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[[foldercontrol]]
!!Main Characters
[[folder:Dudley Puppy]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_dudley.png]]
->'''Voiced by''': Creator/JerryTrainor
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..
----
* AccidentalHero: 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.
* AmbiguouslyBi: In "Freaky Spy Day", he flirts with Jack Rabbit while in Kitty's body. He eventually says he ''loves'' him.
* AssKicksYou: He sometimes attacks enemies by smacking them with his rear end.
* BasementDweller: 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).
* BewareTheNiceOnes:
** 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) [[spoiler: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.
* BigThinShortTrio: Of the three main T.U.F.F. agents, he's the Big to Kitty's Thin and Keswick's Short.
* CartoonDogBreed: He's explicitly a mix of "every dog breed ever." This apparently leads to him being a plain white dog with short black ears.
* CharacterCatchphrase: "Hi-gee-gee!"
* ClassicalAntiHero: 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.
* ConeOfShame: He has to wear a cone in "Dog Dish" to prevent him from scratching the rash on his butt.
* CrouchingMoronHiddenBadass: He may be a careless stooge, but his cleverly though out action skills shows that he's not 100% idiot. See GeniusDitz below.
* DisappearedDad: 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.
* DisguisedInDrag: His disguises occasionally have him pretending to be a woman, at one point even defending himself in court by [[ItMakesSenseInContext impersonating his non-existent sister]].
* DogsAreDumb: His whole shtick is being a canine moron. Well, almost all the time, anyway.
* DogsLoveFireHydrants: 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.
* FunnyAnimal: Dudley is a walking, talking secret agent, but still harbors affection for chewing his own butt and chew toys.
* GeniusDitz: Dudley, who seems to be little more than a hyperactive IdiotHero, has flashes of genuine cleverness and defeats villains through outsmarting them almost as often as he out-muscles them.
* HalfDressedCartoonAnimal: 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 [[FurIsClothing pants that look like naked animal legs]].
* HeroicBuild: He is shown to have fairly impressive upper body.
* HeroicDog: Despite his idiocy and causing problems, he does show a strong heroic side and willingness to fix his mistakes.
* IdiotHero: The protagonist of the series who is often clever, yet rather dim.
* InnocentBlueEyes: Dudley has blue eyes and is a rather simple-minded, yet heroic and well-meaning dog.
* InnocentlyInsensitive: Towards Kitty in "Diary of a Mad Cat". However, he does later mention that even he knows little as Kitty, [[Heartwarming/TUFFPuppy he still wouldn't have anyone else but her as a partner]].
* JerkassBall: 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.
* KindheartedSimpleton: Say what you will about how careless he can be, but he truly means no harm and does try to help Petropolis from doom.
* LargeHam: Being voiced by Creator/JerryTrainor certainly helps matters.
* LegoGenetics: 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.
* LethallyStupid: His stupidity is the cause of most of [[TheChewToy Kitty's]] injuries. And it's not just Kitty who's a victim of these. Very few characters are safe around Dudley.
* MamasBoy: 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.
* NiceGuy: While Dudley has his flaws, he's mostly outgoing, heroic, and good-natured.
* NoIndoorVoice: To the point that in one episode, they literally build a mute collar to keep him quiet.
* PuppyDogEyes: He sometimes gives a sorrowful look with big eyes in response to upsetting people.
* ShipTease: With Kitty in some episodes.
* SpannerInTheWorks: Dudley, who seems to be little more than a hyperactive IdiotHero, has flashes of genuine cleverness and defeats villains through outsmarting them almost as often as he out-muscles them.
* SpeciesSurname: A dog with the last name Puppy.
* TinyGuyHugeGirl: With Kitty.
* TooDumbToLive: His stupidity would've gotten him killed lots of times if it weren't for Kitty being there to bail him out.
* VitriolicBestBuds: 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.
* WouldHitAGirl: 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.
[[/folder]]

