A new race: Vampires.

Yes, if someone considers themselves a vampire, that's their problem. No need to argue about it. In my opinion, a faction consisting of some kind of "monotypic" creatures looks unappealing. There's no need for vampires or werewolves. A faction of extraplanar creatures, as I think, would look cool. There could be mephits, ifrits, pharat, and so on.