Note: Several characters' allegiances shift between incarnations. They have been placed in the side they are most usually associated with.Characters exclusive to the following series can be found here: Comic BooksThe Mirage booksCartoonsTeenage Mutant Ninja Turtles (1987)Teenage Mutant Ninja Turtles (2003)Teenage Mutant Ninja Turtles (2012)FilmsThe Live Action TrilogyTMNTTeenage Mutant Ninja Turtles (2014)Live Action TVNinja Turtles: The Next Mutation
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As a whole
- Airplane Arms: The turtles consistently run like this.
- Badass Family: The turtles and Splinter, undeniably so.
- Bald of Awesome: By virtue of being hairless reptiles.
- Divergent Character Evolution: The Turtles were more or less identical in the original comics, the 1987 series gave them different colored bandanas, the toys based on that series gave them different skin tones, the movies gave them different body types that have continually been exaggerated into the 2007 movie, the Back to the Sewer redesigns in the 03 series, and the 2012 series.
- Four-Temperament Ensemble: The rational leader Leonardo is Melancholic, the calm gadgeteer Donatello is Phlegmatic, the goofball Michelangelo is Sanguine, and the short-tempered Raphael is Choleric.
- Green Eyes: In the 2003 cartoon.
- Happily Adopted: Splinter isn't their true father (obviously), but they love and respect him like he is.
- Hilariously Abusive Childhood: Let's just say Splinter's lessons aren't exactly gentle.
- Metamorphosis: From turtles to humanoid turtles.
- Named After Somebody Famous: After iconic Renaissance artists.
- Signature Team Transport: The Turtle Van, which has been remimagined into the Battle Shell, The Shellraiser, and Cowabunga Carl's van. As of the Live Action Next Mutation series, Raph usually gets a motorcycle too.
- True Companions: Badass Family plus friends.
Leads. Always in control. Does anything to get his ninjas through. Identifiable by his blue bandana and his twin swords.
Appears in: All incarnations.
- All-Loving Hero: Even after all the betrayals and all the terrible things he's seen, Leo still expects the best out of people.
- Authority Equals Asskicking: Consistently the most skilled Turtle, he falls into the leadership role by default.
- The Chains of Commanding: Michaelangelo actually notes this in an episode of the 4Kids series: Leo takes the burden of being the leader so his brothers can do what they want: Dontaello's free to pursue his technological inventions, Raphael's free to let loose and fight, and Mikey's free to just relax because their brother's in control.
- Berserk Button: More often than not, Raphael is this. Especially when the latter disobeys him or mocks him for being a Teacher's Pet.
- Big Brother Instinct: Even though he's never officially stated to be the oldest.
- Bookworm: He seems to be this in the 1987 incarnation. In the "Leonardo is Missing" episode, he stays at the lair and reads while the other turtles go to an arcade.
- Child Soldiers: Of the four, it's Leonardo who exemplifies this the most.
- Combat Pragmatist: Leonardo's sense of honor dictates that he fight fairly, but when he's pushed into a corner or there is no other alternative, he will not hesitate to slice off your head.
- Cultured Warrior: Depends on the writer, but if one of the turtles is going to be in touch with Japanese traditions, it's gonna be Leo.
- Depending on the Writer: A lot of tropes carry over between series, but some are fairly unique. Leonardo is always the skilled, "most leader-like", and responsible turtle. But whether its accomplished by being an overly serious workaholic, a respectable older brother figure, bossy teacher's pet, meditative and spiritual, wanting to emulate fictional archetypical heroes or any combination of the above depends on the series and sometimes the story arc. Overall he is one of the most consistent across all interpretations.
- One very good (actually very bad) example is the 2007 movie written by Kevin Munroe, who clearly had a favorite turtle. Not only are Leonardo's traits exaggerated and warped to provide an antagonist/foil for Raphael, but his personality and background are sacrificed for the movie's plot.
- Dual Wielding: He always wields two swords, and if one is broken he still fights with the other one.
- Emotions vs. Stoicism: A lot of what he puts up with has him wondering if he should fight or remain still.
- Guilt Complex: He is very bad with this. Very bad.
- Heroes Prefer Swords: As the leader of the group, Leo gets the shiny swords.
- Heroic B.S.O.D.: Mirage Comics, 4Kids Series.
- Heroic Spirit: A big reason why he's a determinator.
- Heterosexual Life-Partners: With Miyamoto Usagi.
- Indy Ploy: Alarmingly, a lot of his plans qualify as this. Most of the time, however, they actually work.
- Innocent Blue Eyes: In the 2012 Nick series, obviously. They help solidify his youth and inexperience.
- Katanas Are Just Better: Obviously.
- Although Leonardo's swords are often much more closely modeled around the ninjato.
- Knight Templar: Leonardo's story arc in the 4th season of the 4Kids series have him nearly cross over into Knight Templar territory. His rage gets so bad he actually wounds Splinter and has to be sent away to Japan to learn from Splinter's master.
- The Leader: He's usually the leader of the four turtles across their incarnations.
- Martial Pacifist: Mirage Leonardo, in the future.
- Master Swordsman: His weapons of choice are twin katana, and he's very good with them.
- The McCoy: Though he overlaps with The Kirk. Along with Mikey, he's usually presented as the most empathic of the turtles, whether it's granting mercy to an overmatched foe, or saving the life of a mutant two seconds after she tries to kill him.
- Named After Somebody Famous: Leonardo da Vinci.
- Nerves of Steel: Captured by aliens, trapped thousands of miles from Earth with no way back, poisoned and weaponless? For Leonardo, that's a training run.
- No-Holds-Barred Beatdown: He gets into quite a few of these. If he's not on the receiving end, he's usually administering it.
- Old Master: Mirage Leonardo, in the future.
- A Protagonist Shall Lead Them: Leonardo usually gets the most lines of dialogue, and most of the stories are told from his perspective. Even when he's not presented as the main character (such as the TMNT movie), he plays a major role.
- Samurai: Leonardo is technically a ninja, but a lot of the tenets he quotes are in line with samurai. It's no surprise he and Usagi got along swimmingly.
- Scars Are Forever: To an extent. In the Season 3 finale of the 4Kids series, Karai—whether accidentally or not—stabs Leo. Her sword goes through his shoulder and out the side of his upper shell. All throughout Season 4 the crack in his shell remains as he descends into Knight Templar territory, and even after he recovers it refuses to heal. Not until the Fast Forward reboot, anyway.
- Sliding Scale of Idealism vs. Cynicism: In the 4Kids series, he starts out at the very end of the Idealism scale, even believing the best of the Shredder and then his daughter Karai. As the seasons progress he shows signs of being capable of sliding down the other way—he does this in the fourth season—though he remains mostly rooted in idealism.
- The Spartan Way: All the turtles train hard, but Leonardo—whether or not by his own design—is almost always subjected to the kind that involves complete isolation, distant countries, and/or imminent death.
- In the 4Kids series, Leonardo as a child was suffering from a fear of heights. Splinter brings him to the top of a gigantic reservoir and pretends to be in danger of falling. Leonardo forces himself to crawl out and save him, and apparently conquers his fear in the process.
- Standardized Leader: Usually in his most basic, stripped-down incarnations.
- Thou Shalt Not Kill: Mirage Leonardo, in the future.
- Took a Level in Badass: In all incarnations, the turtles all go through this, but Leonardo is the one who most clearly demonstrates the trope. One example is in the first season of the 4Kids cartoon where he can barely handle fighting one of the Foot Elite, and is nearly killed trying to take on all four. By the end of the fourth season, he not only takes on all four without apparent difficulty, but also bests Karai, the incumbent Shredder, in the process.
- Took a Level in Jerkass: During the first half of the 4Kids cartoon's fourth season, combined with Heroic B.S.O.D.. He had a really good reason.
- Weapon of Choice: Twin Katana.
- "Well Done, Son!" Guy: Most of what Leonardo does is to please Splinter. Whether or not this is a good thing is still a debate in fandom.
- What the Hell, Hero?: Leo gets this in the 4Kids cartoon from his brothers and Splinter when he's on the verge of becoming a Knight Templar.
- Wise Beyond Their Years: In childhood flashbacks, he's usually the turtle acting like the adult. And for a teenager, he deals very well with duties and responsibilities most adults would be unable to fathom.
Does machines. Is the brains of the bunch. Marked with a purple headband, and fights with a bo staff.
Appears in: All incarnations.
- Badass Bookworm: He's an Omnidisciplinary Scientist par excellence as well as a skilled warrior.
- Badass in Distress: The time he was captured by the Triceratons, and the end of the Outbreak arc after being mutated a second time. Less dramatic instances are scattered throughout the 4Kids series, too, usually when it would be easy for him to solve a problem/end an episode before its time.
- Bond Breaker: Donatello was warped into an alternate future where he had disappeared for 20 years. Without his resourceful, tech savvyness, the Turtles were disbanded and the Shredder had succeeded in world domination. The supporting cast made up the last rebel resistance.
- Big Little Brother: Taller than Leo but, fittingly, tied with Raph. It's taken to the next level in the 2012 cartoon, where he's noticeably the tallest of all his brothers.
- Brainwashed and Crazy: Not quite brainwashed, but mutated and certainly crazy enough to live up to the spirit of the trope during the Good Genes arc— unwitting Face–Heel Turn included. He also gets possessed by a mutant car in the 2012 cartoon, and boy does it make him crazy.
- Brown Eyes: In the 2012 cartoon, presumably to show his "plainness".
- Butt Monkey: Has become this in the 2012 cartoon.
- Crazy-Prepared: "I don't know what bothers me more - that this actually works, or that Don carries around a pigeon puppet?"
- Depending on the Writer: A lot of tropes carry over between series, but some are fairly unique. Don is always The Smart Guy. But he's sometimes contemplative and detached, laidback and sarcastic, nerdy and clumsy, a bit tense and highstrung, or love struck with April or some combination of the above depending on the series and sometimes the story arc.
- Doesn't Like Guns: Mirage comics.
- Fighting from the Inside: A variant while he was prisoner on board the Triceraton mother ship, resisting against borderline Mind Rape. He held out for awhile, but needed help to fend the assault off.
- First-Person Smartass: Whenever he's the one voicing the opening narration in the 2003 series.
