Splinter (TMNT 2003) (Splinter)

Splinter is one of the two overarching protagonists (alongside Hamato Yoshi) of the 2003 "Teenage Mutant Ninja Turtles" cartoon series. He is the adoptive father of Leonardo, Raphael, Donatello and Michelangelo. It is later revealed that he was originally the adoptive rat of Hamato Yoshi and had to wander in the sewer after his owner was murdered by the Shredder, before finding the Turtles and adopting them.