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Main Characters
Dudley Puppy
Voiced by: Jerry Trainor
The central character of the series. A dimwitted and happy-go-lucky dog who gets a job as an animal agent at T.U.F.F..- Accidental Hero: In the series' first episode, Dudley chases his chew toy, which winds up in the possession of D.O.O.M.. In the process of recovering his chew toy, Dudley manages to knock out Snaptrap's henchmen, and Snaptrap would have surrendered the Kruger Rat he had stolen to him had Dudley not had his mind more on his chew toy. When the Chief arrives at D.O.O.M. HQ, he is so impressed with what Dudley did that he hires him as an agent of T.U.F.F. and Kitty's partner.
- Ambiguously Bi: In "Freaky Spy Day", he flirts with Jack Rabbit while in Kitty's body. He eventually says he loves him.
- Ass Kicks You: He sometimes attacks enemies by smacking them with his rear end.
- Basement-Dweller: He still lives with his mom, at least before eventually moving to a treehouse (which isn't that much of an improvement, as said treehouse is still next door to his mother's house).
- Beware the Nice Ones:
- Dudley is a well-meaning, if brainless and destructive dog, but hurting his friends will get villains to surrender (as long as he notices that they're hurt). One example includes when R.I.T.A. (the toaster that Keswick invented) supposedly kills Keswick, he causes the giant robot to slip on the meatballs from cafeteria that he and Kitty were working at temporarily.
- He also hates it whenever people touch one of his chew toys without asking him. Snaptrap learned this the hard way.
- Big, Thin, Short Trio: Of the three main T.U.F.F. agents, he's the Big to Kitty's Thin and Keswick's Short.
- Cartoon Dog Breed: He's explicitly a mix of "every dog breed ever." This apparently leads to him being a plain white dog with short black ears.
- Character Catchphrase: "Hi-gee-gee!"
- Classical Anti-Hero: He means well for the most part with his only real faults being that he's an immature idiot and prone to being inconsiderate towards his partner Kitty.
- Cone of Shame: He has to wear a cone in "Dog Dish" to prevent him from scratching the rash on his butt.
- Crouching Moron, Hidden Badass: He may be a careless stooge, but his cleverly though out action skills shows that he's not 100% idiot. See Genius Ditz below.
- Disappeared Dad: There's never any mention of his dad and seeing how his mom briefly dated Snaptrap, Dudley's dad is most likely either divorced from Peg or dead.
- Disguised in Drag: His disguises occasionally have him pretending to be a woman, at one point even defending himself in court by impersonating his non-existent sister.
- Dogs Are Dumb: His whole shtick is being a canine moron. Well, almost all the time, anyway.
- Dogs Love Fire Hydrants: A frequent gag revolving around him has to do with the tendency for dogs to be associated with fire hydrants. Two particular examples are "Dudley Do-Wrong" (where he states that he likes Mayor Teddy for painting all the town's fire hydrants bright orange so they're easier to find at night) and "Dog Tired" (where he dreams about chasing an anthropomorphic fire hydrant).
- Flanderization: Dudley keeps getting more stupid throughout the series.
- Funny Animal: Dudley is a walking, talking secret agent, but still harbors affection for chewing his own butt and chew toys.
- Genius Ditz: Dudley, who seems to be little more than a hyperactive Idiot Hero, has flashes of genuine cleverness and defeats villains through outsmarting them almost as often as he out-muscles them.
- Half-Dressed Cartoon Animal: He only wears a shirt and is frequently very vocal about his aversion towards wearing pants. However, he has been okay with wearing pants as part of a disguise and in "Mom-A-Geddon", it's shown that Dudley wears underpants underneath pants that look like naked animal legs.
- Heroic Build: He is shown to have fairly impressive upper body.
- Heroic Dog: Despite his idiocy and causing problems, he does show a strong heroic side and willingness to fix his mistakes.
- Idiot Hero: The protagonist of the series who is often clever, yet rather dim.
- Innocent Blue Eyes: Dudley has blue eyes and is a rather simple-minded, yet heroic and well-meaning dog.
- Innocently Insensitive: Towards Kitty in "Diary of a Mad Cat". However, he does later mention that even he knows little as Kitty, he still wouldn't have anyone else but her as a partner.
- Jerkass Ball: Sometimes pushes the limit of how inconsiderate he can be, one moment of jackassery that stands out in particular being when he destroys Kitty's life savings to stop the Chameleon in "Sheep Dog" after using her money without her consent to perfect his disguise as a wealthy and elderly sheep woman.
- Keet: He is a very enthusiastic fella.
- Kindhearted Simpleton: Say what you will about how careless he can be, but he truly means no harm and does try to help Petropolis from doom.
