User blog:Matarrok/Can I create a new type of shark?

Hey Guys for a character of mine. Hatred. I need either a species of or devil fruit to explain how he got his abilities. Right now i'm leaning towards makin a new type of shark called Shredder Shark. This is mostly because i thought he was a bit too different from a cookie cuttter fishman. Anyway, is this fine because i don't really want to break canon?