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The Foot Clan
A young scientist who becomes the head of the Foot's science department in season 3.
- Amazon Chaser: A look at his Amazon Blade Bots makes it clear that a large part of his crush on Karai rests on her ability to kick ass.
- Improbable Age: Although the art style makes it somewhat hard to determine just how old he is, the various comments made about it suggest that he is either a teen or barely in his twenties when he debuts, which makes him a rather young for a doctor and way too young for a department head.
- Punch Clock Villain
A highly skilled Foot Ninja who tries to bring the Clan back to its former glory in season 7, and who becomes Cyber Shredder's agent in the real world.
- Animal Motif: The dragon—fitting, since he's also The Dragon
- Convenient Replacement Character: Essentially only introduced in Back to the Sewers to replace Karai as the acting leader of the Foot, since it's heavily implied that she left with Chaplin after the season 5 finale
- The Dragon
- Evil Mentor: He is first seen running a martial arts school, whose students include Casey.
- Flat Character: He doesn't serve much purpose besides being the Shredder's right-hand man.
Superheroes and supervillains
One of Michelangelo's superhero idols and the leader of the modern-day Justice Force.
- Captain Ersatz: Of Superman.
- Chest Insignia: A stylized bird—probably.
- Flying Brick
- Super Toughness
- Xray Vision
A hydrokinetic super-hero from Japan who joins the Justice Force in season 3.
An psychokinetic super-hero from India who joins the Justice Force in season 3.
A sentient nanomachine colony who escapes its creators and causes trouble.
- Anti-Villain: It either has the mindset of a child or is being controlled by outside forces; either way, it is rarely entirely responsible for its actions.
- Crush. Kill. Destroy!
- Heel–Face Turn: In season 5.
- I Just Want to Be Loved: It views itself as a child who wants to be loved by its "mother", the doctor who created it, and its "father", Harry the con artist.
- Instant A.I., Just Add Water: For unexplained reason, the nano-machine colony started personifying, to its creator's chagrin.
- Nano Machines
- Obliviously Evil
- Tragic Villain: Sure, it caused destruction almost everywhere it went, but its supposed death scenes are rather disheartening.
Green Lantern if Green Lantern got his powers from a cape.
- Captain Ersatz: Of Green Lantern, specifically Hal Jordan.
- Clothes Make the Superman
- Lantern Jaw of Justice
Turtle Titan II
A man who takes on Michelangelo's old super-heroic identity.
- Animal-Themed Superbeing
- Identical Grandson: Of Silver Sentry.
- Jetpack: How he flies.
- Legacy Character: A twofer, continuing the legacies of both Michelangelo and Silver Sentry.
Silver Sentry's arch-enemy, who uses his engineering prowess to commit super-crime.
- Dr. Genericius
- Hypno Trinkets: The mind-control bugs he uses in his debut activity.
- Mad Scientist
- Morally Ambiguous Doctorate
- The Bus Came Back: He made just one appearance in the first season during Michelangelo's teamup episode with Silver Sentry and remains absent for the remainder of the series(aside from appearing in a story told by Michelangelo during Fast Forward) until the seventh and final season where he makes one more official appearance.
The Battle Nexus
The Ultimate Ninja
A warrior who comes to Earth to challenge Leo to mortal combat.
- Antagonistic Offspring
- Artificial Limbs: Specifically, his left hand.
- Fusion Dance: With Drako during the third season.
- Meaningful Rename: “The Ultimate Ninja” is what he calls himself after he believe he's defeated Leonardo.
- Sore Loser: Attempts to kill Leonardo after being officially defeated.
- Taken for Granite / Literally Shattered Lives
- Raise Him Right This Time: After he is killed Lord Simultaneous revives him as a child. It's implied the Daimyo will do this.
- The Unfavorite
- Walking Armory: Swords, Wolverine Claws, chain and sickle, shuriken, blinding dust—the works.
Ruler of the Battle Nexus and The Ultimate Ninja's father.
- Everyone Calls Him "Barkeep"
- The Good King
- Long Lived
- Old Master
- Sanity Slippage: In the third season, it is clear he has not taken the loss of his son very well.
A Battle Nexus Championship contestant who was defeated by Splinter years ago.
- A Dog Named "Dog"
- Killed Off for Real
- Sore Loser: Attempts to have Splinter killed after having lost the Battle Nexus Tournament.