[[folder:Kitty Katswell]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_kitty_3.jpg]]
->'''Voiced by''': Creator/GreyDeLisle
An actionized cat agent and Dudley's level-headed partner.
----
* ActionGirl: She is very athletic and more experienced than Dudley.
* ADogNamedDog: A cat named Kitty.
* AlliterativeName: Her name and surname both start with the letter "K".
* AloofDarkHairedGirl: Being the most composed and aloof one in the main cast comes with being the OnlySaneWoman.
* ArtEvolution: 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.
* AttentionDeficitOohShiny: [[NotSoAboveItAll In spite of all her time lecturing Dudley about this,]] Kitty is easily distracted by cat stuff: mice, scratching posts, catnip, etc..
* BadassAdorable
* BerserkButton: A notable example would be in "Booby Trap" where Bird-Brain put her autographed poster of teen sensation [[Music/JustinTimberlake Justin Timberwolf]] in a paper shredder.
* BigThinShortTrio: Of the three main T.U.F.F. agents, she's the Thin to Dudley's Big and Keswick's Short.
* CainAndAbel: The Abel to Katty's Cain.
* CatsAreSnarkers: She's a feline and is known to make dry ribs on the incompetence and lunacy of her co-workers.
* CatsAreSuperior: With Kitty, it should probably come as no surprise, as she is naturally the brains of the duo.
* TheChewToy: Takes even more AmusingInjuries 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.
* CuteKitten: Kitty as a kitten is just darn adorable.
* DeadpanSnarker: She frequently makes snarky remarks about Dudley's idiocy.
* DisappearedDad: Like Dudley, her father is never acknowledged with her mother being her only appearing parent.
* {{Expy}}: Has characteristics matching Catwoman especially in ''VideoGame/BatmanArkhamCity'' and ''VideoGame/BatmanArkhamOriginsBlackgate''.
* {{Flanderization}}: In season 2, Kitty keeps getting more and more childish and immature.
* FunnyAnimal: Kitty has little to no balance when her whiskers are cut, as the popular (but incorrect) myth states about real cats.
* GooGooGetup: 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.
* HartmanHips: Like a lot of females in Butch Hartman's shows, she has wide hips in contrast to her tiny waist.
* HotbloodedSideburns: She has sideburns and can get quite irate.
* IdenticalTwinIDTag: She differs from her evil twin sister Katty because the latter wears InstitutionalApparel instead of a SpyCatsuit as well as having a white streak in her hair.
* InformedAttribute: In "Diary of a Mad Cat", there's a RunningGag where people point out Kitty's "broad shoulders".
* InformedDeformity: "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.
* MsFanservice: She is quite attractive and gets a lot of moments where her curves are shown off.
* NiceGirl: 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..
* [[NightmareFace Nightmare Faces]]: Kitty makes these when she gets [[BerserkButton pissed off by someone]] or [[NotSoAboveItAll crazed up]] by [[AttentionDeficitOohShiny cat products]].
* NonMammalianHair: She’s a cat with black hair.
* NotSoAboveItAll: Kitty tends to act immature at times.
* OnlySaneWoman: While she isn't immune to having a fair share of NotSoAboveItAll 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 MadScientist territory, and The Chief is not always as effective of a leader as he should be.
* ParentalIssues: 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).
* ShipTease: With Dudley in some episodes.
* TheSmurfettePrinciple: Kitty is the only female in the main cast.
* SpeciesSurname: Her last name is ''[[PunnyName Kat]]''[[PunnyName swell]].
* SpyCatsuit: She wears one in "Super Duper Crime Busters!".
* SquirrelsInMyPants: Dudley says Kitty's [[SucksAtDancing bad dancing]] looks like she has a hornet in her pants.
* StatuesqueStunner: Kitty is easily the tallest member of the main cast.
* StrongFamilyResemblance: Kitty has her mom's face and hairstyle, although she is tall and thin while her mom is short and plump.
* SucksAtDancing: Was a really bad one for most of the show run till she took a dance class Snaptrap was teaching.
* TinyGuyHugeGirl: With Dudley.
* TheOneWhoWearsShoes: In her case, they're CombatStilettos.
* TheUnfavourite: Kitty's mother wishes she was more like her sister, even though said sister is a criminal.
* VitriolicBestBuds: With Dudley. Though she always hits him back whenever Dudley (though accidentally) hurts her.
[[/folder]]

