Wild Kratts

Main

• Chris Kratt (voiced by himself) – Chris (wearing green) is the exact opposite of his brother and the more methodical brother of the two. Unlike Martin, he likes to take his time testing animals' DNA to understand the animals better and save them from the villains. Chris is organized, intellectual, and calm. He is an experienced climber, although, in one episode, he falls from a tree and develops acrophobia that later subsides. After this episode, there is a running gag that he falls from a tree unharmed.
• Martin Kratt (voiced by himself) – Martin (wearing blue) likes to give names to animals he finds, allowing the audience to bond with the animal. Martin is more the jokester of the two Kratt brothers. He is also often rushing and impulsive, unlike his younger brother, Chris. Martin is a little disorganized, emotional, and excited but knows when to be serious. In contrast to his brother Chris' climbing skills, Martin is a more experienced swimmer. He also likes to get into the mind of the animal at various times, saying such things as "Be the walrus!" He has a childish heart, due to his fun and humorous nature.
• Aviva Corcovado (voiced by Athena Karkanis) – Aviva is the leader of the Tortuga gang, second in command to Chris and Martin, but whatever it is, she is more serious than those brothers. She designs all of the inventions the Kratts use, usually inspired by nature. She is an engineer and inventor. Once she has made up her mind, it takes appealing to her emotions and overwhelming evidence to change it. She is also competitive, rivaling Zach in invention contests, the Kratts, and even nature itself, most notably in "Cheetah Racer", where she bet that she could invent a land vehicle that was faster than a cheetah, although she was proved wrong because nothing on land can outrun a cheetah. Her Creature Power Suit color is purple. For instance, she used this to become a Lawes's parotia in "Birds of a Feather", a groundhog in "Groundhog Wake Up Call", a Thomson's gazelle in "The Amazing Creature Race", and a giant female praying mantis to humiliate Zach in "Praying Mantis."
• Koki (voiced by Heather Bambrick) – As a mechanic and computer expert, Koki works on the computer database of the Tortuga HQ, researches animals for the brothers, and often uses the computer to track the villains via satellite. She manages the communications system of the Tortuga, keeping in touch with Chris and Martin throughout their missions. She sometimes receives signals from other people who want to communicate with the Wild Kratts, and intercepts signals sent by the villains to one another. She is not afraid to speak her mind and tell the truth as she sees it. Sometimes she is easily grossed out and getting nauseous, however, and had trouble researching the Tasmanian devils because of eating carcasses in the "Tazzy Chris" episode. Her Creature Power Suit colour is orange, as shown in the episodes "When Fish Fly", "A Creature Christmas", and "The Amazing Creature Race."
• Jimmy Z (voiced by Jonathan Malen) – Jimmy Z is the Shaggy Rogers/Launchpad McQuack-inspired pilot of the Tortuga HQ and operates the ship's teleporter. Jimmy is not as knowledgeable about animals as the rest of the Wild Kratts crew are and is shown to be quite nervous. He cannot live without his game controller, which he uses to teleport items and Creature Power Disks to the Kratts when they are on their adventures. He sometimes helps Aviva with inventions by handing her the items she needs as she works, and usually has hilarious results when he helps her test the prototype, such as when they were trying to figure out the formula for bioluminesce and his hair turned green in the episode "Fireflies." He does not have a Creature Power Suit, but his Creature Pod and scuba gear are both oranges. He is easily frightened. It is also revealed that he's allergic to mushrooms.

Antagonists

To foil the villains, one brother usually acts as a distraction while the other saves the animals. Other episodes have them outsmart the villains in some way. Sometimes the plot deals with one brother being captured by the villain (usually with the element of surprise on the villain's part, but sometimes due to poorly thought-out plans by the brothers themselves), and the other has to rescue him. Until "Birds of a Feather", when Aviva was kidnapped, none of the other crew members were captured by a villain without one of the Kratts present.

There are only six villains in the show, the most prominent being Zachary Varmitech. Donita Donata and her henchman Dabio are the second most recurring villain, with Gaston Gourmand being featured in some episodes. Paisley Paver and her intern Rex are the newest villains in the series. Some episodes do not feature any of the villains, however, and the primary focus is on the wildlife, its habitat, or its behaviour.

