Werecreatures/Demonic Vamps.

Idea: A universe where werecreatures and Demonic Vampires live among the humans(who may or may not know they exist). 

Werecreatures are usually end up being a larger version of whatever one animal they ended up with. They have human forms, but in their animal form, they can either retain some of their human futures or they end up looking more animal-like. Whether they were bit or born is unknown.

As for the Demonic(A type of vamp I made up), when they first turn, they seem like any other vampire, but they're not. These are the ones who have another side to them that will awaken somewhere down the line. These would be their soon to be demon forms. The majority usually can't control their demon side, however there may be a select few that can.