Flinter

He is Rat that clearly references "Splinter" from Teenage Mutant Ninja Turtles. He is a Mini-Boss, since he's the only One of his unique Breed. He is probably more mutated than the other Rats. You can find him near Don, Leo, Raph, & Mike. They are references to "Donatello, Leonardo, Raphael, & Michalangelo.