Post characters who are nasty, vicious, spiteful, and malicious as well as diabolical. Even hateful

Not a lot of kind things to say about Dilandau Albatou from Escaflowne, who's really a little sh*t with some armed men under his command. Except that it's not his fault he's this way. The Zaibach Empire altered his personality to serve it. He was originally Allen Schezar's sweet little sister.

Naraku - InuYasha

And for the record I'm posting this with a huge smile on my face. He's my favorito! character on the show.

Muraki from Yami no Matsuei

This anime is not for young children, and it is mostly due to him.