[[folder:Keswick]]
[[quoteright:270:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_keswick_3262.jpg]]
->'''Voiced by''': Creator/JeffBennett
The geeky scientist of T.U.F.F..
----
* AlienAmongUs: A minor running gag has him implied to be an alien.
* AllMenArePerverts: He can be like this sometimes with girls, [[StalkerWithACrush including Tammy]].
* BigThinShortTrio: Of the three main T.U.F.F. agents, he's the Short to Dudley's Big and Kitty's Thin.
* BizarreAlienBiology: 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.
* CartoonCreature: WordOfGod 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.
%%* DeadpanSnarker
* {{Flanderization}}: Keswick eventually becomes a complete geek and a shady pervert as the series progressed.
* GadgeteerGenius: 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.
* HollywoodAutism: 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.
* LastOfHisKind: 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:''' ThereCanBeOnlyOne.
* LegoGenetics: Keswick has gills, webbed feet, lays eggs, has a pouch, and who knows what else.
* LovableNerd: A short, socially awkward scientist who stutters a lot.
* MadScientist: 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!
* NoCelebritiesWereHarmed: Keswick is a straight up parody of Creator/JerryLewis.
* TheOneWhoWearsShoes: He is one of the few characters in the series who wears shoes.
* TheSmartGuy: He usually provides the information and the gadgets for T.U.F.F..
* SpeechImpediment[=/=]VerbalTic: Keswick stutters a lot.
[[/folder]]

[[folder:Herbert "The Chief" Dumbrowski]]
[[quoteright:332:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_chief_9265.jpg]]
->'''Voiced by''': Creator/DaranNorris
The flea leader of T.U.F.F. and a former agent himself.
----
* ArtificialLimb: The Chief has a bionic foot that makes him even cooler than he is already.
%%* DaChief
* FalseTeethTomfoolery: His teeth are revealed to be dentures in "Internal Affairs".
* {{Flanderization}}: The Chief becomes more cowardly and immature.
* FourLeggedInsect: He's an insect who has four limbs and is bipedal.
* HairTodayGoneTomorrow: It is shown that he used to have a full head of hair in his days as a T.U.F.F. agent.
* LethalChef: He tries to make pies in "Dog Daze". According to Keswick, they taste terrible.
* MrViceGuy: 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 NiceGuy and has deep respect for his agents (who all respect him in return).
* ThePeterPrinciple: 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.
* PintSizedPowerhouse: He's extremely strong for somebody so small.
* PointyHairedBoss: Could qualify. [[ThePeterPrinciple 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]] ''[[ThePeterPrinciple lead]]'' [[ThePeterPrinciple a spy organization.]] Heck, there are times where he comes off as so stupid that he makes ''Dudley'' look smarter.
* RealMenWearPink: 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.
* RetiredBadass: 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 [[StillGotIt he's still got it]] by beating up the Chameleon.
* YourSizeMayVary: 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.
[[/folder]]

!Villains
[[folder:Verminious Snaptrap]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_verminous_snaptrap_2945.jpg]]
->'''Voiced by''': Maddie Taylor
The rat leader of D.O.O.M..
----
* AccidentalDanceCraze: In "Dog House", Snaptrap (undercover) gets [[SquirrelsInMyPants scorpions in his pants]] and reacts in pain that appears as if he's dancing when he's not.
* BasementDweller: He is sometimes shown to be living in his mother's basement.
* BigBadWannabe: 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 IneffectualSympatheticVillain than a genuine threat.
* CharacterCatchphrase: "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!!!"
* DeadpanSnarker: Has his moments of making sarcastic comments, especially when Larry in involved.
* EvenEvilHasLovedOnes: 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 [[HeroWithAnFInGood 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.
* EvenEvilHasStandards:
** 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.
* EvilCounterpart: He easily qualifies as a villainous equivalent to Dudley, being just as stupid and immature as he is.
* EvilIsHammy: He constantly speaks really loudly. In one episode, he even begins to wonder if his voice has become irritating.
* EvilIsPetty: In addition to doing things that qualify as evil, most of Snaptrap's actions seem to PokeThePoodle.
* FalselyReformedVillain: His plan in "Mall Rat" involves pretending to reform.
* FreudianExcuse: Might qualify considering all the hints dropped on the show about his [[AbusiveParents mother being abusive]], and how much he hates her.
* IronicAllergy: 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.
* JerkassToOne: 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.
* LaughablyEvil: Some of his schemes are so pathetic it's funny.
* NeverMyFault: He is prone to blame anyone for his dumber ideas except for himself, particularly in "Guard Dog".
* NoCelebritiesWereHarmed: Snaptrap's voice is an impersonation of Creator/EdWynn.
* PointyHairedBoss: 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.
* PsychopathicManchild: 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).
* RodentsOfUnusualSize: He's a rat as tall as Agents Puppy and Katswell.
* SpeechImpediment: Has a lisp.
* TokenEvilTeammate: During his brief tenure as a T.U.F.F. Agent in "Snap Dad".
* TooDumbToLive: 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 DidntThinkThisThrough.
* VocalEvolution: 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.
* YouDirtyRat: He's a giant rat who serves as the leader of D.O.O.M..
* ZanyScheme: A RunningGag 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.
[[/folder]]