- Large Ham: Being voiced by Jerry Trainor certainly helps matters.
- LEGO Genetics: Dudley is a combination of every breed of dog ever, and somehow a bit of goat. Partially justified as a long enough blood line could mix every dog breed, the goat is something else.
- Lethally Stupid: His stupidity is the cause of most of Kitty's injuries. And it's not just Kitty who's a victim of these. Very few characters are safe around Dudley.
- Mama's Boy: He still lives in the same house with his mother, Peggy, who still has quite an overprotective maternal instinct once in a while.
- Manchild: He lives in a multi-story tree house near his mom's house, and joins in with the kids when Snaptrap uses the "no hitting or killing near kids" rule to his advantage, doing kid related stuff along with crimes.
- Nice Guy: While Dudley has his flaws, he's mostly outgoing, heroic, and good-natured.
- No Indoor Voice: To the point that in one episode, they literally build a mute collar to keep him quiet.
- Puppy-Dog Eyes: He sometimes gives a sorrowful look with big eyes in response to upsetting people.
- Ship Tease: With Kitty in some episodes.
- Spanner in the Works: Dudley, who seems to be little more than a hyperactive Idiot Hero, has flashes of genuine cleverness and defeats villains through outsmarting them almost as often as he out-muscles them.
- Species Surname: A dog with the last name Puppy.
- Tiny Guy, Huge Girl: With Kitty.
- Too Dumb to Live: His stupidity would've gotten him killed lots of times if it weren't for Kitty being there to bail him out.
- Vitriolic Best Buds: With Kitty. He generally loves her as a partner, but often inadvertently injures her, though fortunately Kitty usually has no qualms against hitting him back.
- Would Hit a Girl: Dudley doesn't have any problem hitting Kitty, even kicking her in the very same episode, also being seen giving her slaps, bites and, what could be, punches.
- He also has no qualms against beating the Pageant queen to a pulp. Though, justified since he was convinced it was the Chameleon in disguise.
Kitty Katswell
Voiced by: Grey DeLisle
An actionized cat agent and Dudley's level-headed partner.- Action Girl: She is very athletic and more experienced than Dudley.
- A Dog Named "Dog": A cat named Kitty.
- Alliterative Name: Her name and surname both start with the letter "K".
- Aloof Dark-Haired Girl: Being the most composed and aloof one in the main cast comes with being the Only Sane Woman.
- Art Evolution: In the first couple of episodes her eyes are almond shaped with more defined eyelids, resembling an actual cat’s eyes. Her eyes eventually become more circular.
- Attention Deficit... Ooh, Shiny!: In spite of all her time lecturing Dudley about this, Kitty is easily distracted by cat stuff: mice, scratching posts, catnip, etc..
- Badass Adorable
- Berserk Button: A notable example would be in "Booby Trap" where Bird-Brain put her autographed poster of teen sensation Justin Timberwolf in a paper shredder.
- Big, Thin, Short Trio: Of the three main T.U.F.F. agents, she's the Thin to Dudley's Big and Keswick's Short.
- Cain and Abel: The Abel to Katty's Cain.
- Cats Are Snarkers: She's a feline and is known to make dry ribs on the incompetence and lunacy of her co-workers.
- Cats Are Superior: With Kitty, it should probably come as no surprise, as she is naturally the brains of the duo.
- The Chew Toy: Takes even more Amusing Injuries than Dudley and has lost prized possessions and even money to her partner's actions on more than one occasion. "Dead or a Lie" is a particularly striking example, where she sacrifices her week's pay, gets crushed by a sumo wrestler, sells her car and endures getting beaten up by angry children all in the name of ensuring Dudley enjoys his final moments when he's lied to her about being poisoned.
- Cute Kitten: Kitty as a kitten is just darn adorable.
- Deadpan Snarker: She frequently makes snarky remarks about Dudley's idiocy.
- Disappeared Dad: Like Dudley, her father is never acknowledged with her mother being her only appearing parent.
- Expy: Has characteristics matching Catwoman especially in Batman: Arkham City and Batman: Arkham Origins Blackgate.
- Flanderization: In season 2, Kitty keeps getting more and more childish and immature.
- Funny Animal: Kitty has little to no balance when her whiskers are cut, as the popular (but incorrect) myth states about real cats.
- Goo Goo Getup: In "Bad Eggs", she completes Dudley's disguise as a mother bird by disguising herself as an unhatched egg, which she does by hiding inside a giant egg shell while wearing a bonnet, a pink T-shirt and a diaper.
- Hartman Hips: Like a lot of females in Butch Hartman's shows, she has wide hips in contrast to her tiny waist.
- Hot-Blooded Sideburns: She has sideburns and can get quite irate.
