Doctor Damien Faust

He definitely gives off the energy of someone who can make himself out to be a better person that he actually is. Very manipulative and charming in the most dangerous way, and someone you definitely wouldn't want to be on the bad side of. Also, despite how demonic he appears, I like to imagine that's something he can hide if need be to pass as human, like in his "profession", to trick people into trusting him enough to be his next meal.