Already we have a list that you can choose from, mostly comprised of beings you've already heard of, such as:
Vampires
Sirens
Humans
Faes
Merpeople
Angels
Demons
D'ni
Elves
Centaurs
But this is not all you're limited to! It's all allowed, really. If you can tell us about it, it can, and probably will, exist on Tehregahl or Avila.