[[folder:Larry]]
->Voiced by: Creator/JeffBennett
A shrew who is Snaptrap's brother-in-law and one of Snaptrap's henchmen.
----
* AmbiguouslyJewish: He shows a lot of Jewish stereotypes. He has a big nose, balding hair, looks [[JewishAndNerdy nerdy]], [[ShiksaGoddess is married to a Christian]] (Snaptrap's sister), and is always arguing or complaining with Snaptrap.
* BigThinShortTrio: He's the Short to Francisco's Big and Ollie's Thin.
* ButtMonkey: Snaptrap always likes to harm Larry whenever he gets mad. See TheChewToy down below.
* TheChewToy: He suffers a series of AmusingInjuries in almost every episode, especially being launched into Snaptrap's SharkPool.
* EvenBadMenLoveTheirMamas: 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.
* HalfDressedCartoonAnimal: He wears a shirt but no pants.
* HypercompetentSidekick: 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.
* MistreatmentInducedBetrayal: 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, [[ArsonMurderAndJaywalking and renaming himself "Murray"]].
* ObnoxiousInLaws: He is Snaptrap's brother-in-law, frequently bickers with Snaptrap and is often on the receiving end of abuse from Snaptrap.
[[/folder]]

[[folder:Ollie]]
->Voiced by: Creator/JeffBennett
A British opossum who is one of Snaptrap's henchmen.
----
* AffablyEvil: Despite being a member of D.O.O.M., he is one of the most polite characters on the show.
* BigThinShortTrio: He's the Thin to Francisco's Big and Larry's Short.
* CloudCuckoolandersMinder: He generally persuades his boss Snaptrap to carry out evil schemes that are actually useful rather than pointlessly selfish and/or non-threatening.
* EvilBrit: 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.
* InformedSpecies: Despite being a British opossum, Ollie looks more like a weasel or a brown rat.
[[/folder]]

[[folder:Francisco]]
->Voiced by: Creator/DaranNorris
An alligator who is one of Snaptrap's henchmen.
----
* BigThinShortTrio: He's the Big to Ollie's Thin and Larry's Short.
* GreenGators: He's an alligator with green scales.
* HalfDressedCartoonAnimal: He wears a shirt but no pants.
* NeverSmileAtACrocodile: He's an alligator and a D.O.O.M. agent.
[[/folder]]

[[folder:The Chameleon]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_chameleon.jpg]]
->'''Voiced by''': Creator/DaranNorris
----
* AccidentalMisnaming: His debut episode has everyone, ''including himself'' keep mispronouncing his name. ("It is I, the Camolee-on!")
* AttentionDeficitOohShiny: Has a hard time focusing on his schemes over his stomach. Especially when ladybugs are involved.
* AxCrazy: He's a little bit...off. Especially given that some of his schemes involve [[MadBomber gleefully blowing things/people up]].
* CharacterCatchphrase: "It is I, The Chameleon!"
* EvenEvilHasStandards: 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.
* FreudianExcuse: He's a villain due to being a social outcast.
* TheFriendNobodyLikes: 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.
* HollywoodChameleons: More of VoluntaryShapeshifting than blending into backgrounds, he can use his suit to change into other people.
* LorreLookalike: His accent and giant, bulging eyes are clearly based on Creator/PeterLorre.
* NotEvenBotheringWithTheAccent: Despite having the ability to transform into anyone, he (usually) still uses his normal voice, occasionally spouting out random phrases related to his disguise.
* OverlyLongTongue : 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 RuleOfFunny.
* PlayingBothSides: 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.
* RunningGag: Because of his bulbous eyes, he's unable to use eyewear properly.
* ReptilesAreAbhorrent: He's a villainous reptile.
* ShapeshiftingSound: His suit makes a zapping sound when he uses it to transform.
* VoluntaryShapeshifting: His transformation suit lets him take on any form he wants.
* WouldHitAGirl: His first appearance his him trying to get {{revenge}} on Kitty, even successfully taking most of her nine lives.
[[/folder]]

