Chris Kratt

Gourmand has a huge upper body, big and hairy arms, a small English mustache, grayish green eyes, thick and black eyebrows, a shaved head, and an abnormally large and bulbous nose with visible nostrils. He typically wears a droopy white chef's hat, a white chef's jacket, a dish rag across his belt, hiking pants, and black boots. In the episode "Rainforest Stew" also his red and white striped underwear is revealed. He often carries a quiver that holds some of his cooking utensils. When it is cold outside he wears a parka, a knit cap, and mittens, but does not change out of his dish rag, hiking pants, and black boots.

Gourmand is always confident that he will succeed, despite always being foiled by the Wild Kratts. He is clever and cunning, and has tricked and outsmarted the Wild Kratts several times. He often places the Kratt brothers in life-threatening situations, such as leaving them to be stung by African honeybees in the episode "Honey Seekers" and setting a trap with rattlesnakes in the episode "Opossum in My Pocket". His overconfidence also leads him to underestimate the creatures he hunts; when honey badgers invaded his kitchen, he attempted to scare them off by glaring at them, not realizing it's practically impossible to scare off adult honey badgers.

Gourmand enjoys bragging about his abilities and accomplishments. He claims that he never cooks the same dish twice and that his nose "can match a seasoning to anything". In the episode "The Hermit Crab Shell Exchange", Gourmand claims that he is stronger than any creature because of a special vitamin program he said he is taking.

Gourmand likes to hum and sing, although he often does so quite off-key.

Zach designed his Zachbots so that they look menacing and muscular. Zachbots have dome-shaped heads, and they have red eyes and a speaker that is supposed to look like a mouth. Their bodies are conical, which creates a "V" shape from an angle. They typically have two pincers as hands. They move by hovering.

Zachbots are jam-packed with features such as having an infinite assortment of attachments hidden inside them; their arms can extend seemingly limitlessly. They can also camouflage and disguise themselves to look like people as shown in "Let the Rhinos Roll!", when one made itself look like an African park ranger and Chris Kratt with a red shirt instead of a green one.

Zachbots appear to be very strong, able to lift large animals and instruments with ease. Zachbots can also reach extreme speeds by hovering, and apparently they have no maximum or minimum altitude in which they will stop hovering; one was shown hovering at the edge of space while spying on the Tortuga. Some Zachbots are further programmed to be extremely stealthy, allowing Zach to use them to spy on the Kratt brothers. Most Zachbots are anything but stealthy though.

Zach most often uses his Zachbots to find and collect his animal targets. He also uses them to defend himself and build some of his machines. Zach even uses them as domestic servants.

Usually, Zach brings along two Zachbots on every mission, but he can mass summon them, especially when he needs them to combat both or one of the Kratt brothers in their Creature Power Suits.

Dabio has a thick upper body and a slim lower body. He is very muscular as seen in his big arms. He is blond. He wears a turquoise t-shirt with a symbol in the middle and white pants. Between his shirt and pants is a brown belt. On his right arm, he has a brown band. He wears gray dress shoes.

Dabio has a cheerful and childish attitude. He is extremely obedient to Donita doing almost everything she tells him to, despite being mistreated by her showing he is also somewhat patient. He is also ditzy, clumsy and takes some things literally. He didn't want to harm the fire salamanders because he thought it was 'mean,' but Donita made him do it, showing that he doesn't always agree with her but is afraid of her at times. However, he still goes along with the plans of Donita regardless and is even happy to do so. Chris once stated that Dabio is 'a good guy' hinting that if he had a choice, he would be friends with the Wild Kratts, but he is stuck with Donita.

Donita is a tall and slender middle-aged woman of noticeably high stature (she's the second tallest of the villains after Dabio) with short maroon hair in an asymmetrical bob cut, golden eyes, a square face, and tan skin. Her usual attire consists of a long-sleeve reddish-pink blouse adorned with dots, with the sleeves rolled up to the elbows, along with long, blue-green earrings and high-waist umber-brown pants. She is typically seen in dark purple pointed high heels, for makeup, she wears black eyeshadow and black winged eyeliner, light brown lipstick.

Donita gets easily frustrated and angry. She treats people disrespectfully, especially her henchman Dabio, who she constantly orders around with a rude attitude. Although she is able to do her own work, she often avoids doing so because she thinks it will make her look "unfashionable". She is bossy, and she tries to make herself look superior when facing others. She is also shown to be a bit of a flirt, as seen in her debut in "Flight of the Draco", with her close interactions with Martin, referring to him as "Martino". Sometimes she even refers to Martin with his full name. While Donita admires animals for their beauty and other fashionable assets, she is quite apathetic towards their plight, only considering them to be a means to an end. Like Zach, she has an enormous ego, which makes her easy to dupe. She is also shown to be sarcastic.

Zach is a tall man with a very thin build and very pale white skin. He is barely taller than Chris. He has short shiny black hair and emerald green eyes, sporting a small goatee. He also has a wrinkle on his face. His head is triangular in shape. He wears a black turtleneck sweater, gray pants, and pointy black heeled shoes.

Zach is extremely arrogant, stubborn, and self-centered; he is also extremely narcissistic, often referring to himself as "The world's greatest mind" and programming his computers to call him "My Greatness", in spite of the fact that his inventions often fail. Zach is portrayed more comically than the other villains along with more slapstick moments; his screams are girlish, he constantly trips and falls, and he has to deal with the literal mindedness of his Zachbots. He is childish, as he often whines, gets scared, brags, and bullies, all in a very childish manner. He is also somewhat sadistic, as he has been shown to resort to outright killing the Kratt brothers, such as when he lured them into an Arctic storm and attempted to drown them. Zach fully believes his inventions are superior to Aviva's, and often employs sabotage and unfair play to prove it, only to get his comeuppance in the end and get humiliated. Zach also seems to be very interested in the Wild Kratts's Miniaturizer, having made several thwarted attempts to steal it for himself when he gets the chance.

Chris is a slim, young man of average height (he is shorter than his older brother, Martin, with a more muscular and bulkier body), tan skin, brown eyes, and short dark brown hair with the bangs spiked up. His usual attire consists of khaki shorts, hiking boots, a white undershirt and a green quarter-zip and black stripes running across the sides, with the sleeves rolled up; he typically wears his Creature Power Suit over this outfit. Chris's leg calves are not as bulkier and muscular as his brother.

Chris is very similar to his older brother, Martin. He is smart, curious, and loves making jokes and pulling pranks. But unlike his brother, Chris likes being organized, careful, responsible, and tries to carefully think things through before jumping to conclusions. He is also sometimes more technically inclined, patient, attentive, and focused than his brother, and is quick to notice details, however he can also be clueless as well.