantly rebelling and getting attention from men, most notably the Grounder Lincoln. However, just like Clarke, she is not exactly built for war so she is horrified at what she sees and experiences at first. In the second season, she becomes more immersed in Grounder culture and serves as Indra's second. Originally she felt hatred towards Clarke for being the daughter of someone in the same council who had her locked up. It is intensified when she discovers Clarke knew about the bombing of Tondc, did nothing about it, and allowed all those Grounders to die after the events of Mount Weather (even telling Indra that she will not leave behind Bellamy and her friends). She remains in her Grounder gear, and berates Lincoln for wearing an Ark jacket and for being naive as she still holds a grudge towards them. Eventually, Lincoln is brutally killed in front of her by Pike, causing a rift between her and Bellamy. In the fourth season, she shows more signs of being bloodthirsty after killing an ambassador who questions Roan's leadership. This new violent attitude earned her the nickname Skairipa ('Sky-reaper') or Death from Above. After refusing to kill Illian and getting close with him she decides to drop the act and take him home. She later accepts the fact that she is a killer and will fight in the Grounder battle for the bunker alongside Trikru, in which she is victorious after killing Luna, and becoming the acting leader of all 12 clans by telling them they will share the bunker. She finally forgives Bellamy for Lincoln's death after he opened the bunker realizing that he would put his own life in danger just to save her and the Grounders. She later protects Nilyah and further solidified her role as new leader by saying if Skaikru does not choose the 100 people to stay in the bunker then she will kill every Skaikru member. In the season finale, she officially becomes new leader of the new Grounder tribe consisting of Skaikru, Trikru, Azgeda, and other Grounder clans, regardless of her blood and what's in her head. In the fifth season, although still reluctant on being the leader, she tries to make peace with everyone. Eventually overpopulation prevents from any real peace inside the bunker, so Octavia takes matters into her own hands and kills anyone who defies her or questions her view of what peace should be. Thus covering herself in their blood and being told by Gaia that it is best she keeps the blood on her, thus becoming Bloodreina (the Red Queen) and decides anyone who breaks her laws must compete in death matches, her ruthless actions as ruler of Wonkru include burning any food given by Diyoza and murdering anyone who defects, though allows Madi to train with her after revealing herself to be a Nightblood.

Bellamy Blake

Bob Morley portrays the role of Bellamy.

Portrayed by Bob Morley, Bellamy Blake is Octavia's brother.^[5] He professes a strong determination to protect his sister, spanning from her birth. He often says "my sister, my responsibility". He was the leader of the 100, although often loses focus and control over the group, and uses militaristic approaches. He develops from an antagonistic character to an antihero, realizing the 100 matter to him and showing compassion towards enemies and fallen comrades.

He initially clashes with Clarke over their opposing approaches to their respective responsibilities over their people, but ultimately both he and Clarke develop a mutual respect and learn to compromise for each other's methods. He still feels guilty for getting Octavia caught, which led to her lockup and his mother's death.

In the third season, he aligns himself with the new Chancellor after Azgeda (Ice Nation) bombed Mount Weather, killing 49 people, including his girlfriend. In the process, he betrays Marcus Kane and put the whole of The Ark at risk of death. The bombing was made possible because Bellamy trusted Echo, the Grounder he saved in the previous season in Mount Weather, and listened to the false information she delivered. He helps to put in prison his sister's boyfriend Lincoln, which leads to Lincoln's execution. After Pike's election, Bellamy is one of the nine guards (along with Pike himself) that carry out the chancellor's orders to kill the 299 Grounder warriors sent by Lexa. Bellamy soon feels guilt for his actions, and while he saves Indra's life, this puts a rift between him and Octavia, as well as Kane. He remains one of the few people not taken over by Allie, and fight alongside Octavia and Pike to stop her. Afterwards he reconciled with Kane and is often the voice of reason between the Sky People and Grounders. Octavia forgives him after he risks his own life to open the bunker and let the Grounders in, feeling it is selfish for the Sky People to hog all the places in the bunker. In the fifth season, it is revealed he survived back on the Ark in space. During the six years there, he and Echo not only reconciled but became lovers. After being reunited with Octavia, he feels he does not recognize her anymore due to her brutal and unforgiving ways, but still tries to get through to her. It was also his idea to try and take the cryogenically frozen prisoners hostage and have leverage with Diyoza.

