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.
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.
Superheroes and supervillains
One of Michelangelo's superhero idols and the leader of the modern-day Justice Force.
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.
Green Lantern if Green Lantern got his powers from a cape.
Turtle Titan II
A man who takes on Michelangelo's old super-heroic identity.
Silver Sentry's arch-enemy, who uses his engineering prowess to commit super-crime.
The Battle Nexus
The Ultimate Ninja
A warrior who comes to Earth to challenge Leo to mortal combat.
Ruler of the Battle Nexus and The Ultimate Ninja's father.
A Battle Nexus Championship contestant who was defeated by Splinter years ago.
A Battle Nexus Championship contestant with an animus towards Michelangelo.
The Ninja Tribunal Arc
The Ancient One
Hamato Yoshi's adoptive parent and, for a time, Leonardo's sensei.
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.
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 Mc Kay, and Tora Yoshida
The Shredder's Heralds / Foot Mystics
The Demon's Shredders, who had been forced to serve the Utrom Shredder until they engineered their freedom.
Casey and April's great-grandson and heir to both O'Neil Tech and the Jones fortune.
Cody's robotic caretaker, who only barely tolerates the turtles.
Cody's uncle and legal guardian, he uses his position as the C.E.O. of O'Neil Tech to facilitate various shady dealings.
An alien invader who has determined that Earth is the ideal planet for him to spread his gene-seed.
Constable Aloysius Biggles
A robot who serves as an officer of the New New York Peacekeepers and who keeps running into the turtles.
An A.I. who serves under Sh'Okanabo.
An O'Neil Tech intern and friend of Cody Jones.
A cyborg who runs the Street Phantoms, a New York gang.
The Inuwashi Gunjin
A quartet of winged humanoids who serve as Darius Dun's reluctant enforcers.
The Dark Turtles
Created by Sh'Okanabo from the turtles' genetic material, these four mutant turtles serve Darius Dun.
A famed mercenary who has several run-ins with the turtles.
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.