18. Barty Crouch, Jnr
Barty Crouch Jr's relationship with his father isn't great, which is probably why he looks up to Voldemort as a paternal figure... if that were even possible. Barty is addicted to pleasing Voldemort and the fact that he impersonated Mad Eye Moody for a whole school year during The Goblet Of Fire emphasises his desire to do well. Barty's true power lies in the art of deception so if you can fool everyone at Hogwarts, including Dumbledore, then you're probably winning and very much a wizard to be reckoned with.