Master Splinter, born Hamato Yoshi, is a Japanese man in his mid fifties. After being exposed to a mutagenic substance, he was turned into a mutant rat. He has a tall stature, with large ears, a long tail, and fur in varying shades of black, brown, and white. He wears a plum colored robe. He has four sons, who are mutant ninja turtles: Leonardo, Michelangelo, Raphael, and Donatello. Splinter is a ninja master and sensei, struggling to figure out what to do next now that his sons have grown up and going on different paths.