[[folder:Bird Brain]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_bird_brain.jpg]]
->'''Voiced by''': Creator/RobPaulsen
----
* AnimalGenderBender: He has laid eggs for comedic effect.
* BaldOfEvil: 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".
* EvilCounterpart: 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.
* FurryBaldness: He has a balding appearance in spite of his hairless scalp being blue like the rest of his feathered body.
* HairTodayGoneTomorrow: It is sometimes brought up that he used to have a full head of hair.
* HighClassGlass: He wears a monocle to highlight his sophisticated nature.
* IronicName: 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.
* LastOfHisKind: 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, [[ArtisticLicenseLaw despite the fact that in real life, he'd still be protected for being an endangered species]].
* MadScientist: 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.
* MinionWithAnFInEvil: His henchmen Owl and Bat, that usually respond with "Who?" and "Where?", which usually results in WhosOnFirst moments.
* MyBrainIsBig: He's an intellectual villain with a huge, round cranium.
* OnlySaneMan: When you compare him to Snaptrap and The Chameleon, he's a fairly competent villain.
* RailEnthusiast: He really likes taking the bus and he even memorized different bus schedules. Only because he can't fly.
* RememberTheNewGuy: Dudley and Kitty have already been acquainted with him by the time he's encountered in "Mom-A-Geddon", his first appearance.
* SurroundedByIdiots: 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.
* YoungerThanTheyLook: According to "A Doomed Christmas" he's 23, though that doesn't stop everyone else from thinking otherwise.
[[/folder]]

[[folder:Jack Rabbit]]
->'''Voiced by''': Creator/DaranNorris
----
* BarefootCartoonAnimal: He's a cartoon rabbit who goes barefoot.
* FallenHero: He was a former T.U.F.F. agent, but he now makes a living stealing secret information.
* FauxAffablyEvil: He gets his way by using his "charms" to get people on his side and then take advantage of them.
* TheNameIsBondJamesBond: As with any James Bond parody, he introduces himself by saying his last name and then his full name.
* PunnyName: His name is Jack Rabbit, he's a rabbit, and there is an actual animal called jackrabbit.
* SpeciesSurname: A rabbit with the last name Rabbit.
* TuxedoAndMartini: He's a very blatant James Bond pastiche, to the point that he gets a BondGunBarrel sequence, introduces himself by [[TheNameIsBondJamesBond saying his surname and then his full name]] and has a voice that's a clear impersonation of Creator/SeanConnery.
[[/folder]]

[[folder:Quacky the Duck]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_quacky_duck.png]]
->'''Voiced by''': Maddie Taylor
----
* DepravedKidsShowHost: He turned to villainy after his show got canceled, and thus commits crimes while still acting out his kid-friendly persona.
* ExcitedKidsShowHost: He even continues to act like this after he gets arrested, though he's considerably calmer.
* EarlyBirdCameo: Is mentioned and shows up on television a few times before he becomes a supervillain.
* FaceHeelTurn: He turns evil after his show gets cancelled by the network president.
* FalselyReformedVillain: Most of his latter plans include pretending to go straight and open some kind of business.
* FlawExploitation: Is entirely aware that Dudley's an idiot, and often uses it to his advantage.
* NoCelebritiesWereHarmed: Quacky's voice is an impersonation of Creator/BobcatGoldthwait.
* PaperThinDisguise: 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.
* SeriousBusiness: His ShowWithinAShow is insanely popular. Even after he gets arrested, he's so famous he's able to become a VillainWithGoodPublicity with almost no effort.
* SuspiciouslySpecificDenial: 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.
* VillainHasAPoint: 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.
[[/folder]]

[[folder:The Sharing Moose]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_sharing_moose.jpg]]
->'''Voiced by''': Creator/JeffBennett
----
* TheBrute: He does the heavy lifting for Quacky.
* TheDragon: He is Quacky's main helper and muscle.
* HalfDressedCartoonAnimal: He doesn't wear anything besides a shirt.
* OddNameOut: Among Quacky's co-hosts, the Sharing Moose is the only one whose name is not even phonetically alliterative.
[[/folder]]