Cece Cartwig

Kelly Hu

Portrayed by Kelly Hu, Callie "Cece" Cartwig (season 1)^[5] is the best friend of Abigail Griffin as well as the Ark's communications officer. Callie is first seen talking to the people on The Ark about the 100 going down to Earth. She said that she cannot confirm or deny anything at the moment. When Callie comes to know that Abigail Griffin is going to be executed she goes up to Marcus Kane to tell him that he is out of his mind and he cannot kill everyone who disagrees with him. Callie says that Abigail is her friend leaving Kane to reply that he cannot do anything to stop it. Kane and Callie share a close moment. She tries to implore him to give Abby amnesty, asking him to think of their own relationship. He answers by saying that no matter what he feels, he cannot. When it is time, Callie breaks into tears walking with Abigail to the place where she will be executed, embracing her and refusing to let go even at the behest of the guards. Abby asks that Callie watch out for her daughter before she dies. When the door is about to close Chancellor Thelonious Jaha demands the execution be stopped immediately. Callie is thrilled for Abigail, able to hold her friend again. Jason Rothenberg revealed that Hu was dropped after the first episode due to budget reasons.^[8]

Monty Green

Portrayed by Christopher Larkin, Monty Green (seasons 1–5)^[5] is a smart and tech-savvy teenager who is a valuable asset to the teenagers on Earth due to his pharmaceutical and engineering knowledge. He and Jasper were arrested for making illegal substances. He is best friends with Jasper and is among the 48 held in Mount Weather, eventually escapes and reunites with his mother in the third season. He tries to help Jasper recover from the traumatic events in Mount Weather. He eventually becomes part of Chancellor Pike's cause after his friend Monroe is killed by the Grounders. In the process he gets Marcus Kane put in prison and Lincoln killed. He eventually betrays his mother and Pike in "Stealing Fire" by helping Kane, Octavia, Harper, Miller and Sinclair escape by feeding members of the Ark Guard faulty intel and distracting them. In "Nevermore", Monty is forced to kill his mother—who had taken A.L.I.E.'s key—after she nearly kills Octavia. In "Red Sky At Morning", Monty has sex with Harper in Arkadia, and is forced to delete and essentially kill his mother for a second time by wiping her memory from the City of Light. In the fourth season, he comes up with the idea of protecting his people by shielding Arkadia with a hydrogen generator and recruits Bellamy, Harper and Miller to gather it when they do they blow it up to rescue the slaves taken by the Ice Nation, there he learns that the Chief killed his father and instead of killing him himself he allowed the slaves vengeance by freeing them, After realizing Harper chose to stay behind in Arkadia he decides to stay with her until she changes her mind, she is eventually convinced and they search for more people to recruit. In the fifth season, he is still with Harper but still feels guilty about killing his Mother and letting Jasper commit suicide. By the end of the season, it is revealed that he died with Harper after growing old with her and raising their son, Jordan.

Jasper Jordan

Devon Bostick portrays the role of Jasper.

Portrayed by Devon Bostick, Jasper Jordan (seasons 1–4) is a goofy and geeky chemist. He is Monty's best friend. After his capture and subsequent rescue from Grounders, he becomes traumatized by his near-death experience which he struggles to overcome. Early in the series, he has a crush on Octavia, even saving her life during an animal attack, but she offers her friendship in return instead. He was one of the delinquents' camp's gunners and is among the 48 held in Mount Weather, and becomes an acting leader of his surviving people in Clarke's and Bellamy's absences. Jasper later becomes romantically involved with a Mount Weather resident, Maya who was later killed. In grief, Jasper becomes an alcoholic and he is disgusted that his own people would steal from Mount Weather after the war with its inhabitants as well as hating Clarke. Monty and Octavia struggle to help Jasper to cope with his loss, but although Jasper was briefly tempted by the City of Light tablets, when he realised that they erased all good memories relating to painful topics, he refused to take one, even breaking Raven out of Camp Jaha and taking her to Clarke and other escapees for medical treatment to remove the chip. It is revealed that he has been chipped while on Luna's oil rig and turns on the 100 under A.L.I.E.'s command. He is freed from her control once she is defeated. In the fourth season, he attempts suicide only for Raven to tell him they only have six months to live. He eventually commits suicide by remaining at Arkadia exposing himself to a lethal dose of radiation that comes before the death wave.

Thelonious Jaha

Isaiah Washington portrays the role of Thelonious.