- Identical Twin ID Tag: She differs from her evil twin sister Katty because the latter wears Institutional Apparel instead of a Spy Catsuit as well as having a white streak in her hair.
- Informed Attribute: In "Diary of a Mad Cat", there's a Running Gag where people point out Kitty's "broad shoulders".
- Informed Deformity: "Diary of a Mad Cat" reveals there’s some reason why she always wears gloves, implying it has to do with her hands, although we’ve seen her without them multiple times and they seem fine.
- Ms. Fanservice: She is quite attractive and gets a lot of moments where her curves are shown off.
- Nice Girl: Temper issues aside, Kitty is generally a pretty kind girl to be around, and even with Dudley irritating her and considering him an idiot, she still cares for him far more than any of the other agents in T.U.F.F..
- Nightmare Faces: Kitty makes these when she gets pissed off by someone or crazed up by cat products.
- Non-Mammalian Hair: She’s a cat with black hair.
- Not So Above It All: Kitty tends to act immature at times.
- Only Sane Woman: While she isn't immune to having a fair share of Not So Above It All moments, she's definitely the most mature, capable and commonsensical character in the main cast, especially considering how Dudley is overly hyperactive and a complete ditz, Keswick is high-sprung and sometimes ventures into Mad Scientist territory, and The Chief is not always as effective of a leader as he should be.
- Parental Issues: In the episode "Diary of a Mad Cat", in which Dudley leaks Kitty's diary to the entire town, we see that Kitty has some serious mommy issues. We learn from the The Chameleon shape-shifting into her mother and imitating her that she always asks Kitty when she is going to get married, why she doesn't call her on her birthday, and she will compare Kitty to her criminal sister (making her feel inferior despite the fact that she is doing much better). It's also implied that her mother comparing her and her sister makes her feel less pretty (despite the fact that they are twins who look exactly alike).
- Ship Tease: With Dudley in some episodes.
- The Smurfette Principle: Kitty is the only female in the main cast.
- Species Surname: Her last name is Katswell.
- Spy Catsuit: She wears one in "Super Duper Crime Busters!".
- Squirrels in My Pants: Dudley says Kitty's bad dancing looks like she has a hornet in her pants.
- Statuesque Stunner: Kitty is easily the tallest member of the main cast.
- Strong Family Resemblance: Kitty has her mom's face and hairstyle, although she is tall and thin while her mom is short and plump.
- Sucks at Dancing: Was a really bad one for most of the show run till she took a dance class Snaptrap was teaching.
- Tiny Guy, Huge Girl: With Dudley.
- The One Who Wears Shoes: In her case, they're Combat Stilettos.
- The Un-Favourite: Kitty's mother wishes she was more like her sister, even though said sister is a criminal.
- Vitriolic Best Buds: With Dudley. Though she always hits him back whenever Dudley (though accidentally) hurts her.
Keswick
Voiced by: Jeff Bennett
The geeky scientist of T.U.F.F..- Alien Among Us: A minor running gag has him implied to be an alien.
- All Men Are Perverts: He can be like this sometimes with girls, including Tammy.
- Big, Thin, Short Trio: Of the three main T.U.F.F. agents, he's the Short to Dudley's Big and Kitty's Thin.
- Bizarre Alien Biology: He has very strange anatomy (such as being a practically different creature during certain phases of his life cycle) and under the effect of Truth Syrup reveals that he is in fact, an alien.
- Cartoon Creature:
Word of God says, "[T.U.F.F.] always knows [Keswick] will have the answer, but they just don't know what kind of animal he is." Its revealed in a later episode that Keswick is actually part of his own species, also called Keswick. They have quite an unusual life cycle, including a 'platypus phase' where they shoot toxic quills when they hiccup. - Flanderization: Keswick eventually becomes a complete geek and a shady pervert as the series progressed.
- Gadgeteer Genius: He's made a machine that makes donuts out of thin air and redesigned D.O.O.M.'s lair using soup cans and a shark tank.
- Hollywood Autism: Keswick displays the classic traits of what was deemed as "high-functioning" autism as he tends to be unaware of what's socially appropriate, is very sensitive to stimuli, has a special interest in science, savantlike capabilities in mathematics, technology, chemistry, genetics, etc., and can be prone to meltdowns as he gets "pretty weird" when he could not cope unless he had social contact. He also memorized the streets of the city in alphabetical order.
- Last of His Kind: Possibly, since he is part of his own species. Part of their life cycle is growing a reptilian tail that will eventually break off and becoms another Keswick, who they then must fight to the death. This is contradictory to previous and subsequent episodes featuring his parents and his brother-in-law.Keswick: There Can Be Only One.
