@Dizz: There are no limitations on race. But you'll have to deal with the consequences. 

@Kai: No. They were not. They were *nearly* wiped out. The reason Impa hid out with Zelda for all those years was because Ganondorf was looking for Zelda... not the last Shiekah so he could "kill off the rest". That's canon. Feel free to look it up on the Zelda Wiki, but think about it-- why would Zelda disguise herself as a Shiekah if it was Ganondorf's goal to wipe them all out? 

As I said before, it's unlikely Impa's line would be connected to today's Shiekah leader. She took up the role of a Sage and her last departing words to Link are a request that he look after Princess Zelda on her behalf-- because she's got Sage stuff to do and can't. All in all, she WAS simply Zelda's nursemaid-- albeit a badass nursemaid. It was never mentioned that she ever was the leader of the Shiekah. Not in Ocarina of Time and not in any other game either. That's canon.

Like I said in the first post, this RP will be VERY largely based off of what is canon. The Wiki will be like my Bible, as I said before.