Also, if you don't want to just rehash oh waiter completely, there is always Fae/Changelings. Like the twist your mind into mush and make humans your pets kind of Fae. I been looking for an RP like that a while, and it could pretty easily incorporate other supernatural into it.

Edit, for those who don't know what I am saying by changelings, in this case, I mean a person physically morphed by Fae magic, normally indefinitely.