- Taken for Granite / Literally Shattered Lives
A Battle Nexus Championship contestant with an animus towards Michelangelo.
- Ambiguously Evil: While he eventually tries to kill Michelangelo for purely selfish reasons, he also formed part of Traximus' rebel army, which makes it rather hard to get a sense of him.
- Sdrawkcab Name: The character is meant to be a homage to The Hulk.
- Sore Loser: Although he has a point about only losing on a technicality, it eventually becomes clear that he doesn't really give a damn about the Battle Nexus Championship or its rules.
- Super Mode: Inverted, more or less, as he spends way more time in his hulked-out form than he does in his smaller state.
The Ninja Tribunal Arc
The Ancient One
Hamato Yoshi's adoptive parent and, for a time, Leonardo's sensei.
- Back for the Finale: He's one of the guests at Casey and April's wedding and takes part in the ensuing battle against the Cyber Shredder.
- Big Good: Shares the role with Splinter in the fifth season after the apparent deaths of the Tribunal.
- Gass Hole: Early on, he teaches Leo a lesson on how he can't win all his battles by getting him pit against some near invincible warriors. How did the Ancient One put through Leonardo through this lesson? By farting and alerting said warriors to their presence.
- My Greatest Failure: He blames himself for not doing anything about the darkness in Mashimi's heart before his murder of Tang Shen.
- No Name Given
- Obfuscating Stupidity: Once Leonardo learns of his true nature, he drops the crazy mentor facade, though he remains fairly whimsical until the fifth season.
- Old Master
- Reasonable Authority Figure: Leonardo and Michelangelo even wish they could be studying under him over the rough Tribunal.
- Trickster Mentor: At first.
The Ninja Tribunal
A quartet of long-lived ninja masters who have made it their lives mission to stop the Demon Shredder. Their names are Kon, Juto, Chikara, and Hisomi.
- Amazonian Beauty : Chikara. Adam certainly thinks so.
- Big Good
- The Chessmasters
- Color-Coded Characters: Hisomi is yellow/gold. Chikara is green. Juto is blue. Kon is white.
- Disney Death: They are only revealed to have survived in the ending of the season finale.
- Good Is Not Nice
- Meaningful Name: Chikara's name is the Japanese word for "Power". Her specialty is physical strength.
- Physical Gods
- The Omniscient Council of Vagueness: Initially, anyway.
- The Smurfette Principle: Chikara is the only female member.
- Sacrificial Lions
- What the Hell, Hero?: This is how Splinter (and the audience) react when the Ninja Tribunal refused to do anything about the Utrom Shredder, even allowing him to kill Master Yoshi. Justified when it's revealed that without Yoshi's death, Splinter and the turtles wouldn't have been mutated, something Don lampshaded 3 seasons ago in the Clip Show episode.
Four martial artists who were kidnapped along with the turtles to serve as the Ninja Tribunal's apprentices. Their names are Faraji Ngala, Joi Reynard, Adam McKay, and Tora Yoshida
- Back for the Finale: They're guests at Casey and April's wedding, and fight against the Cyber Shredder.
- Overshadowed by Awesome:
- Sacrificial Lions: They eventually come back, but their “deaths” serve this purpose.
- Satellite Characters: Each acolyte establishes a rapport with a particular turtle, whom they revolve around—Faraji befriends Leo, Joi bonds with Raph, etc.
The Shredder's Heralds / Foot Mystics
The Demon's Shredders, who had been forced to serve the Utrom Shredder until they engineered their freedom.
- Ascended Extra: They were one-off villains for the penultimate arc of the first season, and voiceless. They return early in the fourth season, and nearly mentally break the Turtles, discover the location of their lair, and facilitate a plot that leads to the return of the Tengu Shredder, becoming the BigBad's for the first half of the fifth season before returning to their role as his Dragons.
- Big Bad: For the first half of the fifth season.
- Because You Were Nice to Me: A non-romantic example; though they deem Ch'Rell an "Utrom abomination", they appreciated his large amount of respect for their powers when they served him, in comparison to his daughter, who cares less what they think.
- Elemental Powers
- The Dragons: For the demon Shredder
- Revenge Before Reason: Despite their loyalty to the demon Shredder, they are obsessed with getting revenge on Karai. They question him why he isn't concern to punish Karai for using his name, he tells them he's cares more about ruling the world. Though they don't wish to deter their master with his plans, this does not sit well with them. They also fume over the Shredder's lack of action when the Turtles and their allies attack their fortress.
