Well I'm intending to be a human myself since I've already got a character in mind, but maybe having at least one person in the group play a less powerful version of a supernatural creature could be interesting. Maybe something like an Angel that's lost it's Grace, or Witch that's not evil or just doesn't use magic. That kind of character could be the one who knows a lot about identifying and how to kill things to contrast the pure Hunters of the group, who are really good at killing things. Just a thought.