Portrayed by Isaiah Washington, Thelonious Jaha, commonly referred to as "Jaha" (seasons 1–5)^[5] is Wells' father and the former Chancellor of the Ark. Jaha, along with Marcus, were best friends with Jake Griffin and his family. However, his and Marcus' friendship with the Griffins deteriorates after Jake's death and Clarke's subsequent arrest but he manages to maintain his friendship with Abby. He loses his power while on Earth as he clashes with Abby and Marcus over their views on the Grounders in addition to the unconfirmed destination, the "City of Light". Along with Murphy, he leads a small group of his followers from Camp Jaha to find the city. Having discovered A.L.I.E., the artificial intelligence that controls the City of Light, Jaha has become the delegated leader of A.L.I.E.'s cult, manipulating others into joining to escape the pain of daily life. Jaha is unconcerned about the side-effects even when presented with clear evidence that the City of Light erases even good memories to spare the users from psychological pain, such as Jaha having lost all memory of his son, he is soon freed from A.L.I.E.'s control after her defeat. He becomes guilt ridden after he sees all the casualties in Polis due to him feeding everyone a chip. In the fourth season, he assists Clarke in being a leader for her people such as suggesting they find shelter in a lost bunker, only to discover it could not hold out radiation. Jaha tells everyone that if they want to survive the second nuclear explosion they must earn a lottery pick to ensure they will be on that list. He eventually comes to the realization the bunker was a decoy and the real one is in Polis, the Grounder capital, so he decides to recruit Gaia on what she knows about the symbol on the token and eventually learns it is a key to open the bunker. He eventually finds it and successfully opens it, he takes a child after promising his father to take care of him. In the fifth season, he is stabbed by a Grounder and dies in front of Kane, Abby, and Octavia.

Marcus Kane

Henry Ian Cusick portrays the role of Marcus.

Portrayed by Henry Ian Cusick, Marcus Kane^[5] is one of the Councillors on the Ark. When Thelonious Jaha was Chancellor, he was second-in-command. He, along with Jaha, were friends with Jake Griffin and his family, but his friendship with them did not last after Jake's execution and Clarke's subsequent arrest. Though he initially supports population culls to extend life on the Ark, when Earth is shown to be survivable, he is guilt-stricken and works with everyone to survive in hopes of making amends of his past misdeeds. This, in addition to his mother's influence and death, affect his later actions of seeking peaceful and compromising solutions when governing his people after arriving on Earth. In the process he gains allies who respect his new approaches, rebuilds his friendship with Jake's wife Abby Griffin, and earns the Grounders commander Lexa's trust. Kane aligns himself with Abby, who becomes Jaha's successor. In the fifth season, six years after Praimfaya he takes the fall for Abby's crime and proceeds to fight in gladiator battles but refuses once Octavia shows signs of being a dictator.

Raven Reyes

Lindsey Morgan portrays the role of Raven.

Portrayed by Lindsey Morgan, Raven Reyes (season 2–present; recurring season 1) is an ambitious zero-gravity mechanic when on board the Ark who is not afraid of anyone or anything. She later collaborates with Abby Griffin in her escape from the Ark and launches herself in a pod to Earth, and occasionally advises Abby in the fields in electronics and mechanical engineering after she becomes chancellor on Earth. Brave and intelligent, Raven leads the camp in setting up communications and making bombs. She was childhood friends with Finn and was in a relationship with him until he fell in love with Clarke. It is revealed in the second season, that Finn took the blame for Raven's crime because she was already 18 and would be floated. She was the first zero G mech student under the age of 18 in 52 years. In the third season, with Abby's help, Raven begins recovering from the injuries she sustained from last season. She joins Jaha's cause after reluctantly taking a tablet given to her by him, she does begin to fight the side effects after Jasper reminds her about Finn. She is soon saved by Clarke and freed of A.L.I.E.'s control. In the fourth season, she bonds with Luna for her loss and convinces her to help save everyone on Earth, she also forgives Murphy for shooting her in the spine. It is revealed while taking the chip she is able to use 90% of her brain but developed a tumor that could cause her to have a stroke, possibly leading to her death. She later hallucinates Becca who tempts her with the chance to spacewalk leaving her to stay behind. A Sinclair hallucination appears to tell her to continue living which gives her the motavition to fight off Becca by restarting her heart. Afterwards, Clarke rescues her and request she fly them to The Ark in which she agrees to do, and successfully able to fly them to space and finally was able to spacewalk again. In the fifth season, Raven becomes an improved fighter being able to topple Echo in combat and plans to return to earth she soon notices another ship landing on Earth, and proceeds to follow it, she realizes there is other life forms in cryostasis on the Eligius ship and decides to stay behind and lies about an escape pod so Bellamy will not argue with her.

