Here are some some characters that I had in the past:
Regui - he was once good, cruel sometimes, but good. To his family, his friends. A certain series of events affected him badly and became a strange and vicious cannibalistic beast. He had no memories of his family how ever he was oddly drawn to them. He stalked them and attacked them, attempting to devour them. He was eventually slayed, and returned as a broken soul, forgiven by the majority of his family but feeling uncomfortable around them.
Shinjitsu - a power hungry, lying and manipulative lion who cares for nothing but personal gain.
He hasn't been roleplayed much so he is not very developed.
Dune - he was powered to avenge his family and murder his brother who had betrayed them and caused the downfall of their empire. He is bitter and sarcastic, and has a heart filled with hate. Eventually the brothers made up but, but he's still not the best person around.
See? No super powers, no OMG EMU I KILLED MY MUMMY WHEN I WAS A CUB 8C Just some well thought out characters with good plots.
Evil characters have such a bad reputation because noobs try to play as them and they know nothing about character development, and they have no imagination and just copy the stereotypical evil characters.
I have to say though, one of the best bad guys of IT was Dante Donovan fo' sure B)