- Voluntary Shapeshifting
- You Have Outlived Your Usefulness: Demon Shredder let them get killed.
Casey and April's great-grandson and heir to both O'Neil Tech and the Jones fortune.
- Ascended Fanboy: Grew up reading April and Casey's journals about the turtles. The entire Fast Forward season started because he made a device to watch their adventures through time and accidentally yanked them into the future.
- The Cameo: He briefly appears in the finale, watching the wedding of his great-grandparents through the Time Window.
- Conveniently an Orphan: Both of his parents are dead and his only relative is his Obviously Evil Uncle.
- Gadgeteer Genius: Invented Time Travel. By accident.
- Lonely Rich Kid: The only people in his life before the Turtles and Splinter came to the future were his robot butler and Evil Uncle, so he's thrilled to have his personal heroes crash at his penthouse.
- Non-Idle Rich: To Serling's dismay.
- Significant Green-Eyed Redhead: Well, obviously since he's April and Casey's future great-grandson.
- Tagalong Kid
- Teen Genius
Cody's robotic caretaker, who only barely tolerates the turtles.
- Arm Cannon: As Turtle X Mark II
- Backto Back Badasses: With Splinter in "Bad Blood".
- Battle Butler: He was no slouch in fighting beforehand, but becomes the new Turtle X armor late into the sixth season.
- Berserk Button: Messing with Cody. Dun learned this the hard way.
- Disney Death: See Heroic Sacrifice.
- Fish Out of Temporal Water: In the seventh season. He ends up being sent back into the 21st century by Viral, and doesn't entirely enjoy the experience, though Word of God says he ended up thinking his stay was worth it when he got to witness the wedding of Casey and April.
- Heroic Sacrifice: Pulls one in "Turtle X-Tinction".
- Mini-Mecha: As Turtle X Mark II
- Robot Butler
- Transforming Mecha: As Turtle X Mark II
- True Companions: He may dislike the Turtles, but he gets along very well with Master Splinter, and later Donatello.
- What Happened to the Mouse?: At the end of the series, he's still in the present day, but is nowhere to be seen in Turtles Forever. Though it's likely he's returned to his own time.
Cody's uncle and legal guardian, he uses his position as the C.E.O. of O'Neil Tech to facilitate various shady dealings.
- Berserk Button: Cody says he hates being called "fatty."
- Big Bad
- Corrupt Corporate Executive
- Evil Uncle
- Fat Bastard
- High-Class Glass
- Illegal Guardian
- Knight of Cerebus: By virtue of being Cody's Evil Uncle, he has a far more personal effect on the heroes when he finally does get outed and nearly kills Cody and Serling.
- Manipulative Bastard
- Spell My Name with an "S"
- Villain with Good Publicity: He starts out this way at the beginning of his arc.
- What Happened to the Mouse?: Thanks to the Aborted Arc of the Fast Forward season, his final fate was never revealed. But it's likely he was defeated and arrested offscreen.
- You Monster!: Splinter is repulsed by him.Splinter: I have met many monsters in my time, Dunn, but it takes a special breed to direct such bile and hatred against a child!
An alien invader who has determined that Earth is the ideal planet for him to spread his gene-seed.
- Arc Villain
- Back for the Finale: After his own Time Window goes haywire, he disappears until the penultimate (though for all effects the final) episode of Fast Forward.
- Big Bad Ensemble: With Darius Dun.
- Big Bad Duumvirate: He later forms one with Darius Dun for the first half of Fast Forward.
- Expy: He shows more than a few similarities to Lord Dregg.
- Karma Houdini: He tricked Torbin Zixx into smuggling a bomb onto a spacecraft and while Zixx did rat him out to the turtles, who in turn reported it to Bishop, Sh'Okanabo never got in trouble for almost hurting many innocent beings.
- Knight of Cerebus: Episodes that feature him as the main antagonist are far more serious with larger ramifications.
- Killed Off for Real
- Light Is Good/Dark Is Evil: He looks dark and works in the shadows, is never seen walking around in daylight, if weak enough, sunlight can hurt him and he was killed by a solar grenade.
- Spikes of Villainy
- The Virus: Anyone infected with his gene seeds becomes a Kanabo drone subservient to him.