- LEGO Genetics: Keswick has gills, webbed feet, lays eggs, has a pouch, and who knows what else.
- Lovable Nerd: A short, socially awkward scientist who stutters a lot.
- Mad Scientist: He creates gadgets for T.U.F.F. and is often shown to be a bit on the nutcase side.
- Nerdcore: Keswick is shown to love rap/hip-hop as he enjoys playing the character of a hip, street smart robot sidekick and even spits a good rap!
- No Celebrities Were Harmed: Keswick is a straight up parody of Jerry Lewis.
- The One Who Wears Shoes: He is one of the few characters in the series who wears shoes.
- The Smart Guy: He usually provides the information and the gadgets for T.U.F.F..
- Speech Impediment/Verbal Tic: Keswick stutters a lot.
Herbert "The Chief" Dumbrowski
Voiced by: Daran Norris
The flea leader of T.U.F.F. and a former agent himself.- Artificial Limb: The Chief has a bionic foot that makes him even cooler than he is already.
- False Teeth Tomfoolery: His teeth are revealed to be dentures in "Internal Affairs".
- Flanderization: The Chief becomes more cowardly and immature.
- Four-Legged Insect: He's an insect who has four limbs and is bipedal.
- Hair Today, Gone Tomorrow: It is shown that he used to have a full head of hair in his days as a T.U.F.F. agent.
- Lethal Chef: He tries to make pies in "Dog Daze". According to Keswick, they taste terrible.
- Mr. Vice Guy: The Chief is a little rough and gruff and can be a bit bossy on occasions but it's never to a point where he comes off as a jerk. He's actually a good-hearted Nice Guy and has deep respect for his agents (who all respect him in return).
- The Peter Principle: It's implied this at work with him. He's shown to have been a very good agent back when he was active in field work but those skills didn't necessarily translate well into leadership.
- Pint-Sized Powerhouse: He's extremely strong for somebody so small.
- Pointy-Haired Boss: Could qualify. Although he has extreme strength for his size and is good in a direct fight with villains, he doesn't seem to actually have the skills needed to lead a spy organization. Heck, there are times where he comes off as so stupid that he makes Dudley look smarter.
- Real Men Wear Pink: In "The Rat Pack", it's revealed that he reads romance novels, though he tries to deny it and say it's hard-boiled detective fiction.
- Retired Badass: The Chief was once T.U.F.F.'s top agent and an amazing fighter. In one episode, he comes out of retirement to help Dudley deal with the Chameleon. While things don't work out well at first, Dudley manages to give him a pep talk and he shows he's still got it by beating up the Chameleon.
- Your Size May Vary: His exact size varies between being knee-high to Keswick and being small to the extent of being barely visible from a distance like fleas are in real-life.
Villains
Verminious Snaptrap
Voiced by: Maddie Taylor
The rat leader of D.O.O.M..- Accidental Dance Craze: In "Dog House", Snaptrap (undercover) gets scorpions in his pants and reacts in pain that appears as if he's dancing when he's not.
- Basement-Dweller: He is sometimes shown to be living in his mother's basement.
- Big Bad Wannabe: His very first appearance has him talk himself up as if he were the biggest threat in the series, only for it to turn out no one has heard of him. Overall, he's portrayed far more as an Ineffectual Sympathetic Villain than a genuine threat.
- Character Catchphrase: "It is I, Verminious Snaptrap!" and "I shall now plot my revenge!" He also often ends conversations with "Snaptrap out!".
- "Start the car Larry!" whenever committing an act of petty theft.
- "[Insert random demand here], OR PERISH!!!"
- "Start the car Larry!" whenever committing an act of petty theft.
- Deadpan Snarker: Has his moments of making sarcastic comments, especially when Larry in involved.
- Even Evil Has Loved Ones: In "Snap Dad", Snaptrap agrees to give up his his evil ways when he falls in love with Dudley's mother Peg. However, his tenure as a T.U.F.F. agent is foiled due to him being a kleptomaniac Jerkass and generally incompetent as a good guy. At one point, he finds that the Petropolis bank is being robbed by his former D.O.O.M. teammates. Although he has no problem with blasting Larry, he can't bring himself to blast Ollie and Francisco. He tells Dudley and Kitty that Ollie and Francisco are like family to him, due to the former having brought him stolen comic books when he had his wisdom teeth removed, and the latter apologizing for eating Li'l Snappy, his pet hamster he lost. As a result, he lets them get away with their stolen money.
- Even Evil Has Standards:
- According to "Operation: Happy Birthday", Snaptrap would never kill anybody on their birthday without letting them celebrate it first. "No one's THAT evil!"
