Characters: Teenage Mutant Ninja Turtles
Characters from the long-running comic book series Teenage Mutant Ninja Turtles
, as well as some exclusive to some of its non-comic incarnations. 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 1987Teenage Mutant Ninja Turtles 2003Teenage Mutant Ninja Turtles (2012)FilmsThe Live Action TrilogyTMNTTeenage Mutant Ninja Turtles (2014)Live Action TVNinja Turtles: The Next Mutation
open/close all folders
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.
- Brown Eyes: In the movies, original cartoon and Next Mutation.
- Competitive Balance:
- 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.
- Foil: all four of them as a group and in pairs
- 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.
- Four Philosophy Ensemble: Raph is Cynical, Mike is Optimist (no wonder both take shots at each other), Leo is Realistic and Don is Apathetic (with traces of Conflicted).
- Green Eyes: In the 2003 cartoon.
- Happily Adopted
- 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.
- The Team/Color-Coded Characters
- 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.
- 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.
- 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
- Emotions vs. Stoicism
- The Face
- Four-Temperament Ensemble: Melancholic.
- 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 BSOD: Mirage Comics, 4Kids Series.
- Heroic Spirit: A big reason why he's a determinator.
- Heterosexual Life-Partners: With Miyamoto Usagi.
- Honor Before Reason
- 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.
- Jack of All Stats: Videogames.
- 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
- Martial Pacifist: Mirage Leonardo, in the future.
- Master Swordsman
- 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.
- Red Oni, Blue Oni: The blue to Raphael's red, of course!
- 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 Versus 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.
- Team Dad
- Thou Shalt Not Kill: Mirage Leonardo, in the future.
- Took a Level in Jerkass: During the first half of the 4Kids cartoon's fourth season, combined with Heroic BSOD. 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 Adorable
- Badass Bookworm
- 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.
- Beware the Nice/Quiet Ones
- 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.
- Also an example of It's a Wonderful Plot, where a character often sees that their team or the whole world is worse off for their absence.
- Big Little Brother: Taller than Leo but, fittingly, tied with Raph.
- 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.
- 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.
- Foolish Sibling, Responsible Sibling: The responsible to Michelangelo's foolish.
- Four-Temperament Ensemble: Phlegmatic.
- 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
- Genius Sweet Tooth: Averted he doesn't seem to have much of a Sweet Tooth and according to his official profile his favorite food is sushi. Although in one issue of the comic comic written by Matt Howarth Donny's Acid Reflux Nightmare Is triggered by eating an entire bag of cookies.
- 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 BSOD: 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 has the most health and the longest reach.
- Mr. Fixit
- Named After Somebody Famous: Donato "Donatello" di Niccoló di Betto Bardi.
- Nice Guy
- 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 Rapheal in line. By the end after Raph got his head on straight, he took over leadership from Don.
- Omnidisciplinary Scientist
- OOC 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.
- 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.
- The Professor
- The Reliable One
- The Smart Guy
- Sesquipedalian Loquaciousness: For example: "The elasticity of its flesh is too resilient!" note
- Technical Pacifist: In some incarnations.
- Teen Genius
- 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: 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 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.
- Bash Brothers: With Casey.
- Berserk Button: Threaten his family and you're gone.
- 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 and even Leonardo.
- Big Brother Instinct: Again, towards Michelangelo, especially in the comics.
- The Big Guy
- 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.
- 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 Friend: With Casey, in most incarnations.
- Four-Temperament Ensemble: Choleric.
- 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.
- Good Is Not Nice
- 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.
- The Lancer
- 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.
- Medium Awareness / No Fourth Wall: Fred Wolf series.
- 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.
- 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 Oni, Blue Oni: The red to Leonardo's blue.
- Secret Identity: Nightwatcher, in the fourth movie.
- 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.
- Wolverine Publicity
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).
- 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.
- Beware the Nice/Silly Ones
- 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.
- 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.
- 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 series.
- Foolish Sibling, Responsible Sibling: The foolish to Donatello's responsible.
- Four-Temperament Ensemble: Sanguine.
- Fun Personified
- Genre Savvy: 4Kids series.
- 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.
- Hidden Depths
- 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.
- Jumped at the Call: 4Kids series.
- Kid-Appeal Character
- Kindhearted Cat Lover
- The Knight Who Says Squee: 4Kids cartoon.
