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The following is a list of main characters in the Teenage Mutant Ninja Turtles franchise.

The Teenage Mutant Ninja Turtles are a team of mutant red-eared sliders named after four Renaissance artists and living in the sewers of New York City, where they train by day and fight crime by night as ninjas.

Leonardo is the cool, calm, and courageous leader of the Ninja Turtles. He is the most devoted student to Master Splinter and the study of Ninjutsu. Leo wears a blue mask and wields two katanas.

Michelangelo is the comedian and party dude of the Ninja Turtles. Mikey wears an orange mask and wields a pair of nunchucks.

Donatello is the scientist, inventor, engineer, and technological genius of the Ninja Turtles. Donnie wears a purple mask and wields a bo-staff.

Raphael is the tough, sarcastic bad boy of the Ninja Turtles. Raph wears a red mask and wields a pair of sais.

Splinter is the mutant rat sensei and adoptive father of the Ninja Turtles, trained in Ninjutsu by his owner and master, Hamato Yoshi, in Japan.

In the 1987 cartoon, Splinter (voiced by Peter Reneday) is Hamato Yoshi, mutated into a mutant brown rat alongside the Turtles, who he rescued from accidentally getting dropped down a storm drain after moving to New York.

In 2003 cartoon, Splinter is the rat pet of Hamoto Yoshi. Splinter mimicked Hamato Yoshi's movements while he was practicing. After Hamato Yoshi was murdered by Oroku Saki, he ran away from the cage and became homeless. In a car accident, Splinter was exposed to radioactive ooze after rescuing four baby turtles. He grew bigger in size and more intelligent the next day.

In the IDW comics, Splinter, as Yoshi, was a member of the Foot Clan until he defected to start his own clan, the Hamato Clan, with him as the Hamato's jonin (leader), upon learning of Shredder's true intentions. Thus, he was branded a traitor by Shredder and killed along with his wife, Tang Shen, and their four newborn sons. Centuries later, Yoshi and his sons were reborn in a company called Stock Gen when his soul was reincarnated into a brown rat and theirs into red-eared sliders, they were later mutated bringing them back to life as a mutant brown rat and four mutant red-eared sliders.

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