- When Snaptrap asks for suggestions on how to get revenge on the "meanies" at the monotrail for not letting them ride in "Forget Me Mutt", Francisco suggests that they eat them. Snaptrap flat-out states "that's just dark and disturbing".
- The reason why Snaptrap tells the agents his latest plan is because he considers it rude not to.
- The Weasel is the one criminal in Petropolis that even he is scared of.
- Evil Counterpart: He easily qualifies as a villainous equivalent to Dudley, being just as stupid and immature as he is.
- Evil Is Hammy: He constantly speaks really loudly. In one episode, he even begins to wonder if his voice has become irritating.
- Evil Is Petty: In addition to doing things that qualify as evil, most of Snaptrap's actions seem to Poke the Poodle.
- Falsely Reformed Villain: His plan in "Mall Rat" involves pretending to reform.
- Freudian Excuse: Might qualify considering all the hints dropped on the show about his mother being abusive, and how much he hates her.
- Ironic Allergy: He is a rat who is severely allergic to cheese, which gives him massive swelling if he comes in contact with it. He says he is well aware of the irony.
- Jerkass to One: He has genuine friendships with the members of D.O.O.M. besides Larry, who he constantly abuses. At one point where Snaptrap works as a T.U.F.F. agent and has to fight his former teammates, he admits he is fine with shooting Larry (and then does just that) but refuses to shoot Ollie and Francisco.
- Laughably Evil: Some of his schemes are so pathetic it's funny.
- Never My Fault: He is prone to blame anyone for his dumber ideas except for himself, particularly in "Guard Dog".
- No Celebrities Were Harmed: Snaptrap's voice is an impersonation of Ed Wynn.
- Pointy-Haired Boss: Half the time, one would get the impression that D.O.O.M. would've won by now if it weren't for Snaptrap's incompetence.
- Psychopathic Manchild: Most of his schemes are very petty and childish. For example, he tried to blow up the sun in "Really Big Mission" just to make popcorn, while "Agent of the Year" had him intend to blow up the public pool in protest of adult swim (when Larry pointed out to Snaptrap that he is an adult, Snaptrap gave the excuse that he isn't an adult emotionally).
- Rodents of Unusual Size: He's a rat as tall as Agents Puppy and Katswell.
- Speech Impediment: Has a lisp.
- Token Evil Teammate: During his brief tenure as a T.U.F.F. Agent in "Snap Dad".
- Too Dumb to Live: Is a mild example, particularly in "Mission: Really Big Mission" where his get rich quick scheme for the episode will also destroy the entire planet. Even The Chameleon calls him out on his embarrassing case of Didn't Think This Through.
- Vocal Evolution: His voice was initially a bit deeper, but cracked constantly - but by the end of the first season his voice became more consistently high-pitched, lessening the Ed Wynn aspect of his voice.
- You Dirty Rat!: He's a giant rat who serves as the leader of D.O.O.M..
- Zany Scheme: A Running Gag has Ollie think Snaptrap is doing one of these only for it to turn out he is doing something more mundane, like thinking they are searching T.U.F.F.'s dumpster for discarded inventions when Snaptrap really just mistook it for a restaurant's dumpster to find leftovers from.
Larry
Voiced by: Jeff Bennett
A shrew who is Snaptrap's brother-in-law and one of Snaptrap's henchmen.- Ambiguously Jewish: He shows a lot of Jewish stereotypes. He has a big nose, balding hair, looks nerdy, is married to a Christian (Snaptrap's sister), and is always arguing or complaining with Snaptrap.
- Big, Thin, Short Trio: He's the Short to Francisco's Big and Ollie's Thin.
- Butt-Monkey: Snaptrap always likes to harm Larry whenever he gets mad. See The Chew Toy down below.
- The Chew Toy: He suffers a series of Amusing Injuries in almost every episode, especially being launched into Snaptrap's Shark Pool.
- Even Bad Men Love Their Mamas: When the other members of D.O.O.M. complain about how they hate being ordered around by their mothers in "Mom's Away", Larry brings up that he actually loves his mother unconditionally. Unsurprisingly, this prompts Snaptrap to abuse him yet again.
- Half-Dressed Cartoon Animal: He wears a shirt but no pants.
- Hypercompetent Sidekick: He serves as this to Snaptrap, especially in "Doom and Gloom", when he points out that the reason they keep getting arrested is because he keeps telling T.U.F.F. their plans.
- Mistreatment-Induced Betrayal: In "Doom and Gloom", he turns against Snaptrap and takes over D.O.O.M., renaming it G.L.O.O.M. (Genius Larry's Order of Mayhem), comitting crimes without telling T.U.F.F. his plans, and renaming himself "Murray".
