Xever Montes

Xever Montes (later known as Fishface) is an antagonist in Teenage Mutant Ninja Turtles. He was once a Brazilian street thug living a life of crime, but then became a member of the Foot Clan after its leader, Oroku Saki, bailed him out of prison. Xever later gets mutated into a mutant fish, who Michelangelo nicknames "Fishface", which he finds to be insulting.