Lincoln

Ricky Whittle portrays the role of Lincoln.

Portrayed by Ricky Whittle, Lincoln (seasons 2–3; recurring season 1) is a Grounder who rescues Octavia. The pair develop a romantic relationship, and Lincoln helps the 100 multiple times, causing him to be viewed as a traitor to his people. He later is drugged to become a reaper, but with Clarke's and Abby's assistance, he is successfully rehabilitated from the drug. Having been viewed as a traitor by some of his people, Lincoln resides in Camp Jaha with Octavia. He is put in prison by Pike with the help of Bellamy and shot by Pike after surrendering to save his fellow Grounders from execution.

John Murphy

Richard Harmon portrays the role of Murphy.

Portrayed by Richard Harmon, John Murphy (season 3–present; recurring seasons 1–2) starts out as one of Bellamy's men and is generally disliked by the group due to his reputation of being a troublemaker and career criminal, making him one of the few members to actually have committed felonies and not petty misdemeanors. After being wrongfully accused by Clarke and nearly lynched, he tries to kill Charlotte. As a result of her suicide, he is banished from the camp. He later returns, surviving being tortured by the Grounders. He seems to have forgiven the 100, but he kills two and attempts to hang Bellamy and accidentally shoots Raven in the spine. In the second season, he helps the 100 as they search for their lost members, even saving Bellamy's life when he could have let him drop. As he is still disliked in Camp Jaha, he accompanies Jaha to find the City of Light. He eventually finds a lighthouse where he is trapped by Jaha and A.L.I.E. after watching something that horrifies him (later revealed to be a video that shows that Allie caused the nuclear holocaust). He later leaves the island after not wanting to be a part of Jaha's insane missions, and gets a boat ride from Emori. After Emori transports him and Jaha across the sea, he refuses to take the key and flees with Emori. They start robbing people in the Commander's Forrest and he is eventually captured by Grounder warriors and brought to Polis, as one of the captors discovers a chip in his pocket which has the "Sacred Symbol of the Commander". He is tortured for information by Titus and eventually tells him what he knows. Later on, Titus tries to murder him and frame Clarke but accidentally shoots and kills Lexa. After she dies he witnesses Titus remove the chip. After Titus gives Clarke the chip and commits suicide, Ontari makes him the new "Flamekeeper" since he is the only other person to have witnessed it being removed from another person. Ontari takes a liking to him and wants him to sleep with her; if he refuses, she will kill him. He later reunites with Emori who is under A.L.I.E.'s control, and A.L.I.E. implies to her that Ontari's had sex with him. After the City of Light is destroyed and A.L.I.E.'s control over everyone dissolves, Murphy stays behind with Emori. When he finds out there's a nuclear disaster coming which will wipe out everyone on Earth, he and Emori decide to side with Clarke, who has a plan that might save 100 people. Murphy ends up helping Raven with another plan, and he is confronted with what he is put her through after he shot her. When Raven opts to stay behind, he has a rare emotional moment and shares a tearful goodbye with her. In the fifth season, six years after Praimfaya, he breaks up with Emori suffers an inferiority complex, as they land on the Eligius ship before Bellamy and the others land on Earth, he decides to stay on the ship to protect Raven only for her to berate him by telling him she lied about the escape pod, much to his dismay.

Roan

Portrayed by Zach McGowan, Roan (season 4; recurring season 3) is an Ice Nation fugitive who is tempted by Lexa to kidnap Clarke. He turns out to be Prince Roan, son of Queen Nia. He later becomes king of the Ice Nation after Lexa kills Nia for attempting to overthrow her. He supports Ontari as the new Commander and attempts to track down Clarke who has escaped with the Flame. Roan and Clarke instead form an alliance to give Ontari the Flame to help shut down A.L.I.E. but the plan fails and Roan is shot by Kane. He is rescued when Clarke and Abby take the bullet out of his chest. Echo tries to tempt him to kill Clarke for her crimes as well as secure his position as ruler of the 13 clans. However, Clarke gives him A.L.I.E. 2.0 in hopes that he will let her and her people live to save the planet from the nuclear explosion in 6 months which he accepts. Later, he learns that Skaikru seems to be protecting themselves thus ending the alliance. Clarke convinces Roan to share Arkadia until it explodes. He takes part in the challenge where each tribe sends a champion to fight for the position of the leaderb – who gets to decide which tribe survives in the bunker. He banishes Echo for trying to cheat in the tournament, and declines to fight Raven, whom he respects. In the end he is killed by the Nigthblood Luna, who drowns him.