- Obnoxious In-Laws: He is Snaptrap's brother-in-law, frequently bickers with Snaptrap and is often on the receiving end of abuse from Snaptrap.
Ollie
Voiced by: Jeff Bennett
A British opossum who is one of Snaptrap's henchmen.- Affably Evil: Despite being a member of D.O.O.M., he is one of the most polite characters on the show.
- Big, Thin, Short Trio: He's the Thin to Francisco's Big and Larry's Short.
- Cloud Cuckoolanders Minder: He generally persuades his boss Snaptrap to carry out evil schemes that are actually useful rather than pointlessly selfish and/or non-threatening.
- Evil Brit: He's a British opossum who works for D.O.O.M..
- Fauxreigner: In "True Spies", he confesses while under the effects of Truth Syrup that he's feigning the accent and isn't really British.
- Informed Species: Despite being a British opossum, Ollie looks more like a weasel or a brown rat.
Francisco
Voiced by: Daran Norris
An alligator who is one of Snaptrap's henchmen.- Big, Thin, Short Trio: He's the Big to Ollie's Thin and Larry's Short.
- Green Gators: He's an alligator with green scales.
- Half-Dressed Cartoon Animal: He wears a shirt but no pants.
- Never Smile at a Crocodile: He's an alligator and a D.O.O.M. agent.
The Chameleon
Voiced by: Daran Norris
- Accidental Misnaming: His debut episode has everyone, including himself keep mispronouncing his name. ("It is I, the Camolee-on!")
- Attention Deficit... Ooh, Shiny!: Has a hard time focusing on his schemes over his stomach. Especially when ladybugs are involved.
- Ax-Crazy: He's a little bit...off. Especially given that some of his schemes involve gleefully blowing things/people up.
- Character Catchphrase: "It is I, The Chameleon!"
- Even Evil Has Standards: Despite all of his evil schemes, destroying the Earth is off-limits. In "Mission: Really Big Mission", he calls out all of D.O.O.M. as their poorly-thought out plan will destroy the planet.
- Freudian Excuse: He's a villain due to being a social outcast.
- The Friend Nobody Likes: Whenever he teams up with Snaptrap and Bird Brain, they tend to treat him like dirt. This is best exemplified in "Dead or a Lie", where his going along with Dudley's lie that he poisoned the cupcakes Dudley ate earns him Snaptrap and Birdbrain's respect, but they both turn on the Chameleon after they find out Dudley wasn't really poisoned.
- Hollywood Chameleons: More of Voluntary Shapeshifting than blending into backgrounds, he can use his suit to change into other people.
- Lorre Lookalike: His accent and giant, bulging eyes are clearly based on Peter Lorre.
- Not Even Bothering with the Accent: Despite having the ability to transform into anyone, he (usually) still uses his normal voice, occasionally spouting out random phrases related to his disguise.
- Overly-Long Tongue : A real chameleon's tongue is twice the length of its body, but The Chameleon's tongue is shown to go beyond that several times due to Rule of Funny.
- Playing Both Sides: In "Share-a-Lair", he successfully tricks T.U.F.F. and D.O.O.M. into continually assaulting each other as their newest field agents, and nearly does the same as the real estate agent for the only building left in Petropolis.
- Running Gag: Because of his bulbous eyes, he's unable to use eyewear properly.
- Reptiles Are Abhorrent: He's a villainous reptile.
- Shapeshifting Sound: His suit makes a zapping sound when he uses it to transform.
- Voluntary Shapeshifting: His transformation suit lets him take on any form he wants.
- Would Hit a Girl: His first appearance his him trying to get revenge on Kitty, even successfully taking most of her nine lives.
Bird Brain
Voiced by: Rob Paulsen
- Animal Gender-Bender: He has laid eggs for comedic effect.
- Bald of Evil: He is a balding villain.
- Duck!: A running gag with many of his minions, including a duck named Duck (who is temporarily renamed Skip to avoid confusion with the command to duck, only for the rest of his minions to then mistake the utterance of his name for a command to skip). In "Bad Eggs", he shows an application form for being one of his henchmen, which includes a space for "weird name".
- Evil Counterpart: The fact that he's highly intelligent, something of a social outcast and is the only known specimen of his species makes him an evil counterpart to T.U.F.F.'s nerdy tech expert Keswick.
- Furry Baldness: He has a balding appearance in spite of his hairless scalp being blue like the rest of his feathered body.
- Hair Today, Gone Tomorrow: It is sometimes brought up that he used to have a full head of hair.
- High-Class Glass: He wears a monocle to highlight his sophisticated nature.
- Ironic Name: His name is Bird Brain when he is an evil genius and the phrase "bird brain" is commonly used as an insult towards unintelligent people.
