Characters created for, and exclusive to, the 2003 4Kids-produced TMNT cartoon. For tropes relating to characters who originally appeared in other incarnations or were created here and went on to appear elsewhere, please visit the franchise character page. Note: All the characters here are canon foreigners, so noting that for every individual character is unnecessary.
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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 first debuts, which makes him a rather young for a doctor and way too young for a department head.
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
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.
Obfuscating Stupidity: Once Leonardo learns of his true nature, he drops the crazy mentor facade, though he remains fairly whimsical until the fifth season.
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.
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.
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.
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.
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.
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.
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.
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 series with larger ramifications.
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.
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.
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.
Anti-Villain: Type III. 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.
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.
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.
Villainous Crush: He spends half of "Hun on the Run" kicking ass, the other half admiring Shredder's lovely daughter and keeping her close.