Splinter Overhead Mask
Master Splinter trained for years to become a master. Before that, he was just plain old Splinter. Not very impressive sounding. But after decades of perfecting his martial arts, after raising and instructing his turtle sons, he's definitely earned the title. He didn't go to eight years of Master medical school to be called Mister Splinter, now did he? Don't ever push him on it, because if you go up against Master Splinter, you're going to get put down, hard. Fortunately, Splinter is generally a pretty nice rat. He lets the turtles eat pizza, and even has a slice here and there. And sometimes he even lets slip the occasional "Cowabunga!" But if he or any of his kids are threatened by the evil Shredder, then sparks will fly. So don the mantle of the great one and become a master yourself. Yeah, you're a rat, but you're a highly skilled and deadly martial arts expert rat. Kinda evens things out.