- Gadgeteer Genius: Considering that he's self-taught, living in a sewer, and working mostly with scavenged junk, Don's inventing abilities are downright super-reptilian.
- Genius Bruiser
- Gentleman Snarker: In the 4Kids show, he's second only to Splinter where polite snarking is concerned.
- He's more like a Deadpan Snarker in the 2012 series, particularly when he's firing back at Raphael for his "meathead" declarations.
- Heroic B.S.O.D.: Like Leonardo, he suffers one in the 4Kids series' last season up until the end of episode 5. Cody finally manages to fix his Time Window to send the turtles and Splinter back to the present, but due to some inteference from Viral, Splinter is vaporized and it's later revealed that he's trapped in cyberspace.
- Intelligence Equals Isolation: Not often, but on occasion he's sequestered off in his lab. Most noticeable in 'Return to the Underground'.
- The Klutz: A trait that doesn't come up often— but if/when it does, it's always in the middle of a fight or stealth mission.
- The Lancer: He's the team's second-in-command.
- Layman's Terms: Often the one doing the translating, sometimes visibly annoyed.
- Martial Pacifist: According to his official profile, he'd like to be one.
- Metamorphosis: Twice— once in the backstory, once at the end of the 2003 toon's fourth season.
- Mighty Glacier: In most games. Slow as a... Well, turtle, but tends to have top-tier attack power and the longest reach.
- Named After Somebody Famous: Donato "Donatello" di Niccoló di Betto Bardi.
- Number Two: In the original comic series and '87 cartoon. He was expected by both Splinter and Leo to take on this role in the fourth movie, but couldn't keep Raphael in line. By the end after Raph got his head on straight, he took over leadership from Don.
- Omnidisciplinary Scientist: He's a genius mechanic, but usually also has knowledge of biology.
- O.O.C. Is Serious Business: Played backwards, actually. We get the 'serious business' part within the first few minutes of Same as it Never Was. Just before the episode's Bittersweet Ending, the OoC part comes in.
- Out-of-Character Moment: Don absolutely slaughters Ch'rell at the end of SaiNW, a far cry from his usually pacifistic actions. Understandable, of course given the circumstances.
- Precocious Crush: In the 4Kids cartoon, he has one on April. With April's de-aging in the Nick cartoon, it becomes a plain old crush and much more blatant.
- Sesquipedalian Loquaciousness: For example: "The elasticity of its flesh is too resilient!" note
- The Smart Guy: He's the smartest member of the turtles.
- Technical Pacifist: In some incarnations.
- Teen Genius: He's always a genius, even in his younger incarnations.
- Took a Level in Jerkass: He was always cool-headed, but in the 2012 series, he has become more neurotic and prone to outbursts. It does work at times though. He also becomes selfish when it comes to April.
- Weapon of Choice: A Simple Staff.
- Weirdness Magnet: Even amongst his brothers.
- Wrong Genre Savvy: Demonstrated a couple of times throughout 2k3— like trying something he saw in a movie during a fight with the Foot. It doesn't work.
Is cool but rude. Throws the first punch. The muscle with the most attitude. He wears red and fights with a pair of sais.
Appears in: All incarnations.
- Accidental Misnaming: A lot of fans mistakenly call him "Ralph" instead of Raph.
- Acrofatic: Not necessarily fat but 2012 Raphael is noticeably more thickset (it's mostly muscle though) than his brothers but is frequently shown as the first one to throw himself into backflips and cartwheels.
- Aloof Big Brother: Partially inverted. He's younger than Leonardo making him an aloof little brother, but older than Donatello and Michelangelo, playing it straight for them.
- Ax-Crazy: To some degree in the Mirage comics where he's by far the most violent of the turtles.
- Badbutt: In the Fred Wolf cartoon.
- Bash Brothers: With Casey.
- The Berserker: Mostly. (Every continuity but the Fred Wolf cartoon.)
- Big Brother Bully: To Michelangelo, in the cartoons. Also, to a lesser extent, to Donatello (especially in the 2012 series) and even Leonardo.
- Big Brother Instinct: Again, towards Michelangelo, especially in the comics.
- Blood Knight: Can slip into this at times.
- Breaking the Fourth Wall: In the 1987 cartoon, each of the turtles would break the fourth wall at some point, but Raphael did it most frequently. This is lampshaded in Turtles Forever, much to the confusion of the 2003 cartoon cast.
- Brooklyn Rage: Not only because he's an angry New Yorker - the first movie even gives him a Brooklyn accent.
- Catch Phrase: In the 03 series. "I got your X right here." and also "You and me are having words."
- Deadpan Snarker: Fred Wolf cartoon. Also in most other continuities, albeit dialed down.
- Depending on the Writer: A lot of tropes carry over between series, but some are fairly unique. Raphael is always the most cynical turtle. But he can range anywhere from being violent and sadistic, a sarcastic wisecracker and complainer, a meathead jock, brooding loner, or some combination of the above depends on the series and sometimes the story arc.
- Expy: Of Wolverine in the Mirage comics.
- Eyepatch of Power: All of his future incarnations.
- Fire-Forged Friends: With Casey, in most incarnations.
- Glass Cannon: Fastest move rate and attack speed in most games he is featured in, but he has to kiss enemies to hit them with his sai, and has the lowest health. The lack of strength is completely inverted in the comics.
- Green Eyes: The only one to retain them from the 2003 cartoon to the 2012 one, as the color is associated with Hot-Blooded people.
- Hair-Trigger Temper: Every turtle incarnation is bound to have an episode focusing on this aspect of him alone.
- Jerkass Façade: Oh, he cares. He just doesn't want anyone else to know he cares.
- Legacy Character: It's not well known but he's actually the second Nightwatcher. He took up the job after the previous one, David Merryweather, died - As shown in the prequal comic to the '07 movie
- Lightning Bruiser: Is often noted as being the turtle with the strongest physical strength, but in the very first issue of the very first comic, he was noted as being the best at stealth, sent alone to deliver a message to the Shredder.
- Manly Tears: Shows this in the "Tales of Leo" episode. The first film had him weeping over how he couldn't control his temper, and that Splinter might be dead because of him.
- Middle Child Syndrome: Played with. Raphael isn't the middle turtle, but he feels as if no one understands him. Lampshaded at least once a season in any franchise. Really taken home in the fourth movie when he takes on the alias of The Nightwatcher.
- Mighty Glacier: Contrary to Lightning Bruiser above, Raph will supposedly have slow but powerful attacks in the upcoming "Mutants in Manhattan" video game. The introduction to the 2012 cartoon also has the other brothers doing faster and flashier moves while showing off their weapon skills, whereas Raph just kind of brutally stomps around.
- Number Two: In the 4Kids and Nickelodeon series but not in others. Still doesn't stop him from wanting to be the leader and taking charge over Donatello in the other series sometimes. For example at the end of the fourth movie where Splinter outright states that Raphael has the makings of a great leader and Raph leads the rest to rescue Leo.
- Named After Somebody Famous: Raphael Sanzio da Urbino.
- No-Holds-Barred Beatdown: Gets this in the first movie.
- Red Is Heroic: He's always a hero but typically in on-going series he plays the lancer to Leo while in one-off stories he is the main protagonist who has to overcome this anger.
- Secret Identity: Nightwatcher, in the fourth movie.
- Throwing Your Sword Always Works: Raph throws his sai a lot.
- Took a Level in Jerkass: If you're more familiar with the Fred Wolf cartoon.
- In the 2012 series as well, no matter which incarnation you compare him to. However, he slowly gets better in later episodes.
- Weapon of Choice: Sai Guy.
- Why Did It Have to Be Snakes?: In the Nickelodeon series, he's terrified of cockroaches.
Is a party dude. The wiseguy. The wild one and one-of-a-kind. The most laid-back of the turtles, who lists among his interests pizza, comic books, and more pizza. Wears an orange-yellow bandana, and duels with nunchaku.
Appears in: All incarnations.
- Annoying Younger Sibling: Except in the '87 series where he's second eldest to Leonardo. Leonardo listed as 16, Mike 15 1/2, and Raph and Don both 15.
- Ascended Fanboy: Sorta, he's a big comic book geek who happens to be a superhero himself.
- In the Mirage comics he's a comic book geek who gets to write for comic books and even becomes a published novelist.
- Attention Whore: 4Kids series.
- Badass Adorable: Silly, loves him some comic books, childish, always willing to crack a joke and and can kick tons of asses with his nunchucks. Yup. Taken to it's furthest extreme in 2007's TMNT where Mikey is the shortest turtle and has huge adorable Innocent Blue Eyes (we know it doesn't make sense, but it's cute, dammit).
- Big Eater: In the Fred Wolf cartoon, he'd often annoy his brothers by eating all the pizza.
- Brilliant, but Lazy: He's usually portrayed as having great potential, but because of his more laidback personality, he'll focus on something more fun instead.
- This is enforced with his Weapon of Choice (the chucks, see below), the laziest of the turtles is the one wielding the most complex and difficult weapon. That's not something one can do without a gift for it.
- Bruce Lee Clone: Strange as it may seem, he started out as this: Kevin Eastman thought, "If Bruce Lee were an anthropormorphic animal, what's the most ridiculous animal he could be?", concluded that it was a turtle, and drew a picture of a turtle in a Bruce Lee pose, wielding a nunchaku. He and Peter Laird then began drawing pictures of turtles wielding other martial arts weapons, and the rest is history.
- Butt Monkey: Especially in the cartoons. If any of the Turtles klutzes out or has something bad happen to them for comic effect, it's Michelangelo.
- Catch Phrase: The most famous "Cowabunga!" as well as "Booyakasha!" in the Nickelodeon cartoon series.
- Characterization Marches On: Depending on the version, really - in the comic books, he isn't really a party dude, but more of a down-to-Earth type of guy as opposed to his brothers. He was able to author a book at one point.
- In the Mirage comics he often traded back and forth with Donatello as The Smart Guy with Donny being the expert in science and technology while Mikey's specialty was culture and literature.
- Ironically when compared to his later incarnations, Mikey is also one of the most violent of the group in the Mirage comics. Only Raph (who can border on Ax-Crazy) is worse.
- Cloudcuckoolander: Generally the most whimsical of the turtles but especially in the Nikelodeon series, where he wanted a tattoo of his face on his own face.