[[folder:F.L.O.P.P.]]
->'''Voiced by''': Creator/DaranNorris (Meerkat), Creator/JerryTrainor (Wanna-Bee), Maddie Taylor (Escape Goat)
----
* CharacterCatchphrase: Wanna-Bee has a tendency to describe things as "super bad".
* ChuckCunninghamSyndrome: Fidder Crab is not seen after "Top Dog"
* EvenEvilHasStandards: They thought pushing all the buttons in a crowded elevator was too far.
* GoldfishPoopGang: 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.
* NoCelebritiesWereHarmed: Meerkat's voice is a Creator/PaulLynde impression. Escape Goat's voice an impression of [[Creator/PaulReubens Paul Reubens']] character Pee-wee Herman.
* NotSoHarmlessVillain: 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).
[[/folder]]

[[folder:The Caped Cod]]
->'''Voiced by''': Creator/ChrisParnell ("The Dog Who Cried Fish"), Creator/MickWingert ("Cold Fish" onward)
----
* AuthorityInNameOnly: 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.
* NoCartoonFish: His biggest problem is that he doesn't realize he is the only exception in a show that otherwise plays this straight.
* TooDumbToLive: He continues to have the Seal of Approval as his henchman in spite of his lackey repeatedly trying to eat him.
[[/folder]]

[[folder:Katty Katswell]]
->'''Voiced by''': Creator/GreyDeLisle
----
* EvenBadMenLoveTheirMamas: One reason her mother views her more favorably than Kitty is that she used her [[OnePhoneCall one phone call]] to call her mother on her birthday.
* EvilTwin: She is Kitty's twin sister and a criminal.
* IdenticalTwinIDTag: She looks just like her sister Kitty, except with a white streak in her hair and wearing [[InstitutionalApparel a striped convict uniform]] instead of a SpyCatsuit.
* InstitutionalApparel: Aside from disguising herself as her sister by taking her clothes, the only clothing Katty is shown wearing is a striped convict uniform.
* MonsterOfTheWeek: The only time she appears physically is in "A Tale of Two Kitties", where she is the antagonist.
* OnePhoneCall: 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.
* TwinSwitch: 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.
* UnseenNoMore: Physically appears in "A Tale of Two Kitties" when previously she was only mentioned in "Diary of a Mad Cat" and "Bluff Puppy".
[[/folder]]

!!Other
[[folder:Peg Puppy]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_peg_puppy17.png]]
->'''Voiced by''': Leslie Carrara-Rudolph
----
* AlliterativeName: Her name and surname both start with the letter "P".
%%* JewishMother
* MiniatureSeniorCitizens: Her son is an adult and she is way smaller than he is.
* MyBelovedSmother: Dudley is frequently annoyed by his mother's nagging.
* ParentWithNewParamour: 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.
* SpeciesSurname: She's a dog and Dudley's mom so of course her last name is Puppy.
[[/folder]]

[[folder:Tammy]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tuff_puppy_tammy.png]]
->'''Voiced by''': Creator/GreyDeLisle
----
* HartmanHips: She has wide hips.
* HyperCompetentSidekick: 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'.
%%* InnocentBlueEyes
* OnlySaneWoman: Along with Kitty, she's one of the few consistently competent employees of T.U.F.F.
* RighteousRabbit: A rabbit working for T.U.F.F.
%%* SassySecretary
* ShipTease: With Keswick.
* SouthernBelle: She's an attractive woman with a Southern accent.
[[/folder]]

[[folder: Eric]]
Kitty's secret crush.
* HiddenDepths: 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.
* MrFanservice: Sort of. He doesn't get many ShirtlessScene but he is a very handsome guy.
* NiceGuy: He appears to be quite pleasant and polite as well as understanding.
* SatelliteLoveInterest: He mainly exists for Kitty's affections.
[[/folder]]
[[folder: Mrs. Katswell]]
Kitty's mother.
* AbusiveParent: In "Diary of a Mad Cat" we see that she makes Kitty feel inferior especially when she is compared to her criminal twin sister.
* ParentalIssues: Kitty seems to have some serious mommy issues and as shown in "Diary of a Mad Cat", it's not hard to see why.
[[/folder]]
[[folder: 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.
* DumbBlond: 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.
* KindheartedSimpleton: She gets her words mixed up very easily and is very sweet, bubbly, and friendly
* NiceGirl: It's pretty easy to see why Dudley likes her so much.
[[/folder]]
----