- Voluntary Shapeshifting
Constable Aloysius Biggles
A robot who serves as an officer of the New New York Peacekeepers and who keeps running into the turtles.
- British Copper: In intent if not in reality.
- Butt Monkey: To the point that the main gag of a preview of an episode revolved around his really long fall from a skyscraper, and Michelangelo finally admits at the end of the promo that someone should probably save him. Funnily enough, in the episode proper this is not played for laughs.
- Catchphrase: “'Allo 'Allo 'Allo. Wot's all this then?”
- Inspector Javert: Occasionally, most notably in “Playtime's Over”
- Ridiculously Human Robot: Despite being presumably programmed for the job, he rather dislikes the paperwork it involves.
An A.I. who serves under Sh'Okanabo.
- Cyber Cyclops: In her corporeal form, anyway.
- The Dragon: Was Sh'Okanabo's lieutenant during his arc.
- Digitized Hacker
- Fish Out of Temporal Water: She gets stuck in the twenty-first century at the beginning of season 7.
- Shapeshifter Weapon: Her corporeal form is based on a shape-shifting training bot, whose limbs can turn into things like chainsaws.
An O'Neil Tech intern and friend of Cody Jones.
- Blue-Skinned Space Babe: Complete with a True Blue Femininity appearance.
- Full Name Ultimatum: Pulls one on Cody Augustus Jones when pretending to be mad over him ditching her in the mall.
- Interspecies Romance: Clearly wants this with Cody as "Playtime's Over" revealed, and soon enough it seems they are dating.
- Rollerblade Good
- Rubber-Forehead Alien: Pointy ears, blue skin, and large eyes differentiate her from standard humans.
- Teen Genius
A cyborg who runs the Street Phantoms, a New York gang.
- Compressed Hair: His hair is completely obscured by his hood despite the fact that it's several feet high.
- Intangible Man: Like all members of the Street Phantoms, thanks to their phasing tachnology.
- Slasher Smile
- Smarter Than You Look
The Inuwashi Gunjin
A quartet of winged humanoids who serve as Darius Dun's reluctant enforcers.
- Anti-Villains: They work for Darius Dun only because they have been implanted with electronic machines that Dun uses to torture and contain them. They kidnap Cody and threaten to kill him if Dun (who needs Cody alive) won't free them. They note the turtles' honor for repeatedly saving Cody who's little help to them (at the time). They finally decide to follow the turtles' example of honorability and give them time to escape from drowning.
- Forced into Evil
- Heel–Face Turn: They all pull one once they are finally freed from Dun's control.
- Last of Their Kind
- Proud Warrior Race Guys: Their race was once the most feared force of earth and sky.
- Winged Humanoids
- Worthy Opponents: As they witness the turtles saving multiple times Cody who's not much of a help in a fight, they remark that to be truly honorable.
The Dark Turtles
Created by Sh'Okanabo from the turtles' genetic material, these four mutant turtles serve Darius Dun. They are all voiced by the same actors for the original turtles.
- Big Brother Instinct: Kind of a grey area. Towards the end of "DNA Is Thicker Than Blood", Dark Leo divides up the meat among his brothers. This action is so unexpected that it sparks confusion among them.
- Color-Coded Characters: The color of each turtles' skin more or less corresponds to their counterparts' bandanna colors.
- Dark Is Evil: At first. They were more than eager to try destroying their original counterparts.
- Dark Is Not Evil: They have the capacity to be better if they were given the chance.
- Dumb Muscle: Dark Raph. He was so stupid that he couldn't pick up Mikey's sarcasm.
- Evil Twins
- Forced into Evil: While it doesn't occur in the same way as with their predecessors the Gunjin, the episode “D.N.A. is Thicker Than Water” implies that they have the capacity to be better turtles if it weren't for the fact that they are forced to work for Dun.
- Geek Physiques: Dark Don is the tallest and skinniest of the quartet.
- I'm a Humanitarian:Dark Raph: Let's crack your shell open and see if there's a yummy cream filling inside!
- Laughing Mad: All of them, primarily Dark Mikey.
- Oddball Doppelgangers
- Off with His Head!: In their first 2 appearances, Dark Leo threatened to cut off someone's head.Dark Leo: *holding his sword next to Cody's neck* No sudden moves, or your friend here loses his head.Leonardo: How long have you been working for Dun?Dark Leo: Details, details, you should be paying attention to more immediate matters, like keeping your head on!