- Large Ham: In almost every incarnation.
- Lightning Bruiser: 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 (Turtles in Time, The Arcade game, Manhattan Project).
- Named After Somebody Famous: Michelangelo di Lodovico Buonarroti Simoni.
- Plucky Comic Relief
- 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).
- The Slacker: 4Kids series.
- 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)
- 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.
- 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 new show.
- Weapon of Choice: Fighting with Chucks (the hardest to master of the four turtles' weapons).
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.
A girl next door
who serves as one of the turtles' first human friends. Normally associated with the color yellow.
Appears in: Most incarnations.
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).
- Bash Brothers: With Raph.
- Batter Up
- The Berserker: Initially.
- 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.
- Boisterous Bruiser
- Brooklyn Rage
- Catchphrase / Battle Cry: "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.
- The Faceless: Fred Wolf cartoon.
- Fire-Forged Friend: 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
- Leitmotif: 4Kids cartoon.
- 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.
- Overshadowed by Awesome: 4Kids cartoon.
- Vigilante Man
- You Gotta Have Blue Hair: 4Kids cartoon.
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.
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, IDW Comics.
An apprentice "Timestress" whose job it is to oversee and protect the timestream.
Appears in: Mirage comics, 4Kids cartoon
- 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 skintight (and sometimes rather revealing) 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.
- Shout-Out: The third movie prominently features a time travel scepter that looks very similar to Renet's.
- Time Police
- 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.
A skateborading gecko who is friends with Michaelangelo
Appears in: Fred Wolf Cartoon, Archie Comics
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.
- Adaptational Villainy: The 4Kids version is far more malicious than any other versions (Although Movie Shredder comes close).
- Ascended Extra / Breakout Villain: In the very first comic, he perishes. In all other media (save Next Mutation, the third and fourth movies, and the final two seasons of the Fred Wolf show), he's the main nasty.
- 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: Depending exactly how much according to the incarnation, but he usually is at least able to handle all the Turtles of his own in a fight.
- Adaptational Badass: The movie, 4Kids and Nickelodeon versions are far more capable and dangerous than the Mirage or Fred Wolf versions of the character.
- Badass Normal: With the exception of both of the 4Kids Shredders, all versions of the Shredder are perfectly normal humans, yet remarkable fighters.
- Bad Boss
- Big Bad
- Big Bad Duumvirate: With Krang in the Fred Wolf cartoon.
- Big Bad Ensemble: So far sharing this with the Kraangs in Nickelodeon version, as both of them have served as the main reacurring threats and both playing a part in the turtles' origin.
- 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.
- Blade Below the Shoulder: His trademark weapon.
- Catch Phrase: 4Kids cartoon: "None of you will leave here/this place alive!"
- 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 hybrid of his usual self and Krang.
- Corrupt Corporate Executive: 4Kids cartoon.
- Briefly in the Fred Wolf cartoon, as chairman of Octopus Inc.
- Darth Vader Clone
- Dead Person Impersonation: Ch'rell, in the 4Kids version. Oroku Saki later turns out to be more alive than expected.
- 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 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 Hammy
- Evil Laugh
- 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
- 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.
- Genre Savvy: 4Kids cartoon. Doesn't automatically assume the turtles are dead when Never Found the Body occurs, unless he has definitive proof of it. Refuses to believe a robot masquerading as Splinter will fool anyone for a second. Will put aside his personal grudge for the turtles to work alternate angles in his schemes from time to time, unless they REALLY irritate him. What prevents him from being Dangerously Genre Savvy is that he fails to recognize that both his daughter's increasing conflicting loyalties and pulling a You Have Failed Me on minions, (the same minions mind you), will eventually come back to bite you in the ass. Lastly, as Leonardo put it; "The one constant in the multiverse is the Shredder's big fat ego."
- Healing Factor: 4Kids cartoon.
- 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.
- 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)
- 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.
- Laughably Evil: Fred Wolf cartoon.
- 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.
- Leitmotif: 4Kids cartoon.
- Mobile-Suit Human: 4Kids cartoon.
- Mind over Matter: 4Kids cartoon.
- 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 rhe 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 millenium.
- Not Quite Dead: 4Kids cartoon.
- 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 Nickolodeon 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).
- Red Eyes, Take Warning: 4Kids cartoon.
