Ghosts, Werewolves, Tengu and all other sorts of creatures.
There are even Vampires there of all stripes, so...
Why not mix both this and Vandren's idea together?
Already have werecritters, vampires, and spirits worked in. :) Actually, I almost always include werecritters, but that's another story. Basically on intelligent species I've factored in:
Constructs (Golems, Gargoyles, etc.)
Dwarves (more Nordic based)
Elves (both working fae and noble fae, sort of)
Hybrids (Centaurs, Satyrs, Fauns, Merfolk, etc.)
Nymphs (Greek, probably not suitable as PCs)
Spirits (Ghosts, Ascended Beings, etc.)
Trolls (again more Nordic based)
Mixed Breeds (half-X and half-Y, not entirely common, but present)
I hadn't planned on intelligent dragons, though. But, I'd be willing to reconsider if a good case is made.
My plan was/is to say that sorcery and witchcraft require talent. The former is genetically based, the latter isn't. Both talents are most common in the Human population, though present (if rather rare) in the non-Human population--and incompatible with werebeast genes, vampirism, and constructs for various reasons.