- Last of His Kind: He uses his status as the last existing blue-bottomed boobie to his advantage in "Booby Trap" (after sending another of his kind away on a rocket to ensure he truly is the only one of his kind) to protect himself from T.U.F.F. Until he violates this by creating a giant mutant boobie, therefore no longer protected by the law for being the last one, despite the fact that in real life, he'd still be protected for being an endangered species.
- Mad Scientist: Whether it be creating a cannon that creates thunder to a giant clone of himself, science is involved in his evil schemes someway or another.
- Minion with an F in Evil: His henchmen Owl and Bat, that usually respond with "Who?" and "Where?", which usually results in Who's on First? moments.
- My Brain Is Big: He's an intellectual villain with a huge, round cranium.
- Only Sane Man: When you compare him to Snaptrap and The Chameleon, he's a fairly competent villain.
- Rail Enthusiast: He really likes taking the bus and he even memorized different bus schedules. Only because he can't fly.
- Remember the New Guy?: Dudley and Kitty have already been acquainted with him by the time he's encountered in "Mom-A-Geddon", his first appearance.
- Surrounded by Idiots: He expresses exasperation at cohort incompetence and stupidity not only when dealing with his henchmen, but when he teams up with Snaptrap and The Chameleon.
- Younger Than They Look: According to "A Doomed Christmas" he's 23, though that doesn't stop everyone else from thinking otherwise.
Jack Rabbit
Voiced by: Daran Norris
- Barefoot Cartoon Animal: He's a cartoon rabbit who goes barefoot.
- Fallen Hero: He was a former T.U.F.F. agent, but he now makes a living stealing secret information.
- Faux Affably Evil: He gets his way by using his "charms" to get people on his side and then take advantage of them.
- The Name Is Bond, James Bond: As with any James Bond parody, he introduces himself by saying his last name and then his full name.
- Punny Name: His name is Jack Rabbit, he's a rabbit, and there is an actual animal called jackrabbit.
- Species Surname: A rabbit with the last name Rabbit.
- Tuxedo and Martini: He's a very blatant James Bond pastiche, to the point that he gets a Bond Gun Barrel sequence, introduces himself by saying his surname and then his full name and has a voice that's a clear impersonation of Sean Connery.
Quacky the Duck
Voiced by: Maddie Taylor
- Depraved Kids' Show Host: He turned to villainy after his show got canceled, and thus commits crimes while still acting out his kid-friendly persona.
- Excited Kids' Show Host: He even continues to act like this after he gets arrested, though he's considerably calmer.
- Early-Bird Cameo: Is mentioned and shows up on television a few times before he becomes a supervillain.
- Face–Heel Turn: He turns evil after his show gets cancelled by the network president.
- Falsely Reformed Villain: Most of his latter plans include pretending to go straight and open some kind of business.
- Flaw Exploitation: Is entirely aware that Dudley's an idiot, and often uses it to his advantage.
- No Celebrities Were Harmed: Quacky's voice is an impersonation of Bobcat Goldthwait.
- Paper-Thin Disguise: When attempting to disguise himself as someone else, he does an extremely horrible job at hiding who he is. T.U.F.F. believes him anyway.
- Serious Business: His Show Within a Show is insanely popular. Even after he gets arrested, he's so famous he's able to become a Villain with Good Publicity with almost no effort.
- Suspiciously Specific Denial: A running gag has him unconvincingly lie that he isn't planning anything evil whenever he has a new scheme in the works. Lucky for him, Dudley's a moron.
- Villain Has a Point: Kitty expresses her disappointment at him dropping Grammar Gopher from his show due to him being her favorite character in "Lucky Duck", but later concedes that Quacky made the right call by firing him when she herself gets annoyed by Grammar Gopher correcting her grammatical errors.
The Sharing Moose
Voiced by: Jeff Bennett
- The Brute: He does the heavy lifting for Quacky.
- The Dragon: He is Quacky's main helper and muscle.
- Half-Dressed Cartoon Animal: He doesn't wear anything besides a shirt.
- Odd Name Out: Among Quacky's co-hosts, the Sharing Moose is the only one whose name is not even phonetically alliterative.
F.L.O.P.P.
Voiced by: Daran Norris (Meerkat), Jerry Trainor (Wanna-Bee), Maddie Taylor (Escape Goat)
- Character Catchphrase: Wanna-Bee has a tendency to describe things as "super bad".
- Chuck Cunningham Syndrome: Fidder Crab is not seen after "Top Dog"
- Even Evil Has Standards: They thought pushing all the buttons in a crowded elevator was too far.
- Goldfish Poop Gang: Big time. If it weren't for having the good fortune of getting their hands on dangerous technology once in a while, they'd make D.O.O.M. look like a completely serious threat.