Echo

Portrayed by Tasya Teles, Echo (season 5–present; guest seasons 2–3; recurring season 4) is a former Ice Nation Grounder who was trapped at Mount Weather. She saves Bellamy's life, which leads him to trust her and he helps her escape. She later betrays him and helps act out a plan that led to the destruction of Mount Weather. After the events in the City of Light she blames Skaikru for all the casualties and demands for Clarke's execution. She becomes a royal guard and the bodyguard of Roan, but is banished for her interference in the Grounder battle. She assists Octavia in trying to open the bunker, but Octavia will only help Azgeda and not her. She fights off Grounders who tried to kill Clarke and provides protection onward in exchange for her safety when the death wave hits. In the fifth season, she is romantically involved with Bellamy, and afraid to return to earth knowing Octavia will want her dead, once she returns to earth she is confronted by Octavia who reminds her of her banishment but gives her an ultimatum on spying on the people of Eligius in exchange for banishment being lifted, and Octavia executes several of her people to make her defection seem legitimate.

The 100

• Jarod Joseph as Nathan Miller: One of the 100. He was among the surviving 47 held in Mount Weather in the second season. While in Mount Weather, it is revealed that Miller was arrested on the Ark for thievery. He is able to escape Mount Weather and is reunited with his father at the end of the second season, who was the head security guard on the Ark. In the first episode of the third season, Miller is reacquainted with Bryan, his boyfriend. He becomes a member of Arkadia's Guard but secretly sided with Kane alongside Harper as they tried to overthrow Chancellor Pike. He is one of the few Skaikru members who did not take A.L.I.E.'s chip to join the City of Light, and survives the battle in Polis in the season finale. In season five, he has entered a relationship with Jackson.
• Chelsey Reist as Harper McIntyre (seasons 1–5): One of the 100. She had a crush on Jasper at the beginning of the first season, although it ended up going nowhere. She is among the 47 held in Mount Weather in the second season, and was the first to have her bone marrow forcibly extracted from her. She and Monty are the only two who survived having their bone marrow extracted. After escaping and returning to Arkadia, she joins Arkadia's Guard and secretly sides with Kane alongside Miller as they tried to overthrow Chancellor Pike. She is one of the few members of Skaikru who did not take A.L.I.E.'s chip to join the City of Light. She sleeps with Monty in the third season, and is saved by him in the season finale when a chipped Jasper knocks her unconscious and takes her hostage in Arkadia. In the fourth season, after feeling she sacrificed one of her own for her own survival she decides to stay behind with Jasper and Monty. She eventually comes to her senses and goes with Monty to recruit as many people to join them in the bunker. By the end of the fifth season, it is revealed that she died with Monty after growing old with him and raising their son, Jordan.
• Katie Stuart as Zoe Monroe (seasons 1–3): One of the 100 who suffocated to death in a Grounder village after escaping a fire in the third season.
• Keenan Tracey as Sterling (seasons 1–2): One of the 100. He fell to his death trying to rescue his friend Mel, who was the sole survivor when her section of the Ark crash-landed.
• Genevieve Buechner as Fox (seasons 1–2): One of the 100. She is among the 47 held in Mount Weather. She was nearly killed for her bone marrow in Mount Weather, but Bellamy saves her. She is killed shortly after anyway for her bone marrow.
• Rhys Ward as Atom (season 1): One of the 100 who was an adviser to Bellamy and became romantically involved with Octavia. He was severely burned by the acid fog and Clarke killed him out of mercy.
• Izabela Vidovic as Charlotte (season 1): One of the youngest members of the 100, who was arrested for attacking a guard. She has recurring nightmares about Chancellor Jaha executing her parents. She attempts to stifle the nightmares by killing his son, Wells, but later breaks down and confesses before jumping off a cliff to her death. Despite murdering her best friend, Clarke chose to protect Charlotte from the more aggressive members of the group who wished to kill to her, and banished Murphy because of her death.
• Brendan Meyer as Myles (season 1): One of the 100, who was killed by John Murphy for his part in the attempted lynching against Murphy.
• Josh Ssettuba as Connor (season 1): One of the 100, who was killed by John Murphy for his part in the attempted lynching against Murphy.

