And as weird as it sounds, it also makes me think of Ruby's character. Probably because most of the appeal stems from the fact that she's so mysterious and dark and an outside, being haunted by her own past.
Not weird at all. She lacks the teeth perhaps but she really is a demon, like a vampire. I think the difference may be that we haven't seen her real "tortured soul" part, because as Kripke says, she keeps her cards pretty close. But I think the potential is there.