How is the ninja turtles master the rat guy?

The Teenage Mutant Ninja Turtles' master is Splinter, a wise and skilled martial artist who is a mutant rat. In most versions of the story, he was originally a human named Hamato Yoshi, who transformed into a rat after exposure to mutagen. Splinter trains the turtles in ninjutsu, imparting lessons about discipline, loyalty, and honor, while also acting as a father figure and mentor. His guidance helps the turtles grow into skilled fighters and protectors of New York City.