Fishface from the modern Teenage Mutant Ninja Turtles cartoon. I have the action figure so, all I know about him came from his packaging. ( I think I prefer it that way ). Here he is in West Virginia's Pipestem State Park.
For a quick rundown, Fishface used to be a goon of the Shredder's named Xever, along with a Chuck Norris knockoff called Bradford. At one point, the Shredder gets his hands on Kraang mutagen (The Kraang being this universe's obligatory "Brain guys in human suits", and are a combination of the Utroms and Krang, being evil scientists from Dimension X) and turns them into fish and wolf mutants Mikey nicknames Fishface and Dogpound.
Later on, Dogpound gets accidentally mutated again and becomes... well, that would be telling.