[@AtomicNut] hm. It's pretty much open field at the moment. I suppose we could use any "bad guy" if you are into that. Perhaps someone who wants to kill/rule everyone not of their kind, like a overly dedicated vampire hunter who heads a secret organization, or conversely a vampire of the same mindset. We have a lot of peacemaker types, and it's hard to drive a story without at least a few decent assholes. 

Also, the werewolves are under represented. You could play a pack leader who is hellbent on revenge against vampires, and/or humans probably, and convinces his pack to attack someplace.... start another war... I don't know. Keep in mind there aren't many WW's and most of them live in very remote areas of the world. You can ask me for details if you want. 

Anything is fine. Don't feel restricted.

Consider looking at the current list of characters and developing an interesting history with one of them to better tie into the story. 

A human mad scientist would be stellar. That position is wide open. 

Anything is fine. Don't feel restricted.