The Ark/Arkadia/Skaikru

• Sachin Sahel as Doctor Eric Jackson: Abby's helper and confidant. In the third season, he is taken over by A.L.I.E. He is freed from A.L.I.E.'s control once Clarke defeats her. In the fifth season, he has entered a relationship with Miller.
• Alessandro Juliani as Jacapo Sinclair (seasons 1–4): a technician who was a father figure and mentor to Raven. He was later killed in the third season by Emerson. He later appears in the fourth season as one of Raven's hallucinations.
• Steve Talley as Kyle Wick (seasons 1–2): An engineer who was a coworker of Raven back on the ark. They later engage in a relationship. He also became friends with Marcus Kane after he saved him. In the third season, it is mentioned that he and Raven have broken up.
• Chris Browning as Jake Griffin (season 1): Abby's husband and Clarke's father who died prior to the beginning of the series. He was executed for attempting to release critical information regarding the Ark's swiftly deteriorating life-support systems; Clarke initially blamed Wells for telling his father, before learning that her mother was responsible and Wells took responsibility to save her relationship with her mother. Clarke was accused of assisting in his crime.
• Terry Chen as Commander Shumway (season 1): Loyal to Diana Sydney. His plan to have Bellamy assassinate Jaha is later revealed, and Shumway is killed on Diana's orders.
• Kate Vernon as Diana Sydney (season 1): A former Chancellor of the Ark who was behind the assassination attempt on Jaha, having had Shumway recruit Bellamy for the job. After Abby Griffin is stripped of her council seat, it is given to Diana. She and her team steal and launch the Exodus ship to Earth, Diana painting herself as a voice of the "lower classes" who would otherwise not be given the chance to return to Earth as the Ark's resources are depleted. The ship crash lands and she is killed upon impact along with her accomplices. It is later revealed that Mount Weather caused the Exodus ship to crash.
• Kendall Cross as Major Byrne (season 2): Captain of Marcus Kane's guard at Camp Jaha. She is killed by a mutated species of carnivorous ape.
• Michael Beach as Charles Pike (season 3): An Ark survivor from Farm Station. On the Ark he was a teacher, but on Earth he is a leader in the guard and later the chancellor of Arkadia. He is captured and sent to be executed for his crimes against the Grounders. In the season finale, after assisting in defeating A.L.I.E., he is stabbed to death by Octavia to avenge Lincoln's death.
• Jonathan Whitesell as Bryan (seasons 3–4): The former boyfriend of Nathan Miller from Farm Station. He is one of the few Skaikru members who did not take A.L.I.E.'s chip to join the City of Light, and survives the battle in Polis in the season finale. In the fourth season, Bryan destroys a hydro generator in order to free some slaves and he later breaks up with Miller because he did not believe saving the slaves was the right decision.
• Donna Yamamoto as Hannah Green (season 3): Mother of Monty and an Ark survivor from Farm Station, she is under A.L.I.E.'s control and shot by Monty while trying to rescue Octavia.

