Hmmm... Not quite a race, but I'd like it if we could become something else, like a secondary race (TESO has Vampires/Werewolves, for example). It'd be a neat little way to further define your character if, for example, you could become a Padjal, which could possibly boost your Mind, or perhaps give a special ability or two... Not sure what other things like that they could do... Werewolves were in Final Fantasy V, I guess we also already have some Zombies in XIV as well (which aren't all hostile).