- Crouching Moron, Hidden Badass: (4Kids series): Although he can always kick ass, his skills will occasionally take a bump as the plot requires, allowing him to take on foes that would normally defeat him or his brothers.
- When Usagi Yojimbo leaps into the Turtles' Lair thanks to a dimensional portal Don accidentally opens with a viewer he was building, Usagi is able to defeat Don, Raph and Leo (who are using their bo, sai and katana). Mikey slings a pizza at Usagi's face to stop Usagi. When Usagi is curious at how Mikey beat him, and asks the name of the art used, Splinter goes, "I believe it is called...slapstick."
- Depending on the Writer: A lot of tropes carry over between series, but some are fairly unique. Mike is always the 'fun guy' and comic relief. But he ranges from being down to earth and artistic, to a laidback surfer dude, to an egocentric prankster, to a hyperactive ditz. What counts as the hip and cool Kid-Appeal Character changes the most between series over the 25+ year history of the franchise. He's usually a reflection of the times.
- Dope Slap: Gets it a lot in the 4Kids and Nickelodeon series.
- Fun Personified: Not really in the Mirage comic (he had his more lighthearted moments but was mosly just the Generic Guy of the four Turtles), but in pretty much every other incarnation he's this.
- Generic Guy: In the Mirage comic he had a tendency to become this, due to being the least-featured and least-developed of the Turtles. It was the Fred Wolf cartoon that made him the Fun Personified Plucky Comic Relief Kid-Appeal Character he became known as.
- Hard Work Hardly Works: Although the trope is disproved by Leonardo, there is an element of this to Mikey's abilities, and he is consistently considered to be the most naturally gifted of the turtles despite his lack of focus and dedication to training.
- The Heart: Although he exasperates his three brothers on a constant level, when a serious rift between their bond takes place, he usually is the one to try and patch things up...usually via humor.
- Hooks and Crooks: Occurs in later seasons of the original cartoon, due to censorship in England.
- He also uses one briefly in the 4Kids cartoon as a callback.
- The Nickelodeon cartoon has him using this almost as much as his nunchaku.
- Innocent Blue Eyes: In the 2007 movie, the Back to the Sewers incarnation of the 4Kids series, and the new Nick series. They go a long way toward making him look adorable.
- Jive Turkey: When he's not a Surfer Dude.
- Kindhearted Cat Lover: He has a pet cat in three incarnations.
- Lightning Bruiser: In the various video games (Turtles in Time, The Arcade game, Manhattan Project), Michelangelo runs faster than Leo and Don and has more health than all of his brothers. However, his nunchucks are slow and have little range.
- Named After Somebody Famous: Michelangelo di Lodovico Buonarroti Simoni.
- Nice Guy: It varies a little with the incarnations (in some, most notably the Next Mutation show and the 4Kids cartoon, he borders on Adaptational Jerkass), but he is generally portrayed as the friendliest, most outgoing and most soft-hearted of the Turtles.
- Plucky Comic Relief: Starting with the Fred Wolf cartoon, he got this role and held onto it throughout all other incarnations.
- Real Men Wear Pink: In Back to the Sewers he was positively delighted when April asked him to be her Maid of Honor, when people tried to call him the more gender-neutral "Turtle of Honor" he would correct them.
- In the Mirage comics he was the Team Chef, even cooking an elaborate Christmas dinner in one issue.
- The Red Mage: In the games, average movement speed and faster attack speed than Don, but defensively weaker than Leo.
- Screams Like a Little Girl: 4Kids and 2012 series.
- Secret Identity: Turtle Titan (4Kids cartoon).
- Spell My Name with an "S": Many incarnations misspelled the name as Michaelangelo. (which fit as in some languages it is a variation on Michael Angel)
- In the Fred Wolf cartoon he's briefly turned into a human, and goes, "Look out world, here comes Michael Angelo! Michael J. Angelo, that is!"
- Surfer Dude: Mostly in the Fred Wolf cartoon, although aspects of this remain in other incarnations.
- Took a Level in Dumbass: In the 2012 series. For example, he nearly got himself killed after eating on of Donny's experiments that was clearly labeled "Mikey, don't eat".
- Took a Level in Jerkass: In the Next Mutation series. To a lesser extent, in the 4Kids series as well.
- Trademark Favorite Food: Though pizza is the favorite food of all four turtles, Michelangelo eats it more obsessively than the other three, especially in the Fred Wolf cartoon. He was the first to try it in the 2012 show.
- Weapon of Choice: Fighting with Chucks (the hardest to master of the four turtles' weapons).
- What Happened to the Mouse?: Invoked with the Mirage stories set in the future. While we see what became of the others, Mikey's whereabouts are unaccounted for and his brothers openly wonder what became of him.
Taught them to be ninja teens. A mutated rat who serves as the turtles' mentor and father, raising them from when they were young. Most incarnations choose one of two origins for him: he's either the pet rat of ninja master Hamato Yoshi mutated into a humanoid form, or Hamato Yoshi himself mutated into a ratlike form.
Appears in: All incarnations.
- Badass Grandpa: He's generally getting on in years across his various incarnations, but never ceases to kick lots of ass.
- Butt Monkey: He sometimes finds himself on the receiving end of his sons' antics, especially in the 4kids series.
- Cool Old Guy
- Composite Character: He and Hamato Yoshi are one and the same in several continuities.
- Depending on the Writer: In terms of martial arts skill, Splinter is characterized differently in each different incarnation. In some continuities, he's evenly matched against the Shredder. In others, he's the only one capable of defeating the Shredder in battle. And alternately, in other incarnations, he tends to suffer the Worf Effect and is usually defeated by Shredder in one-on-one battles, highlighting the need for all four Turtles to work together to defeat him.
- Metamorphosis: Human to rat in Fred Wolf/Archie/2012, rat to humanoid everywhere else.
- Not Quite Dead: Possibly in Mirage. Issue #32 of the fourth volume had Donatello learn that the Splinter who died and was cremated wasn't the real one. Due to the volume's lengthy hiatus problems, this has yet to be fully explained, as well as whether or not Donatello is mistaken.
- Not So Above It All: 4Kids, but frequently displays this across all mediums. He loves his soap operas, beats out Casey and Raph in poker several times, snarks periodically about his sons' antics, and even cracks a joke here and there.
A girl next door who serves as one of the turtles' first human friends. Normally associated with the color yellow.
Appears in: Most incarnations.
- All Girls Want Bad Boys: Her attraction to Casey in the comics.
- Bag of Kidnapping: Happens to her in the Fred Wolf cartoon episode "Turtles On The Orient Express".
- Bare Your Midriff: 4Kids cartoon.
- Bound and Gagged: Fred Wolf cartoon. The 2012 series does a nod to this when she's abducted by the Kraang.
- Cursed with Awesome: April is turned into a fish mutant in one episode of the Fred Wolf cartoon. She's understandably upset about it, but it saves her life when the villain's base is flooded and she's able to breathe underwater like the Turtles.
- Damsel in Distress: In Fred Wolf cartoon, April was frequently kidnapped by Shredder, quite often as bait in order to lure the Turtles out of hiding in order to unleash his latest attempt at destruction upon them.
- Turtles Forever exploited this plot device to comic effect when the 2003 Turtles arrived in the "1987" Turtles' dimension, with 1987 Donatello commenting that they saved April at least once a day to the extent that watches could be set by it.
- Fainting: Occurs after she first sees the turtles in every incarnation with the exception of the 2012 series.Michelangelo: She ain't no fun, she fainted.
- Fantastic Voyage: In volume 4 of Mirage comics
- Going for the Big Scoop: Fred Wolf cartoon, Archie Comics.
- Hot Scoop: Fred Wolf Cartoon, Archie comics, first two movies.
- Motherly Scientist: In the IDW Comics, where she becomes quite attached to the pre-mutation turtles and even gives them their names.
- Odd Friendship: In most adaptations Splinter and April strike up a deep but rather strange friendship. April is sometimes perplexed by the various personality quirks of each turtle while Splinter is exasperated having seen this all before.
- The relationship is more paternal though in the 2012 cartoon.
- Race Lift (Mirage comics): Although her race was never established within the comics, or even agreed upon by the creators, Kevin Eastman used to draw her with distinctively non-caucasian features (He was, coincidentally, dating a mixed-race woman at the time), which went away when he stopped drawing and she became clearly white.
- In the 2012 cartoon, it's revealed that her mother was experimented on and she's half human with some Kraang features
- Took a Level in Badass: In most continuities she eventually starts training with the Turtles and Splinter if only for self defense as she continues to be part of their support group. The 2012 series deserves special mention for doing this essentially right off the bat, seven episodes in.
- Unfazed Everyman: After her intial scream and/or faint upon meeting the turtles she becomes this.
- Younger and Hipper: The 2012 series makes her a young teen, as old as the turtles themselves.
An eccentric vigilante who fights crime with various sporting tools (baseball bats, hockey sticks, etc.) Tends to have the most in common with Raphael.
Appears in: Most incarnations.
- Affectionate Parody: Of Ninties Anti-Heroes according to Word of God.
- Ax-Crazy: In the Fred Wolf cartoon (well, as Ax Crazy as any hero in it was allowed to be).
- Badass Normal: The only member of the team who has never had any mutant powers or abnormal origins in any continuity.
- Bash Brothers: With Raph.
- Big Brother Mentor: He becomes this to Raph in the 4th movie with both of them using the other as a sounding bard for their respective issues.
- Big Damn Heroes: Gets to do this occasionally, like in the first live-action movie.
- Catchphrase: "GOONGALA!!!"
- In the 4Kids cartoon, it's revealed that the young turtles were teaching him all about martial arts and fighting (although they never found out) and each took turns to teach him what they knew. The cry comes from when Mikey was training him and told him to say "Gorogoro-sama!" (translation: Lord Thunder). But since Casey couldn't pronounce it correctly, he made his famous phrase.
- Combat Pragmatist: Even the bad guys admit that Casey just plain fights dirty.
- Dark and Troubled Past: For the 4Kids cartoon, although aspects of it were later adapted to the original comic book incarnation.
- Demoted to Extra: Fred Wolf cartoon, the 3rd movie.
- Drop the Hammer: In the comics Casey carried, as a weapon of last resort, a sledgehammer (along with regular croquet mallets).