Grounders

Mount Weather

• Raymond J. Barry as Dante Wallace (season 2): The leader and president of the Mount Weather colony, who favours more diplomatic attempts to use the blood of the 100 to cure his peoples' own vulnerability to radiation. He is eventually ousted from his leadership role. He is killed when Clarke shoots him in the chest.
• Eve Harlow as Maya Vie (season 2): A resident at Mount Weather who develops romantic feelings toward Jasper. Though initially unaware of Mount Weather's true intentions, she eventually realizes what is going on and assists Bellamy in his attempt to rescue the 47. She eventually joins a rebel faction of her people in hopes of overthrowing the Mount Weather government and helping Jasper. While trying to help Octavia, she is killed when Clarke releases radiation on the fifth floor.
• Rekha Sharma as Dr. Lorelei Tsing^[9] (season 2): One of the doctors at the Mount Weather colony. She uses the 47 to extract their bone marrow in order to get to the ground with no remorse. She is killed when Bellamy exposes her and several guards to radiation, and when she tries to escape via an elevator; Jasper, Monty, Miller, and Harper stop her from escaping and watch her die.
• Johnny Whitworth as Cage Wallace (season 2): The son of Dante Wallace, and the main antagonist of the second season. He works on the Cerberus Project and plans to kill the 47 to save himself and everyone else. He later betrays his father when he tries to release the 47. When his people are dying of radiation, Lincoln cuts of his hand and injects him with the Cerberus Serum, killing him.
• Ian Tracey as Vincent Vie (season 2): Maya's father who is with her on assisting the 47 and leads a rebel faction. He is killed by one of the Mount Weather guards.
• Toby Levins as Carl Emerson (seasons 2–3): A Mount Weather guard. He is captured by Clarke for information on Mount Weather but is sent back to tell Cage that she and the Grounders are coming. He is the sole surviving resident of Mount Weather, after Clarke and Bellamy irradiate the fortress and kill the rest of the Mountain Men to save the captive Arkers. He aligns himself with the Ice Nation and provides the kill codes used to blow up Mount Weather. After Roan becomes king, Emerson is given to Clarke and Lexa as a peace offering. After long consideration Clarke spares him to show the other Grounders vengeance is not the answer. He returns to seek vengeance against Clarke and her friends, but is killed by Clarke with the A.L.I.E. 2.0 chip.

City of Light

• Erica Cerra as A.L.I.E. / Becca (seasons 2–5): The avatar of an artificial intelligence who guides Jaha and Murphy to the City of Light and is the main antagonist of the third season. A.L.I.E. is responsible for causing the nuclear apocalypse 97 years ago (revealed to be on May 10, 2052). She was created by Becca (known as Pramheda, "First-commander" in Trigedasleng), who returns to Earth from a space station a few years after the nuclear apocalypse to help other survivors, and became the very first Grounder Commander. As A.L.I.E., she uses computer chips to take control of peoples minds as well as tempt others into doing her bidding such as Jaha wanting to lead his people, Raven wanting to stop feeling pain, and Ontari wanting to know the knowledge of previous commanders. She also tends to physically and psychologically harm them if they disobey her. She is destroyed by Clarke once she pulls the kill switch on her, but not before pleading to Clarke to reconsider and revealing the death wave's impending arrival. She appears briefly in flashbacks at the beginning of the fourth season when Becca makes an appearance in Raven's hallucinations.
• James Neate as Chris (seasons 2–3): One of the few scientists who helped create A.L.I.E.

Eligius

• Ivana Milicevic as Charmaine Diyoza (season 5–present): The ruthless leader of the Eligius spaceship that arrives in the Shallow Valley six years after Praimfaya. She is a former U.S. Navy SEAL Colonel-turned-terrorist who was arrested and cryogenically frozen for her crimes for over 100 years before the nuclear apocalypse that wiped out most of the population on Earth. She has escaped captivity by murdering the original captain of the Eligius ship, and has become the leader of the group of convicts aboard Elgius. She invades the Shallow Valley with her equally ruthless army and captures Clarke, but is coerced into freeing Clarke and rescuing Octavia and everyone in the bunker after being forced into a deal with Bellamy after Raven took control of the Eligius. Diyoza is revealed to be pregnant with McCreary's child, which is the only reason he spares her life after usurping leadership of the convicts.
• William Miller as Paxton McCreary (season 5): A brutal serial killer who is among those who have arrived on Earth aboard the Eligius spaceship after being cryogenically frozen for over 100 years and also has little knowledge of what happened on planet Earth after the nuclear apocalypse. He secretly wishes to replace Diyoza as leader of the convicts, but his methods demonstrate a fundamental reliance on violence, favouring killing potential enemies as the first option. He eventually usurps Diyoza but spares her life after learning she is pregnant with his daughter, and he forms tentative alliances with Clarke and Kane to win the war, though he intends to completely wipe out Wonkru. He becomes the new leader of the Eligius prisoners but is later killed by Miles Shaw and Clarke Griffin.
• Jordan Bolger as Miles Shaw (season 5–present): The pilot of the convict ship who is among those who have arrived on Earth aboard the Eligius ship. He has shown a greater willingness to negotiate with the survivors found on Earth as opposed to the convicts' willingness to kill as the first option, and he ultimately rebels against Diyoza and McCreary, allying with Echo's group to help Wonkru win the war and developing a romance with Raven.