[quote=@Vampy]
<Snipped quote by CallMeChaotix>

that is called a halfling 
[/quote]
Its called a halfelf

Halflings are short people. 

As for Neko and Kitsune I would like to say that perhaps these are forms of lycanthropy. Except perhaps that while in "human form" They have ears and tail representing the animals. What are they Foxes and cats?

Demons are a bit of a stretch but could be possible. Although it would probably be easier to be Half Demon or Half Devil.  

As for Vampires... are also changed by a curse or virus… Like Lycans and other mystical bloodline infections/curses.