- Embarrassing First Name: Arnold. Casey is his middle name, nickname, or derived from his middle initials (K.C.) depending on the incarnation.
- Expy: Vocally, of Clint Eastwood (specifically Dirty Harry) in the Fred Wolf cartoon.
- Fire-Forged Friends: His friendship with Raphael consistently begins this way, and leads him to befriending the other turtles.
- He Who Must Not Be Seen: Aside from being mentioned in the last issue of the Year of the Turtle miniseries, Casey Jones never appeared in the Archie Comics series.
- Improbable Weapon User: Hockey sticks, baseball bats, golf clubs, croquet mallets, cricket bats...
- The last being really amazing because you gotta know what a crumpet is to understand cricket!
- Casey, at one point, weaponizes a freakin' garbage truck! The movies drop subtle hints that while a poor fighter with his own hands with a weapon he's pretty much unbeatable.
- I Know Madden Kombat: Casey uses sports equipment as his main weapon.
- Jerk with a Heart of Gold: All versions have him being a jerk to at least one of the heroes, but they all still have a heart.
- Mask Power: When going into action, Casey usually wears an old-style hockey mask.
- Out of Focus: Nick cartoon. He finally appeared in season 2.
- Pre-Mortem One-Liner: In the first live-action movie, he sheepishly says "Oops!" before activating the trash compactor to crush Shredder. He does survive, but Casey didn't know that.
- Why Did It Have to Be Snakes?: The Nickelodeon series gives him a fear of rats.
- Younger and Hipper: Just like with April, Renett, and Karai, The Nickelodean series had re-immagined Casey as a teenager who is the same age as the turtles (rather than being older than them just like in the other adaptations).
A mutant alligator/crocodile (depending on the incarnation) who fights, then befriends the turtles. Generally the subject of a lot of abuse.
Appears in: Most incarnations.
- Adaptational Villainy: His original cartoon incarnation was made a villain, and he starts out that way in the Archie comic until he becomes a Mutanimal.
- Animorphism: Archie comics.
- The Berserker: Mirage comics, 4Kids cartoon. The 2012 Cartoon turns it Up to Eleven.
- Berserk Button: in the 2012 Cartoon, the mere mention of the Kraang will put him in his berserker state.
- Catchphrase: "I guh-rantee!", Fred Wolf cartoon
- Dark and Troubled Past: The 2012 cartoon incarnation, big time.
- Emotional Bruiser: The 4Kids cartoon was quick to show off just how tender-hearted he is in addition to how tough he is.
- The 2012 cartoon also portrays him this way.
- Killed Off for Real: Archie comics.
- Metamorphosis: From human to humanoid alligator in the Archie comic book, from alligator to humanoid alligator everywhere else.
- Ragin' Cajun: Fred Wolf cartoon.
- Sewer Gator: In some versions, he was a pet alligator that was flushed into the sewers before he was mutated.
- Those Two Bad Guys: Every episode that featured him in the Fred Wolf cartoon(with the exception of his debut appearance) had him paired with the Rat King.
- You Can't Go Home Again: In the Mirage and 4Kids cartoon continuities, Leatherhead initially yearns to rejoin the Utroms.
Professor Honeycutt/The Fugitoid
A scientist whose mind was accidentally transferred into a robot's body, and is forced on the run by groups who would use his inventions for their own purposes.
Appears in: Mirage comics, 4Kids cartoon, Nick cartoon, IDW Comics.
- Brain Uploading: The most commonly accepted explanation for his existence, although doubts are eventually raised as to whether this is the case.
- Just a Machine: Although it's not true, he is considered this by The Federation.
- Instant A.I., Just Add Water: The alternate explanation as to his origins used in Mirage comics.
- Took a Level in Badass: Once he gets his battle form in volume 4 of the comics.
- Transforming Mecha: In volume 4 of the comics. Transformations include his battle form, and wings that allow him to fly.
An apprentice "Timestress" whose job it is to oversee and protect the timestream.
Appears in: Mirage comics, 4Kids cartoon, Nick cartoon, IDW Comics
- Character Development: (Mirage) Initially a ditzy, irresponsible and overly impulsive girl, she eventually evolves into a mature, responsible and self-reliant woman — after having spent some time as grim-faced, solemn and reluctant. What makes it confusing is that, thanks to her traveling back and forth through time, we don't necessarily see this development in chronological order.
- In fact, we're informed that her parents originally made her take the job as an apprentice timestress in the hope that she would undergo some much-needed Character Development.
- Deus ex Machina: In the Mirage comic Juliet's Revenge the fully-adult, post-Character Development Renet plays this role (having changed so much that the Turtles don't recognize her at first). For the most part, however, she averts this.
- The Ditz: In her pre-Character Development appearances.
- Dumb Blonde: Again, pre-Character Development she's the embodiment of this trope.
- Forgotten Phlebotinum: She's completely and inexplicably absent from the Fast Forward season of the 4Kids cartoon, where the Turtles are stuck in the future — because if she'd appeared she could instantly have fixed their predicament.
- Ms. Fanservice: (Mirage) About the only thing that stays consistent about her appearance is her huge breasts and tendency to wear (Nickelodeon version) skintight (and sometimes rather revealing in the terms of the Mirage version and 4Kids version) clothes.
- Most Common Superpower: It's especially prominent in the Mirage comic (especially if Jim Lawson is drawing her), but the 4Kids cartoon version is notably endowed as well.
- Despite the fact that the Nickelodeon series had re-imagined her into being a teenager, Renet is still very well-endowed.
- Shout-Out: The third movie prominently features a time travel scepter that looks very similar to Renet's.
- Took a Level in Badass: (Mirage) It's a long way from the Distressed Damsel we're first introduced to, to the nearly god-like woman who shows up to save the Turtles from certain death.
- True Blue Femininity: Her outfit is mostly blue and it matches her Innocent Blue Eyes.
- Valley Girl: Her speech in the 4kids cartoon is this.
A skateborading gecko who is friends with Michaelangelo
Appears in: Fred Wolf Cartoon, Archie Comics, IDW Comics, Nick Cartoon
- Heel–Face Turn: In the Fred Wolf crtoon, he used to be a criminal
- Killed Off for Real: Archie comics
- Metamorphosis: gecko to anthro gecko (Fred Wolf), human to antho gecko (Archie and Nick cartoon)
- Soapbox Sadie: Archie comic
A Ninja Master with ties to the New York underworld, and the franchise's most visible villain. In most incarnations, his name is Oroku Saki and he and Hamato Yoshi fought over the same woman until his attempt to Murder the Hypotenuse ended in disaster, though variations of course exist and the 4Kids cartoon notably discards that origin entirely.
Appears in: All incarnations.
- Arch-Enemy: For starters, the Turtles are usually trained by Splinter so he can exact vengeance on Shredder.
- Adaptational Badass: The movie, 4Kids and Nickelodeon versions are far more capable and dangerous than the Mirage or Fred Wolf versions of the character.
- Adaptational Villainy: The 4Kids version is far more malicious than any other versions (although Movie Shredder comes close).
- To an extent, all versions coming after the Mirage comics are subject to this trope: while Shredder was by no mean a nice person in the original comic (he was an Arrogant Kung-Fu Guy who had no scruples about bringing his minions when challenged to a duel and tried to kill the Turtles along with him rather than face a honorable death), his sole mentioned crime was the murder of Hamato Yoshi (which he had more or less legitimate reasons for). Most adaptations that followed made him more into a straight villain and gave him an additional more villainous goal, typically World Domination. Of course, the Mirage Shredder was still a crimelord.
- Avenging the Villain: Not any villain we're familar with, mind you, but Hamato Yoshis enemy, Oroko Nagi, Shredders brother. After Nagi tried to kill Tang Shen, a woman who had chosen Yoshi over him, Yoshi killed him. Shredder would spend the next ten years obsessively training and rising in the ranks of the Foot for the sole purpose of pursuing Yoshi to America and kill him.
- Authority Equals Ass Kicking: As many entries here show, he's tough enough to prove why the Foot have him as leader.
- Back from the Dead: Mirage comics, 2nd movie, 4Kids cartoon, IDW comics.
- Badass Abnormal: In the 2014 movie, he's an incredibly skilled ninja master but his human-level stats are clearly no match for four mutant Turtles with superhuman strength and durability. Luckily for him, he wears a powerful robotic suit of armor which evens the odds and allows him to go toe-to-toe with Splinter and the Turtles.
- Badass Normal: With the exception of some of the 4Kids Shredders, all versions of the Shredder are perfectly normal humans, yet remarkable fighters.
- Big Bad Duumvirate: With Krang in the Fred Wolf cartoon.
- Big Bad Ensemble: So far sharing this with the Kraangs in the Nickelodeon version, as both of them have served as the main recurring threats and played a part in the turtles' origin.
- Blade Below the Shoulder: His trademark weapon.
- Breakout Villain: In the very first comic, he perishes. In all other media he's the main nasty (or was in their backstory).
- The Bus Came Back: Both Shredders return in Turtles Forever.
- Catch Phrase: 4Kids cartoon: "None of you will leave here/this place alive!"
- As Leonardo later points out "Seems like he's always trying to make sure we never leave anywhere alive."
- Also, in both the comic and the 4Kids cartoon: "Now, come and face your doom!"
- Chuck Cunningham Syndrome: He is not even mentioned in the third film.
- Composite Character: In the first movie and the Nickelodeon cartoon, it is Saki himself who fights Yoshi over the love of Tang Shen, as opposed to his brother Nagi.
- In the 4Kids cartoon, he's a small alien named Ch'rell posing as Saki using a humanoid robot body. This makes him resemble a hybrid of his usual self and Krang from the previous cartoon, but Krang was created for the older show while Ch'rell is one of the Utroms, a race from the original Mirage comics.
- Corrupt Corporate Executive: 4Kids cartoon.
- Briefly in the Fred Wolf cartoon, as chairman of Octopus Inc.
- Darth Vader Clone: Bucket helmet: Check. Mask: Check. Cape: Varies, but Check.
- Dead Person Impersonation: Ch'rell, in the 4Kids version. Oroku Saki later turns out to be more alive than expected.
- Decomposite Character: The 4Kids cartoon has two versions of Oroku Saki - the Utrom Shredder and the Tengu (Demon) Shredder, who had his shtick co-opted by the former.