- Psycho Rangers
- Reptiles Are Abhorrent
- Slasher Smile / Psychotic Smirk: They at least show off one.
A famed mercenary who has several run-ins with the turtles.
- Advertised Extra: He appears in the opening titles, despite his sporadic appearances in the series.
- Combat Pragmatist
- Con Man
- Even Evil Has Standards: Deliver/smuggle an illegal package for an alien? Sure. Said package turns out to be a bomb that could've potentially hurt many innocent humans and aliens? Yeah, big mistake.
- Heroic Sacrifice: Volunteers to make one in the final episode of Fast Forward to save Earth from a dark matter asteroid. It's actually his ship, which he escaped to with a device that had been jury-rigged to destroy the asteroid.
- Wild Card / Chaotic Neutral
A pro-wrestler turned criminal who sports three heads, each with its own personality.
A government agent who will do absolutely anything to protect Earth from aliens invasion. Head of the Earth Protection Force.
- Alien Blood: Despite being human.
- Ambiguously Human: He was definitely human at some point, but after a certain event some 200 years ago, it's no longer clear what he is.
- Anti-Villain: He genuinely tries to protect humanity from potential alien invaders. The problem is, he is sadistic, amoral, suffers a huge case of Fantastic Racism against aliens and mutants as a whole, and conducts horrible experiments o reach his goals.
- The Atoner: In Fast Forward.
- Badass Longcoat: Part of his signature look.
- Back for the Finale: After being absent for the entirety of the final season, he makes a cameo watching April and Casey's wedding with approval.
- Benevolent Boss: He can be stern or angry toward Stockman, but for the most part, he shows genuine concern for his condition (if just because he still needs Baxter's knowledge) and, unlike the Shredder, never threaten to kill or mutilate him for his failure.
- Big Bad Ensemble: He's the most prominent antagonist in the third season not aligned with the Foot. After the final defeat of Ch'Rell, in the fourth season, he forms an ensemble with Hun and Karai, with Stockman as his Dragon.
- Canon Immigrant: A character who talks while off-panel in one issue of the Mirage Comics has been confirmed by Word of God to be him.
- Clone Degeneration: He survived so long by regularly cloning himself in a new body that ends up degenerating after a while, forcing him to do it over and over again.
- Combat Pragmatist: He ends up using his own tie to fight the Turtles, Karai and Hun and still continues to kick ass.
- Dark Is Evil: As a villain, his suit is black.
- Enemy Mine: Twice:
- When the mutagen he used to create a fake alien invasion ends up unleashing mutants on New York, he teams up with the Turtles and Leatherhead to end it.
- In the fifth season, he is amongst the many villains who join force with the Turtles to stop Tengu Shredder.
- The Extremist Was Right: In "Aliens Among Us".
- Four Eyes, Zero Soul: He's never seen without a pair of sunglasses, and he's a bad guy.
- Freudian Excuse: In the 1800s, Bishop was a soldier in the Civil War who was abducted by aliens, being experimented on and genetically altered, turning him into the xenophobic Well-Intentioned Extremist he is in modern times who's willing to cross any moral boundary in order to keep Earth safe from alien incursions. Given his past, it's quite understandable why he became the man he is today, though in no way does this justify all the lives he's ruined and the people he's hurt.
- Heel–Face Turn: In Fast Forward
- Karma Houdini: Though he at least learnt from his mistakes and tries to atone for what he did.
- Light Is Good: In Fast Forward where he's become good, his suit is white.
- One-Man Army: He can hold his own against all four of the turtles, AND Karai and Hun all at the same time. He's also seen effortlessly fending off the Foot Elite in Exodus.
- Promotion to Opening Titles: From the fourth season to the sixth season.
- Really 700 Years Old: He's somewhere around 220.
- Sinister Shades: In his battle outfit, and in Fast Forward.
- Supporting Leader: When the Turtles and Karai are fighting the Demon Shredder, Bishop takes command of the Purple Dragons AND the Justice Force along with his own men.
- Unwitting Pawn: In "Good Genes", he is promised an alien artifact of great power by an unknown entity, and has the Turtles retrieve it for him. When he gets it, he ends up destroying it, which frees the Foot Mystics from Karai's control, leading to the return of the Demon Shredder.
- Well-Intentioned Extremist: In the present.