• Zachary "Zach" Varmitech (voiced by Zachary Bennett) – Zach is a robotics inventor with a vocal impression of Gilbert Gottfried, who has a rivalry with both Aviva and the Kratt brothers. He grew up alongside the Kratts and met Aviva at summer camp. He claims to be the world's greatest mind. He tries to develop hotels, vacation spots, new products and new inventions all over the world by controlling creatures' minds and using them as workers. His plans are always foiled by the Kratt Brothers. He almost always screams when he sees an animal, hinting that he has a fear of all animals. He does not know much about the animals he captures, often mispronouncing their names. Zach usually calls Martin "Blue Boy" and Chris "Green Guy," especially when they are in their Creature Power Suits. As a running gag, he calls the Kratts "Wild Rats", with the Kratts usually correcting him. Chris and Martin's rivalry with Zach is surprisingly friendly and comedic, due to the Kratt brothers' forgiving nature, even though Zach has tried to kill them several times throughout the series. He is always designing robots, usually around animals. His most frequently seen invention is the Zachbot. Although he has a house in a neighbourhood, he also has a skyscraper located in – at least, what is assumed to be – New York City (as seen in "Falcon City"). This skyscraper is where the Zachbots are produced. When travelling long distances, he uses his jet. Otherwise, he usually rides on the shoulders of a Zachbot. He is scared of the dark (as seen in "Platypus Cafe"). He gains fear of animals such as moon rats in "The Gecko Effect" and a Gila monster in "Gila Monster Under My House." His favourite soup is tomato soup, as shown in "Skunked," when he smelled it and ordered a Zachbot to retrieve it, even though it chases him when he was sprayed. In most episodes, Zach attempts to commit acts of crime, including piracy, in "The Gecko Effect", "Race for the Hippo Disc", and "Skunked"; portable hacking in "Creature Power Challenge"; attempted breaking and entering in "Bandito: The Black-Footed Ferret"; and skyjacking in "Osprey", and he acts like a hacker in "Mosquito Dragon." He has also attempted to kill the Kratts, as seen in "Polar Bears Don't Dance", "Let the Rhinos Roll", and "Creature Power Challenge". Sometimes Zach calls animals various names just because he doesn't know what they are. For instance, he calls a polar bear "Sasquatch" in "Polar Bears Don't Dance", the walruses "Seal Thingies" in "The Mystery of the Weird Looking Walrus", the hippopotamuses "Pig Thingies" in "Race for the Hippo Disc", and the tadpoles "Fish Thingies" in "Aqua Frog." He does not like it when other villains tell his Zachbots what to do as shown in the season 5 episode "Komodo Dragon" where he gets angry at Gourmand for telling his Zachbots to dig.
• Donita Donata (voiced by Eva Almos) – Donita Donata is a fashionista and is always setting trends. She travels in a pink jumbo jet and a pink boat with a pool and a lounge chair, and is never without the best comforts life can afford. Her main purpose is her clothing line, Donita Donata's Live Jewelry of Nature. She uses a paralyzing beam to freeze animals alive and sell them as jewellery or clothing. Some viewers have raised the point that the animals are still fully conscious while paralyzed. She refers to Chris as "Chrisangelo" and Martin as "Martino." She is also a bit of a flirt as seen in "Flight of the Draco".
• Dabio (voiced by Cory Doran) – Dabio is treated as a servant and fails in the simplest of tasks. He is portrayed as unintelligent to the point that he cannot function alone. He does whatever Donita tells him to do. He hardly ever speaks except to say, "Yes, Donita", and when he does, he comes across as childlike. He tries to help Donita design her fashions, but she is unsatisfied with his suggestions. Due to his perceived low intelligence, he is extremely patient and cheerful, even under Donita's dictating ways. Their relationship is loosely based on that of Yzma and Kronk in Disney's animated feature film The Emperor's New Groove.
• Gaston Gourmand (voiced by Zachary Bennett) – Gourmand is a traveling chef with a heavy Southern accent. He cooks and serves only endangered animals (except in the episode "Honey Seekers" he says that he once served an endangered mushroom salad), which has caused him to lose his chef's license and to be fired from his gourmet cooking job (as revealed in "Platypus Café"). He can pair up foods with the perfect spices by smell alone. In "Honey Seekers", he says he never cooks the same dish twice. He travels in a camper that features a fold-out restaurant, accessed by pulling a wire (although in "Stuck on Sharks", "Hermit Crab Shell Exchange", and "The Last Largest Lobster" he was depicted to be in possession of a boat featuring a built-in kitchen). When it folds out, it reveals an outdoor restaurant on a deck complete with full kitchen, at least one table, and chairs. He prefers to cook his patron's meals in front of them, and charges a heavy price for it. He also has a jet, seen in the episodes "Raptor Roundup" and "To Touch a Hummingbird." In "Platypus Cafe", he hinted at cannibalism. He calls the Kratt brothers names based on their favorite colors: Chris has been called "Green Grape", "Green Bean", and "Green Pea", while Martin suffers with "Blueberry." In several episodes Gourmand has attempted to severely injure or kill the Kratt brothers. Examples include but are not limited to "Platypus Cafe" when he attempted to serve Chris as a side dish for the platypus eggs, "Honey Seekers" when he tied the Kratts in a net next to an angry swarm of African honey bees, and "Opossum In My pocket" where Gourmand tricked the Kratts into opening a bag, releasing venomous eastern diamondback rattlesnakes, which they were rescued by the venom immunity feature in their opossum power suits.
• Paisley Paver (voiced by Julie Lemieux) – Paisley Paver is a businesswoman and the CEO of Paver Industries; she believes that turning natural landscapes into factories and parking lots (influenced by the real-world issue of urbanization) will create a better world for future generations. Paver is depicted as determined, impatient, and bossy (but still respects her intern, Rex). Her first appearance is in the Season 4 episode "Spirit Bear". She nicknames Martin "Mr. Sea Blue".
• Rex (voiced by Cory Doran) – Rex is Paisley's intern and assists her in her plots against the Wild Kratts. Although he's usually enthusiastic, Rex is still evil as he loves to operate Paisley's technology ("pavers" and construction equipment) and flatten land for her building sites.

Errors

• In the episode "Googly-Eye: The Night Guru" a brown tree snake (Boiga irregularis) is claimed to be a python, but the brown tree snake is not considered a python, and is just a colubrid snake.
• In the episode "Tenrec Treasure Hunt", Aviva says that the mouth of a river is where it begins, yet the mouth of a river is actually its terminus.
• In the Season Two episode "Happy Turkey Day" the Kratt Brothers refer to mule deer as whitetail deer.
• At the beginning of the season 5 episode "Temple of the Tigers" and the episode "Praying Mantis", a Macleay's Spectre stick insect is claimed to be a "praying mantis".
• In the episodes "Liturgusa Krattorum" (see also: Liturgusa krattorum) and "A Creature Christmas" , Shadow lives in Peru, but in the first episode that this character appears ("Shadow: The Black Jaguar"), Shadow lives in Costa Rica.