- Demoted to Extra: In Next Mutation, the third and fourth movies, most of the later issues of the Archie Comics, and the ninth and tenth seasons of the Fred Wolf animated series.
- The Dragon: To Karai in the Mirage version, not that it would have stopped her from using the title of Shredder herself had Image Comics' non-canon volume been followed up on.
- The Dreaded: (4Kids Version) Even after defeating him several times, just hearing that Ch'rell is involved in something is enough to make the turtles nervous about their chances of survival.
- The Nickelodeon version seems to be on his way to be this as well. Splinter had a nightmare of him slaughtering the turtles.
- Evil Is Petty: There is almost nothing he wouldn't do to hurt the turtles. Movie Shredder even takes sadistic glee in taunting them over Splinter's supposed death.
- Evil Me Scares Me: The Fred Wolf version is terrified of the 4Kids version when he meets him in Turtles Forever.
- Evil Overlord: Tengu, 4Kids cartoon.
- The Utrom Shredder was one in an alternate Bad Future. Even before that there was an episode in the 1987 cartoon with the same premise of Shredder being ruler of the world in a Bad Future, however, due to the decay he suffered in that version, he was more inept than evil on that occasion and even wanted to go to a world where he wasn't ruler.
- In the real world in the Fred Wolf cartoon, however, he seemed to be quite competent as the chairman of a large corporation (Octopus Inc) which he took over, and had some success.
- Evil vs. Evil: In The 4Kids cartoon The Utrom Shredder went up against The Tengu Shredder also in the beginning of the final season when The Turtles are traveling through time they come across a battle between The Utrom Shredder, The Cyber Shredder, and The Tengu Shredder. And in Turtles Forever The 1987 Shredder and Krang team up with The Turtles and Karai to take down Ch'rell The Utrom Shredder
- Fatal Flaw: The 4Kids Turtles state that no matter which universe Shredder is from, the one constant is his massive ego.
- Flunky Boss: The 2003 version almost always has some goons the Turtles have to fight through first before engaging him. In fact, almost every fight with him on his terms has him either using Foot ninjas to wear down the enemy before he arrives, or to distract them so he can launch surprise attacks.
- Good Scars, Evil Scars: Almost every incarnation has a mark, usually caused by Splinter.
- Hoist by His Own Petard: Mirage comics, Turtles Forever.
- Invincible Villain: In every version, the Shredder is intially too much for the turtles to handle, leaving Splinter to save the day, with the exception of the Mirage version, where Splinter never battles him personally, and he is killed by Leonardo in both his appearances and the 2014 movie where Splinter does fight him but is defeated and later on, all four Turtles have to battle him together for the first time and, despite having trouble with him initially, eventually come up with a strategy that's able to beat back the Shredder.
- The Tengu Shredder in the 4Kids version took this to absurd levels. He can fire dark energy out of his hands, warp reality, materialize weapons out of thin air, heal himself, and transform into a dragon. Even before he turned to a life of evil, his martial arts skills were unmatched and during his first defeat, he could only be locked in a sarcophagus rather than being killed since his dark powers were too strong. On top of all that the only person who could severely weaken him to give the turtles a fighting chance was Yoshi, someone who was already dead.
- The Cyber-Shredder turned into this in his final few appearances, completely curbstomping everybody in his path, including all the Turtles, the Justice Force, and even taking out one of the Ninja Tribunal, someone he should logically have no chance of beating, considering the Ninja Tribunal's level of power, fighting experience, and mystical abilities.
- The Shredder from the 2012 series thrives on being this, being able to destroy all four Turtles in battle in his initial appearance. Even three seasons later, the Turtles struggle to land so much as a single blow on him. He can even fight the combined might of the Turtles and Mutanimals and still put a hurting on all of them. Plus, he can take a brutal mauling from Leatherhead and get back from it almost a split second later to put the mutant crocodile down. And he can take out multiple Triceraton soldiers despite how durable and powerful they've been shown to be. And it really doesn't help that thus far, practically every season has ended with some sort of villain victory for the Shredder where he gets the last laugh(season one), seriously injures one or more of the heroes(season two), or some combination thereof(season three).
- The Tengu Shredder in the 4Kids version took this to absurd levels. He can fire dark energy out of his hands, warp reality, materialize weapons out of thin air, heal himself, and transform into a dragon. Even before he turned to a life of evil, his martial arts skills were unmatched and during his first defeat, he could only be locked in a sarcophagus rather than being killed since his dark powers were too strong. On top of all that the only person who could severely weaken him to give the turtles a fighting chance was Yoshi, someone who was already dead.
- Killed Off for Real: Mirage, all incarnations in 4Kids (except Karai), IDW
- Knight of Cerebus: In all adaptions except the Fred Wolf series (while still a potential threat and skilled at martial arts, he was just as silly as everyone else) and Mirage comic (which was already pretty dark).
- Large Ham: Just about every incarnation of the character is.
- In the Fred Wolf animated series, he is especially hammy in episodes where he is voiced by Dorian Harewood.
- Left for Dead: A lot (4Kids series), bordering on Joker Immunity. The turtles even lampshade that he never seemed to die.
- Legacy Character: Several characters end up taking the identity.
- Multi Layer Facade: In The 4Kids cartoon, he's got a public identity which is Oroku Saki, the rich and well respected Japanese Businessman. Then he's the Shredder, a warlord who is using his public persona to gain power. And then his true identity originally only known by his adoptive daughter Karai is Ch'rell, an Utrom criminal who has been on Earth for over a millennium.
- Omnicidal Maniac: Turtles Forever, where he's willing to destroy the entire multiverse, including himself, if it meant killing all existing ninja turtles. That includes his own daughter.
- One-Winged Angel: Super Shredder in the movies and video games during the Fred Wolf cartoon era.Utrom Shredder simply has enlarged exo-suits, and the one he had in Turtles Forever could turn into a giant, Demon Shredder can turn into a dragon. In the two-episode anime loosely based on the Fred Wolf cartoon, the Shredder was also able to use the Dark Mutastone to transform into the dragon-like Devil Shredder and the much larger Dark Devil Shredder in the first episode, as well as one of the Mirror Mutastones in the second episode to become Metal Shredder.
- Pet the Dog:
- 4Kids cartoon. Overlaps with Papa Wolf, surprisingly. He seems to hold genuine concern for his adoptive daughter Karai. Until she refused to let him kill the Turtles.
- In at least the 4Kids and Nickelodeon series, despite his track record for severely punishing failure Shredder often turns a blind eye to Karai's outright defying his orders, at most making empty threats about how she better not do it again.
- Physical God: Demon Shredder in the 4Kids cartoon.
- Pragmatic Villainy: Nick cartoon. Despite Baxter Stockman's Mousers losing them a chance at finding the turtle's lair, Shredder thinks killing him would be wasting his talents he could use.
- Put on a Bus: Fred Wolf and 4Kids cartoons (Utrom).
- Really 700 Years Old: 4Kids cartoon (due to being an alien), IDW comics (due to alien ooze and magic).
- Reincarnation: In the IDW comics, Oroku Saki is the reincarnation of the founder of the Foot Clan, Tatsuo Takeshi.
- A Sinister Clue: His signature weapon is always on his left hand if he doesn't have two sets.
- Spikes of Villainy
- Super Strength: 4Kids cartoon.
- Take Over the World
- Tin Tyrant: 4Kids cartoon. While a few other incarnations come close (such as in the movies and the Nick cartoon), the armor and attitude of that one fit the trope better.
- Touched by Vorlons: 4Kids cartoon.
- Villain with Good Publicity: 4Kids cartoon.
- We Used to Be Friends: Wolf and Nick cartoon, with Yoshi/Splinter.
The Foot Clan
An ancient order of shinobi, assassains and spies dating back to medieval Japan. In present day, they have semi-independent chapters all over the world, overseen by the japanese head council.
Appears In: Mirage Comics, Fred Wolf Cartoon, 4Kids Cartoon, the first two live action films, the 2007 film, 2014 live action film, Nick cartoon and IDW Comics
- Avenging the Villain: The Foot are honor-bound to avenge the death of The Shredder, but agree to void the blood debt if the Turtles assist in bringing order to the New York branch.
- Conservation of Ninjutsu: Ridiculously prone to this.
- Cyber Ninja: The Foot Tech Ninja in the 2003 cartoon, which grants them invisibility. Also, the Fred Wolf cartoon ones, which were entirerly robotic so the Turtles could destroy them without censorship.
- Faceless Mooks: The rank and file ninja have virtually no defining characteristics.
- Horrible Judge of Character: The Foot elders gave The Shredder the job of starting the New York Foot, which he proceeded to run like his personal fiefdom, after indulging in a personal grudge against Hamato Yoshi.
- Ninja: They're generally ninjas, trained by Shredder.
- Nice Job Breaking It, Hero: A time travel adventure in the Mirage Comics shows that the Foot would never have existed had not Raphael taught a pair of ronin warriors ninjitsu. After the Turtles leave, the ronin set out to form their own clan, stating that "just as every journey begins with one step, so we shall call ourselves the Foot".
- The Remnant: During the last few issues of the Mirage comic book, before Nickelodeon bought the rights, its revealed that the Foot has been devastated by a mysterious enemy, and the New York branch is all that remain.
A high-ranking member of the Foot Clan (in Mirage comics she's the leader of the Foot).
Appears in: Mirage comics, Volume 3, 4Kids cartoon, 2007 TMNT animated film, 2014 Live Action Film, Nick cartoon, IDW Comics.
- Ambiguously Evil: How ambiguously exactly varies with the versions, but she typically is this in all versions.
- Is more outwardly evil in the IDW comics, being the one who resurrects the Shredder and the modern Foot Clan, acting as his second in command.
- Anime Hair: The Nickeldeon version; she has black hair in the front and blonde hair in the back.
- Anti-Villain: Rarely holds any enmity towards the turtles, fighting them on Shredder's orders.
- Avenging the Villain: Her motivation for fighting the Turtles in the 4Kids cartoon after they defeated Shredder.
- Averted in the Mirage Comics version, where she is instead tasked by the japanese leaders of the clan with stopping the blood feud between the Turtles and the remnants of Shredders elite ninja, to bring order back to the New York faction of the Foot.
- Broken Bird: In seasons 4 and 5 of the 4Kids 'toon.