- 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.
- Secret Identity
- Shoulders of Doom
- 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.
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 animated film, Nick cartoon.
- Action Girl: Can usually take any one of the turtles head to head, though not all four like Shredder frequently can.
- Ambiguously Evil: How ambiguously exactly varies with the versions, but she typically is this in all versions.
- Anime Hair: The Nickeldeon version; she has black hair in the front and blonde hair in the back.
- Anti-Villainess: 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.
- 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.
- Daddy's Little Villain: In the 4Kids 'toon and Nickelodeon show, she actually is the Shredder's foster daughter.
- 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?
- Dragon Ascendant: 4Kids cartoon.
- Enigmatic Minion: 4Kids cartoon, 2007 movie.
- Foil: A Shadow Archetype to Leonardo.
- Heel-Face Turn: 4Kids cartoon, though it doesn't happens until season 5.
- Honor Before Reason
- 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.
- Lady of War
- Leitmotif: 4Kids cartoon.
- Luke, I Am Your Father: In the Nick cartoon, she finds her biological father is Hamato Yoshi aka Splinter.
- My Master, Right or Wrong: 4Kids cartoon.
- Red Eyes, Take Warning: 4Kids cartoon.
- Secret Identity
- 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.
- 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 included) to make her leave him once and for all.
- The Vamp: In the Nickeldeon Cartoon, she has shades of this toward Leo.
- Villainess with Good Publicity: 4Kids cartoon.
- Wild Card
- Woman Behind the Man: In the Mirage Comics version she's this to the Shredder due to being the leader of the Foot.
- 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.
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 talking head 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 cartoon isn't exactly pretty, either.
- Butt Monkey: Gradually in both the Fred Wolf and 4Kids cartoons. The Nickelodeon cartoon does this right off the bat.
- Brain in a Jar: Mirage comics, 4Kids cartoon.
- Break the Haughty: 4kids version: Pretty much his entire career is this, but "Insane In The Membrane" is where it really sinks in.
- Clone Degeneration: 4Kids cartoon.
- 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.
- 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
- 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.
- 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.
- Leitmotif: 4Kids cartoon.
- Mad Scientist
- Metamorphosis: From human to giant fly, in the Fred Wolf cartoon.
- 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: Fred Wolf cartoon.
- Sanity Slippage: In every version, he grows more and more unstable after his transformation. Best demonstrated in "Insane In The Membrane".
- Scars Are Forever: 4Kids cartoon.
- 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").
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.
- 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".
- Bandaged Face
- Beast Man: Mirage Comics, 4Kids series.
- The Beastmaster
- Clone Degeneration: 4Kids series.
- Cyborg: 4Kids series.
- Dead All Along: During the "City at War" arc (Mirage series).
- Depending on the Artist
- 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.
- 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).
- Super Strength
- 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.
- Adaptational Badass: While still idiots, the IDW incarnations of Bebop and Rocksteady are noticeably far more dangerous than their 1987 cartoon counterparts.
- 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.
- Blondes Are Evil/Bald of Evil: Rocksteady had blonde hair in his human form, but he inexplicably went bald after he mutated into a rhino.
- Canon Foreigners
- 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
- 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.
- Harmless Villain
- Laughably Evil
- 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
- Pig Man: Bebop.
- Put on a Bus: Fred Wolf series, Archie comics.
- The Quincy Punk
- 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
- 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
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.
- Animorphism: To a mutant turtle, in Turtles Forever.
- The Brute
- Canon Immigrant: Created for the 4Kids show, adapted back into the 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: Eventually becoming Co Dragon alongside Karai.
- Karmic Transformation
- Large and in Charge
- Lightning Bruiser: Don't let his size fool you, Hun is astonishingly fast—more than fast enough to be a match for the turtles.
- Most Gamers Are Male: Size doesn't seem to matter for him.
- Tattooed Crook: In the 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.
- Ultimate Gamer 386
- 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 / Laser-Guided Tykebomb: In the IDW comics, Slash was specifically created to track down the turtles.
- Heel-Face Turn: In the Archie comics, 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).
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.
- 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.
- 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.
- 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
- 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 (IDW Comics): As far as is known, she is the only member of the Hamato family to not have been reincarnated.
- Posthumous Character
- 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.
- 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 Cat?: 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)