- No Celebrities Were Harmed: Meerkat's voice is a Paul Lynde impression. Escape Goat's voice an impression of Paul Reubens' character Pee-wee Herman.
- Not-So-Harmless Villain: In most of their appearances, they've managed to become a threat once using stolen technology (usually something Snaptrap carelessly left at the golf course).
The Caped Cod
Voiced by: Chris Parnell ("The Dog Who Cried Fish"), Mick Wingert ("Cold Fish" onward)
- Authority in Name Only: His "kingdom" is just a bunch of trash he believes are his subjects.
- Cloudcuckoolander: Aside from spending a lot of his time talking to literal garbage, he's under the delusion that Dudley is king of the surface world and tries to overthrow his non-existent rule.
- No Cartoon Fish: His biggest problem is that he doesn't realize he is the only exception in a show that otherwise plays this straight.
- Too Dumb to Live: He continues to have the Seal of Approval as his henchman in spite of his lackey repeatedly trying to eat him.
Katty Katswell
Voiced by: Grey DeLisle
- Even Bad Men Love Their Mamas: One reason her mother views her more favorably than Kitty is that she used her one phone call to call her mother on her birthday.
- Evil Twin: She is Kitty's twin sister and a criminal.
- Identical Twin ID Tag: She looks just like her sister Kitty, except with a white streak in her hair and wearing a striped convict uniform instead of a Spy Catsuit.
- Institutional Apparel: Aside from disguising herself as her sister by taking her clothes, the only clothing Katty is shown wearing is a striped convict uniform.
- Monster of the Week: The only time she appears physically is in "A Tale of Two Kitties", where she is the antagonist.
- One Phone Call: One reason Mrs. Katswell views Katty more favorably than Kitty is because Katty used her one phone call to call Mrs. Katswell on her birthday.
- Twin Switch: Her plan to steal the golden fishbowl involves impersonating her sister while having her take her place in prison by switching their uniforms and using spray paint so that Katty's white streak is covered up and Kitty's hair has a white streak added.
- Unseen No More: Physically appears in "A Tale of Two Kitties" when previously she was only mentioned in "Diary of a Mad Cat" and "Bluff Puppy".
Other
Peg Puppy
Voiced by: Leslie Carrara-Rudolph
- Alliterative Name: Her name and surname both start with the letter "P".
- Miniature Senior Citizens: Her son is an adult and she is way smaller than he is.
- My Beloved Smother: Dudley is frequently annoyed by his mother's nagging.
- Parent with New Paramour: In "Snap Dad", she dates Snaptrap, a development Dudley isn't too happy about. The episode ends with her dating the Chameleon, which elicits a similar reaction from Dudley.
- Species Surname: She's a dog and Dudley's mom so of course her last name is Puppy.
Tammy
Voiced by: Grey DeLisle
- Hartman Hips: She has wide hips.
- Hyper-Competent Sidekick: She is this in secretary form as she's the one who keeps everything running in T.U.F.F. as seen in the episode, 'Organized Crime'.
- Only Sane Woman: Along with Kitty, she's one of the few consistently competent employees of T.U.F.F.
- Righteous Rabbit: A rabbit working for T.U.F.F.
- Ship Tease: With Keswick.
- Southern Belle: She's an attractive woman with a Southern accent.
Eric
Kitty's secret crush.
- Hidden Depths: He is actually madly in love with Kitty. He is independently wealthy and only took the job as a water delivery guy to be close to her. In one episode, Dudley (who is able to briefly tell the future) says that Kitty and Eric do get married in the future but there is a hidden secret to him that she ought to know. Neither Kitty or the audience figure out what that secret is.
- Mr. Fanservice: Sort of. He doesn't get many Shirtless Scene but he is a very handsome guy.
- Nice Guy: He appears to be quite pleasant and polite as well as understanding.
- Satellite Love Interest: He mainly exists for Kitty's affections.
Mrs. Katswell
Kitty's mother.
- Abusive Parent: In "Diary of a Mad Cat" we see that she makes Kitty feel inferior especially when she is compared to her criminal twin sister.
- Parental Issues: Kitty seems to have some serious mommy issues and as shown in "Diary of a Mad Cat", it's not hard to see why.
Daisy
Dudley's new girlfriend. She only appears in the episode of "Girlfriend or Foe" but the two do remain together even by the end of the episode.
- Dumb Blond: She plays this trope to a T. She's blonde and about as much of an idiot as Dudley.
- Expy: Basically a female equivalent of Dudley in every way.
- Kindhearted Simpleton: She gets her words mixed up very easily and is very sweet, bubbly, and friendly
- Nice Girl: It's pretty easy to see why Dudley likes her so much.