- Co Dragon: After her introduction, she shares the role of The Dragon with Hun.
- Corrupt Corporate Executive: 4Kids 'toon and IDW comics version once she takes over her father's enterprise.
- Daddy's Little Villain: In the 4Kids 'toon and Nickelodeon show, she actually is the Shredder's foster daughter.
- Dark Action Girl: Can usually take any one of the turtles head to head, though not all four like Shredder frequently can.
- Deadpan Snarker: While the comic and 4Kids' incarnations of the character are mostly serious and stoic, the Nickelodeon version is much more inclined to taunt and snark, even in front of Shredder.Shredder: I heard you had the occasion to slay Leonardo, but let him go.Karai: That's not true. He escaped.Shredder: I find that hard to believe.Karai (grinning): He escaped from you, didn't he?
- Demoted to Dragon: Ultimately, this is the progression of her character. Originally, Karai was a Foot Clan commander on the same level as the Shredder, sent by their mutual commanders in Japan to clean up his messes. In every version since, she always portrayed as his trusted subordinate, many times his daughter or relative, and her overall importance in Foot hierarchy is reduced.
- The Dragon: Is this firmly in the IDW Comic.
- Dragon Ascendant: In the 4Kids cartoon, after Shredder's defeat she takes the mantle for her own.
- Enigmatic Minion: 4Kids cartoon, 2007 movie.
- Foil: A Shadow Archetype to Leonardo. IDW plays this up by having Shredder promote Leo into being Shredder's successor over her, despite Karai being Shredder's number two. This later turns out to be a test of loyalty for Karai, which she passed.
- Heel–Face Turn: 4Kids cartoon, though it doesn't happens until season 5.
- It Amused Me: The Nickelodeon version of the character doesn't really seems to care whether what she does is right or wrong, and is mostly concerned about finding entertainment. That includes fighting with Leo but letting him leave and trying to steal a sword from a collector.
- Leitmotif: 4Kids cartoon.
- Luke, I Am Your Father: In the Nick cartoon, she finds her biological father is Hamato Yoshi aka Splinter.
- Self-Made Orphan: Subverted. Though the IDW version of Karai wrested control of the Foot from her father, she did not kill him herself. Rather, it was the stress from the incident that did him in.
- Shoulders of Doom: 4Kids cartoon, as Shredder.
- Spikes of Doom: 4Kids cartoon, as Shredder.
- Tin Tyrant: 4Kids cartoon, when she takes over the Shredder's mantle.
- Tykebomb: 4Kids cartoon, Nickelodeon show, IDW Comics.
- Undying Loyalty: This is, in the 4Kids Cartoon, what prevents her to make a Heel–Face Turn for most of the series; She genuinely respects the Turtles, almost has a friendship with Leonardo and knows to some extent that the Shredder's motives aren't exactly pure, but due to the role he played in her life, she feels like she owes him, and stays by his side no matter what. Even when he actually is defeated, she ends up blaming the turtles for it and going on a Roaring Rampage of Revenge against them. Eventually, it takes the Shredder trying to destroy the Universe (him and her included) to make her leave him once and for all.
- Now once again in the IDW Comics, she is completely and utterly loyal to the Shredder, but this time, seems to lack the rapport she had with the turtles in other versions.
- The Vamp: In the Nickeldeon Cartoon, she has shades of this toward Leo.
- Woman Behind the Man: In the Mirage Comics version she's this to the Shredder due to being one of the Japanese leaders of the Foot that Shredder answers to.
- Worthy Opponent: To the Turtles in general, but typically to Leo.
- Younger and Hipper: Seems to get younger in each adaptation. In the Mirage comics, she was old enough to have a teenage daughter. In the 4Kids, she appears to be a young adult; and the Nick shows, she's a a teenager the same age than the Turtles.
- Completely averted in the films. Karai in TMNT appears to be much older than most other versions, on account of her design and the delivery of her voice actress, Zhang Ziyi. In the Live Action 2014 film, she is clearly played by an older looking actress (who was born in '73), instead of a younger one.
- You Killed My Father: In the Mirage version. After the Shredder Elite murders her daughter, she allies with the Turtles to bring an end to the Foot civil war and avenge her child.
- Hideously mutated clones of The Shredder, dressed in modified Shredder armor and trained to work as elite Foot soldiers.'''Appears in: The Mirage Comics, the 2003 cartoon, the 2012 cartoon
- Big, Thin, Short Trio: Shiva-Shredder is huge and hulking, Claws is thin and lean and Shrimp is short.
- Body Horror: BIG time, especially in the original comic version where they were the first few experiments at resurrecting the Shredder using clone worms. Its probably a good thing they are never seen without masks.
- Claws takes it an extra notch, he doesnt even have HANDS, his arms are horrific, lumped pincer claws.
- Fragile Speedster: Owing to his size, Shrimp is incredibly fast, but not as strong as the others.
- Flat Character: Besides their individual design, the three have no personality whatsoever, they're not even capable of speech.
- Lean and Mean: Claws is notably slimmer than his "brothers".
- Multi-Armed and Dangerous: Shiva-Shredder has four arms, each equipped with shredder claws.
- Elite ninjas of the Foot and the Shredders personal body guards and lieutenants.Appears in: The Mirage Comics, the 2003 Cartoon, IDW Comics
- Avenging the Villain: After the Shredders death at the hands of the Turtles, the remaining Elites swear a vendetta against both them, and the factions of the Foot now fighting for control over New York.
- The Dreaded: Becomes this to Leonardo in the 2003 cartoon after the savage beatdown he recieves at their hands. They are not present in the comic book version of the storyline.
- Driven to Suicide: In the comics, one of the Elites falls for Karais disguise as the Shredder, and obeys her command of committing suicide for dishonoring himself.
- Elite Mook: In all versions, they serve as the absolute best fighters of the Foot, second only to Shredder himself.
- Enemy Civil War: They strike at all parties involved in the war over the New York underworld, including the Japanese Foot.
- Flat Character: None of them really have any character traits beyond their blind loyalty to the Shredder. In the cartoon each Elite has a unique weapon, an axe, a spear, a poleaxe and a doublebladed sword, but thats about it.
- The Remnant: Theyre the only remaining faction still loyal to the Shredder, and also the remnant of the elites themselves, as some were killed during the Return To New York storyarc in the comics.
- Would Hurt a Child: Comics only, they murder Karai's teenage daughter.
Mad scientist and creator of the mouser robots. Never quite seems to remain whole (or even human, in some versions).
Appears in: Most incarnations.
- Adaptational Heroism: Downplayed in both adaptations. While his comic counterpart was a one-dimensional monster to the end, 1987 Baxter is a well-meaning, yet misguided scientist. He's still a pretty awful person in the 2003 cartoon, but gradually grows more and more pitiful, to the point where he wants his miserable existence to end.
- An Arm and a Leg: ...and an eye, and another arm and another leg and so forth...until he's reduced to a literal Brain in a Jar in the 4Kids version.
- Animorphism: His Fred Wolf 'toon incarnation eventually gets turned into a fly.
- Anti-Villain: Eventually, in the 4Kids cartoon. He started out as one in the Fred Wolf cartoon but went crazy when he became a fly.
- Attention Deficit... Ooh, Shiny!: In the Fred Wolf cartoon, in his later episodes he would sometimes suffer from this due to having the mind and attention span of a fly.
- Back from the Dead: 4Kids cartoon.
- Black and Nerdy: Except in the 80's cartoon.
- Body Horror: In 4Kids' "Insane in the Membrane," after four seasons of losing body parts, Baxter Stockman finally obtains a new body via cloning. Soon enough, however, he discovers that it's unstable, as his limbs start deteriorating and melting off. His mind had gone with it before being retrieved and placed back in his jar.
- His fly-man form from the Fred Wolf and Nickelodeon cartoons isn't exactly pretty, either.
- Brain in a Jar: Mirage comics, 4Kids cartoon. Self-inflicted in the Mirage version, a result of his gruesome mutilation in the cartoon.
- Break the Haughty: 4kids version: Pretty much his entire career is this, but "Insane In The Membrane" is where it really sinks in.
- Butt Monkey: Gradually in both the Fred Wolf and 4Kids cartoons. The Nickelodeon cartoon does this right off the bat.
- Cut Lex Luthor a Check: Invoked in the Mirage comic; April points out that Stockman has had a perfectly profitable business selling his Mousers as pest exterminators. He exclaims that using them to terrorize people is just more fun.
- In the Fred Wolf cartoon, Baxter starts out trying to sell his Mousers to exterminators, but no one was willing to invest. Ironically, it wasn't because they thought the Mousers wouldn't work, but that they would work way too well and put the exterminators out of business.
- Determinator: Particularly notable in the 2003 version. He never seems to lose his smug edge or ability to concoct new schemes, no matter how many limbs get cut off. The Black Knight would be impressed.
- The Dragon: He was briefly this to the Shredder in the Fred Wolf cartoon, prior to his transformation.
- Evil Is Hammy: Especially in the comics, where he's his own scheming villain, but even in the cartoons he's often prone to giddy gloating even when nobody is listening.
- Evil Mentor: For April in the 4Kids cartoon.
- For the Evulz: His original motivation in the comics.
- Four Eyes, Zero Soul: In most continuities, he wears glasses.
- Hoist by His Own Petard (4Kids cartoon): In "Return to New York".
- Horrible Judge of Character: In the Fred Wolf cartoon, he agrees to help Shredder even though he approaches him on the streets in his full villainous garb and it gets worse from there. Even when Baxter turns into a fly as a result of Shredder sending him to Dimension X, as all it takes for Baxter to change from wanting revenge on Shredder to wanting revenge on the turtles is Shredder telling him that it was the turtles' fault.
- Hypocrite: In the 4kids toon, he calls mutants like the turtles "stupid freaks." This coming from a talking head in a robot body. The 4kids version is notoriously vain, so it fits him perfectly.
- I Just Want to Be Normal: His motivation in both cartoons. Ironically in the 4Kids cartoon he actually does eventually get his body back while in the Lighter and Softer series, he ends up trapped forever in dimensional limbo.
- Implacable Man: In the 2003 version at least; Lampshaded by Leonardo and Shredder:Leonardo: What do we have to do, to stop this guy?Shredder: I have asked myself that question many times.
- Irony: Interestingly, in the original TV Show, he ended up getting a Fate Worse Than Death, in a Lighter and Softer show, while in the darker show, not really mattering since Fast Forward still had Dark elements, Baxter gets a somewhat happier ending.
- Killed Off for Real: Mirage series.
- Metamorphosis: From human to giant fly, in the Fred Wolf and Nickelodeon cartoons.
- Not-So-Harmless Villain: In the Nick cartoon, he treads the line between this and Ineffectual Sympathetic Villain.
- Omnidisciplinary Scientist: His primary field is usually robotics, evidenced by his famous Mousers, but he'll show expertise in everything from genetics to archaeology as suits the plot.
- Race Lift: The Fred Wolf cartoon and the Archie Comics series loosely based on it both depict him as a Caucasian.
- Sanity Slippage: In every version, he grows more and more unstable after his transformation. Best demonstrated in "Insane In The Membrane".
- The Starscream: To the Shredder, in the 4Kids cartoon.
- He also had shades of this in the Fred Wolf series, using the powers of the Eye of Sarnath for himself in "Curse of the Evil Eye" to get back at Shredder for bullying and abusing him, and later turning on him completely after turning into a fly mutant in "Enter the Fly".
- Spared by the Adaptation: Downplayed horribly in the 2003 version. He doesn't die...but he really wishes he was.
- Third-Person Person: The 4Kids version is prone to this when gloating.
- Used to Be a Sweet Kid: In the 4Kids series. He used to be a fairly benevolent and principled scientist too until his ego and arrogance got the better of him.
- Was Once a Man: With the exception of the IDW comics, he never stays human.
- We Can Rebuild Him: Mirage Comics, 4Kids series.
- Wetware CPU (Mirage Comics, 4Kids series): As loses more and more of his body, Baxter begins becoming this.
An alien general fighting a losing war, and who turns to Earth for assistance. A small, brain-like creature, he often uses a robotic exoskeleton to move around.
Appears in: Fred Wolf cartoon, Archie comics, IDW Comics, Nick cartoon (as "the Kraang").
- Big Bad: Along with the Shredder (Fred Wolf series).
- Big Bad Ensemble: With the Shredder in the Nick cartoon.
- Bizarre Alien Biology: His brain, having been scooped out of its original skull, can survive perfectly well on its own in the open air and has primitive arms (tentacles), eyes and a fang-filled mouth in its own right.
- The Cameo: In one episode of the 4Kids cartoon.
- Canon Foreigner: Began as a creation of the Fred Wolf cartoon, where he merely looked like the Utroms, but has since been used in other series.
- Dark Lord on Life Support: Krang's android body is a variation. He doesn't need it to survive, just needs it to survive as anything but a barely mobile brain-like creature.
- Ditto Aliens: They're a race of similar looking aliens, not unlike the Utroms, in the Nickelodeon series (spelled as "Kraang").
- Evil Sounds Deep: In the Random House audiotape versions of the Archie Comics series, Krang had a rather deep voice that sounded very similar to that of Dr. Claw's, as opposed to the higher-pitched voice he had in the Fred Wolf cartoon.
- The Exile: (Fred Wolf Cartoon, Archie Comics) Part of his backstory is that he's an exiled warlord from Dimension X.
- Expy: of the Utroms and Triceratrons.
- Fat Bastard: Rides a mech suit resembling one.
- Genius Cripple: Sure, he's a genius. (His IQ is in the 900s) But as a brain, there's not much he can do on his own. Without his biosuit, he's pretty much helpless.
- Insufferable Genius: Krang is brilliant, but not easy to work with. He insults and belittles Shredder all the time, and goes out of his way to make things difficult for his allies when he thinks he can get away with it. For example, in (Fred Wolf Cartoon) 'The Return Of The Shredder' while he allows Shredder to return to New York, but denies him any tech or help, forcing Shredder to work on his own. Then there's his reasons for preventing Bebop and Rocksteady to return as well;"Because, I enjoy watching people and animals suffer! And you, my friends, are both!"
- Laughably Evil: In the original cartoon and Archie comics.
- Leitmotif: Has one in the original cartoon and a remixed version of it plays in the video games where he's fought as a boss.
- Mark of Shame: (Fred Wolf Cartoon) He was reduced to his brain-like state by the people who exiled him, and he is quite embarrassed about it.
- Put on a Bus: Fred Wolf series, Archie Comics.
- Reptiles Are Abhorrent: In the Fred Wolf cartoon, the episode "Invasion of the Krangezoids" shows us what Krang originally looked like — essentially a vaguely anthropomorphic Tyrannosaurus Rex with an overlarge cranium.
- Spell My Name with an "S": The namesake race in the Nickelodeon series spell the name as "Kraang" rather than "Krang".
- Starter Villain: Nick cartoon.
The Rat King
A man dressed up in rags and bandages who shares a rapport with rats. Varies wildly within incarnations—descriptions for each can be seen in the other Wiki.
Appears in: Mirage comics, Fred Wolf cartoon, Archie comics, 4Kids cartoon, Nick cartoon, IDW Comics
- Ascended Extra: He was a Monster of the Week who died in his first appearance. Didn't stop him from becoming one of the turtles' most prominent adversaries.
- Ax-Crazy: During his debut in both the Mirage comics and 4Kids series.
- Badass Longcoat: Wears one during his single appearance in the Red Sky seasons, "Wrath of the Rat King".
- Beast Man: Mirage Comics, 4Kids series.
- Dead All Along: During the "City at War" arc (Mirage series).
- Healing Factor: As The Slayer (4Kids series).
- Invisibility: As The Slayer (4Kids series).
- Karma Houdini: In the Fred Wolf cartoon, though subverted in "Leatherhead Meets the Rat King" when he ends up trapped in a cave-in, as well as in his last appearance where he is finally captured by the Turtles, and also episodes where he plays a neutral role, since he isn't really doing anything wrong then.
- Killed Off for Real: Mirage
- Magic Music: In the Fred Wolf series, where he used a flute to control rats.
- Mind Control: Over rats, in the Fred Wolf series, Archie series. Over everyone in the IDW Comics.
- His 2012 version does this in a more creepy fashion even performing a Mind Rape on Splinter
- Mix-and-Match Man: 4Kids series.
- Super Soldier: His Slayer persona was designed to be one (4Kids series).
- Those Two Bad Guys: In some of his appearances in the Fred Wolf cartoon, he teamed up with Leatherhead.
- Villain Exit Stage Left: In the Fred Wolf cartoons, he would often escape after the Turtles defeated him, and it was not uncommon for him to bail out in episodes where he teamed up with other villains. Averted in "Leatherhead Meets the Rat King" and "Wrath of the Rat King".
Bebop and Rocksteady
Human gang members who were mutated into a warthog and rhino respectively, and serve as henchmen to the Shredder. Neither of them are particularly bright.
Appear in: Fred Wolf cartoon, Archie comics, IDW Comics, and Nick cartoon.
- Adaptational Badass: While still idiots, the IDW incarnations of Bebop and Rocksteady are noticeably far more dangerous than their 1987 cartoon counterparts. Then comes the Nick cartoon, where they're not idiots, and Bebop has access to all sorts of powerful and useful technology, such as an invisibility suit.
- Animorphism: Were transformed from humans to humanoid animals by the mutagen. In the Archie comics, this eventually starts influencing their mind.
- Bald of Evil: Rocksteady had blonde hair in his human form, but he inexplicably went bald after he mutated into a rhino. The Nick cartoon has him bald as a human, though.
- Becoming the Mask: In the Archie comics series, the animal part of their natures began taking over more and more. This actually increased their intelligence, while also making them more neutral and less evil.
- Beware the Silly Ones: Initially, in the 1987 Fred Wolf cartoon; they're still Dumb Muscle, but they're also pretty tough and significantly stronger than the turtles, to the point that they could seriously threaten the turtles — they had to be out-thought rather than simply beaten up.
- Canon Foreigners: Created for the franchise as part of the Fred Wolf cartoons.
- Character Development: The Archie comics series gradually increased their intelligence and made them less evil as their animal natures took over more and more.
- Cool Shades: Bebop.
- Dual Boss: In a few of their video game appearances (namely the arcade games), they're fought as a pair.
- Dumb Muscle: Justified; they were always dimwitted punks and toughs, and Shredder simply tried to upgrade their physical prowess.
- Expressive Mask: Bebop's sunglasses were sometimes depicted in this manner, most notably in the Archie comic books.
- Flanderization: While they weren't exactly geniuses in the first season, they were still extreme physical threats to the turtles, especially in their second appearance after being mutated. From that point on, they became more or less ineffectual against them, and even some humans.
- Friendly Enemy: In their final appearance in the Archie comics series, they hijack the spaceship used by Krang and his henchmen to reach Earth, using their guns to "convince" the Turtles not to stop them. However, Bebop and Rocksteady cheerfully accept Leonardo's request to take Krang and his goons back to the prison planet they escaped from, before returning to the Eden-like planet they've made their new home.
- Goofy Print Underwear: In the Fred Wolf cartoon, Rocksteady is wearing heart-print boxers when Leonardo cuts through his belt.
- Harmless Villain: In the Fred Wolf cartoon, at least from the second season on. They were always idiots, but after the first season, their stupidity grew to the point they were completely ineffectual. They also became a lot more laid back and put-upon as well.
- Lightning Bruiser: They both possess incredible strength, power, toughness, as well as great speed.
- Mike Nelson, Destroyer of Worlds: In the Bebop & Rocksteady Destroy Everything miniseries as part of the IDW run, where after unwittingly stealing a time rod, they nearly destroy the entire space-time continuum almost entirely thought a combination of accident and irresponsible use of time travel. They damage they do cause is responsible for the destruction of roughly a million and a half universes.
- The Millstone: On many occasions Shredder may well have won if not for their bumbling. Of course then there would be no more show. They even end up costing Utrom Shredder an otherwise clear-cut victory in Turtles Forever.
- Musical Theme Naming: Bebop and rocksteady are actually styles of music.
- Pig Man: Bebop is a warthog mutant.
- Put on a Bus: Fred Wolf series, Archie comics.
- Race Lift: In the first issue of the Archie Comics series, Bebop's human form was depicted as Caucasian, though this was corrected in Archie and IDW's reprints of the comic. Bebop's human form was also made Caucasian for his figure in the Mutations toyline.
- Rhino Rampage: Rocksteady.
- Salt and Pepper: Rocksteady's human form was Caucasian and Bebop's was African American.
- Simpleton Voice: Both speak like this in the Fred Wolf cartoon.
- Super Strength: Bebop alone can singlehandedly pick up a car and throw it at the turtles. Rocksteady is implied to be even stronger. This is why it's so important that the Turtles can out-think them, as they're actually pretty dangerous if they can get a grip on you.
- Team Rocket Wins: Their final appearance in the Archie comics series has them convincing the Turtles not to fight simply by pointing their guns at them.
- Those Two Bad Guys
- A New York street gang consisting of mostly teenage thugs, thieves and killers.Appears in: Mirage Comics, 4kids Cartoon, Dreamwave Comics, IDW Comics, Nick cartoon
- Ascended Extra: Like the Shredder, the Purple Dragons were one-shot characters that appeared in the very first issue of the comic book, though unlike the Shredder, it would be decades before they became a permanent part of the Turtles rogue's gallery.
- Starter Villain: The very first opponents the Turtles fought.
Real name: Hunter Mason. A hulking, tattooed gangster who serves as the leader of the Purple Dragons street gang.
Appears in: Mirage comics, 4Kids cartoon, Dreamwave comics, IDW comics, Nick cartoon.
- Animorphism: To a mutant turtle, in Turtles Forever.
- Arch-Enemy: To Casey in most continuities. In the 4Kids cartoon, he killed Casey's father. In the IDW comic, he IS Casey's abusive father. His introduction in the Nickelodeon cartoon is A Day in the Limelight episode for Casey where the two manage to squarely land themselves on each other's bad side permanently.
- Authority Equals Asskicking: One of the two constants about him is that he always is the leader of the Purple Dragons, and the strongest in the gang.
- Badass Normal: A regular human with no mutation whatsoever, but still capable of giving a hard time to the Turtles of his own.
- Bruce Lee Clone: In the Nickelodeon series.
- The Brute: He is not stupid, but still, he is the Shredder's biggest and strongest enforcer.
- Canon Immigrant: He was originally created for the 4Kids show, but got popular enough to be adapted back into the comics, and later introduced (though considerably different) in the Nickeldeon cartoon.
- Hun himself is based on an unused character named Copperhead for Mirage comics.
- Catchphrase: "Oh, crud" (4Kids series).
- Composite Character: Becomes Casey Jones's father in the IDW comics - ironically the very man he killed in the 4Kids show.
- The Dragon: To Shredder in the 4Kids series, though he eventually becoming Co Dragon alongside Karai.
- Empowered Badass Normal: In Turtles Forever.
- Karmic Transformation: In Turtles Forever, he ends up mutated into a Slash-esque Turtle after being in contact with both 2003 Raph and the old cartoon's Mutagen. To say he doesn't take it well would be quite an understatement.
- Large and in Charge: In the 4Kids series. Averted in the Nickeldeon cartoon, where he is of average size (though still a skilled fighter).
- Lightning Bruiser: Don't let his size fool you, Hun is astonishingly fast—more than fast enough to be a match for the turtles.
- Race Lift: In the Nickelodeon cartoon, where the Purple Dragons are firmly an Asian gang.
- Tattooed Crook: The second constant about him; In the 4Kids cartoon, he sports twin tattoos of the Foot and Purple Dragon symbols, removing the former after he leaves the organization for good. In the comic books, he sports a dragon tattoo on his right arm and hand, an one of a human vertebra over his left arm and back. Finally, in the Nickeldeon cartoon, he sports dragon tattoos on his arms.
- Would Hit a Girl: He was willing to hit April, hoping that losing her would cause the turtles to lose their fighting spirit. In City At War, Part 3, Hun smacks Karai around with a support beam.
A humanoid turtle with a fondness for palm trees.
Appears in: Fred Wolf cartoon, Archie Comics, IDW Comics, Nick cartoon.
- Anti-Hero: In most continuities he tends to be this rather than an out-and-out villain, though he usually starts out as an antagonist to the Turtles.
- The Berserker: He makes Raphael seem mild and gentle in comparison.
- Evil Counterpart: To the turtles, though in most continuities he's really more misguided than actually evil.
- Evil Knockoff: In the IDW comics, Slash was specifically created to track down the turtles.
- Heel–Face Turn: In the Archie comics and Nick cartoon, where he eventually ends up with the Mutanimals. In the IDW comics, where he ends up befriending Michelangelo.
- Heroic Sacrifice: In the Archie comics, he fights Malignas' forces as her ship plummets into the sun, in order to give the turtles a chance to escape.
- The Nose Knows: In the Nick cartoon; he can track down mutagen by scent from miles away.
- Would Not Shoot a Civilian: In the Nick Cartoon.
Tokka and Rahzar
A snapping turtle (Tokka) and wolf (Rahzar) mutated by the Shredder.
Appears in: Films, Fred wolf cartoon, 4Kids cartoon, Nick cartoon (Rahzar only; Tokka shows up as an unrelated character in season 4).
- Adaptational Badass: Rahzar's Nick cartoon incarnation is much faster and more intelligent than how he usually is portrayed.
- Advertised Extras: In Turtles Forever.
- Canon Immigrants: From the movie to the Fred Wolf cartoon, more intelligent and more eloquent. They were also featured in the 4Kids cartoon via Turtles Forever and featured as bosses in Turtles In Time.
- Continuity Cameos: Their appearance in Turtles Forever
- Dual Boss: They were fought as a pair in Turtles in Time.
- Dumb Muscle: In Secret of the Ooze, they would have been cunning villains, had Professor Perry not tainted the ooze.
- Elemental Powers: In Turtles in Time Tokka has ice powers and Rahzar has fire powers.
- Evil Knockoff: Tokka.
- Expies: Of Bebop and Rocksteady. In fact, they were created specifically for the second live-action movie because Eastman and Laird did not want Bebop and Rocksteady in it.
- Man Children: "They're BABIIEES!"
Splinter's owner, a martial artist whose fate at the hands of The Shredder gets the ball rolling. Sometimes he and Splinter are one and the same.
Appears in: All incarnations except the 2014 movie.
- Adapted Out: He does not exist in the 2014 film.
- Animorphism: His origin in the Fred Wolf cartoon, the Archie Comics, and the Nickelodeon cartoon.
- Ascended Extra: The 4Kids cartoon and incarnations where he is also Splinter.
- Composite Character: He and Splinter are one and the same in several incarnations, namely, the Fred Wolf cartoon, the Archie comics, and the Nick cartoon.
- Death by Origin Story: Incarnations where he is not Splinter, the IDW comics.
- "Facing the Bullets" One-Liner: "He who lives without honor, will end without honor." (4Kids cartoon)
- Metamorphosis: To a rat, in the Fred Wolf cartoon and Archie comics.
- Opposites Attract Revenge: Yoshi's love triangle with Oroku Nagi over Tang Shen would help to set up a Cycle of Revenge.
- Plot-Triggering Death: In continuities where he isn't Splinter, it's his death that serves as the main catalyst for the feud between the Turtles and the Foot.
- Posthumous Character: In most continuities safe for the Fred Wolf animated series, the Archie Comics, and the Nickelodeon animated series.
- Reincarnation: In the IDW Comics, Splinter believes that he is the reincarnation of Yoshi.
- Spared by the Adaptation: The Fred Wolf cartoon, the Archie Comics series, and the Nickelodeon cartoon, since in those versions, he became Splinter.
- Technical Pacifist: In the IDW Comics.
Yoshi's lover, who is murdered as part of his backstory.
Appears in: Mirage comics, films, 4Kids cartoon, IDW Comics, Nick cartoon.
- Death by Origin Story: She's killed as part of Hamato Yoshi's backstory.
- Happily Married: Implied in the Nick cartoon to Yoshi, before her death.
- Love Triangle: Is the object of affection for two suitors in nearly every adaptation. One of the suitors is Hamato Yoshi, and the other suitor is primarily Oroku Saki (though in the Mirage comics it was Saki's brother Nagi, and in the 2003 cartoon it was an entirely different character named Yukio Mashimi, who grew up alongside Yoshi and Tang Shen). She always chooses Yoshi, and the other suitor gets jealous. While there are variations in the story for what happens after that point, the one consistency is that Tang Shen always ends up dead by the end.
- Missing Mom: As far as is known, she is the only member of the Hamato family to not have been reincarnated in the IDW Comics.
- Plot-Triggering Death: In continuities where Yoshi survives as Splinter, her death is often the catalyst for the Turtles' feud with the Foot.
- Posthumous Character: She's usually dead by the time the various series start.
- Stuffed into the Fridge: Her only purpose in the narrative is to get killed.
- Yamato Nadeshiko: Most notable in the 4Kids cartoon, where she's allowed to have lines and a semblance of a personality, but she is presumably one in other continuities as well.
Michelangelo's pet cat, originally a stray that Mike found and adopted one Christmas.
Appears in: Mirage comics, Image comics, 4Kids cartoon.
- Gender Flip: Possibly. Is male in the Mirage comic, and is referred to as male when first appearing in the 2003 cartoon — though in redesigns for the Back To The Sewers looks more female, and was even referred to as a "she" on the 4Kids website.
- Killed Off for Real: Mirage continuity.
- Someone to Remember Him By: After his death, Mikey adopts one of the kittens Klunk fathered.
- Spared by the Adaptation: He doesn't die in the 2003 cartoon.]]
- Team Pet: Curiously enough, subverted. He's a completely normal cat who never gets involved in the stories and whose appearances are generally spent lying around on the floor or in someone's lap.
- What Happened to the Mouse?: When Shredder attacks April's apartment in issue 10, Klunk is nowhere to be seen, and isn't even mentioned when April, Casey and the Turtles escape. (This is doubly frustrating because he was explicitly shown to be in the apartment in the Leonardo special, which takes place immediately before.) He remains unmentioned for several issues before he shows up on Casey's farm with no explanation at all.
Wingnut and Screwloose
An alien bat and mosquito duo from the planet Huanu
Appears in: Archie comics, Fred Wolf cartoon, Nick cartoon (Wingnut only)
- Bat out of Hell: In the Fred Wolf cartoon Wingnut is an alien bat.