Man. I don't think I've -ever- given so many likes on one thread alone.
Regardless, the things I have managed to gather here, in this very thread (as I'm not that old, just one year, hehe), is that, well, if you can bring reason to your character being the way that s/he is,
then just do it.
Then you'll be able to tell all those 'Your-character-wouldn't-do-this' dudes and dudettes to just look on the wiki. If it's approved, it has most likely been through GM reading. And lot of it.
But if your character is not approved, well, I believe most players that tell you to BE the stereotype race, are just
suggesting a <insert race here> wouldn't really do this, but
it is, nonetheless, possible.
(as long as, well, you don't go too damn far :P. In which case, though, you should contact a game master)
EDIT: I've actually had one of this crazy ideas just the other day. I wanted to make a mute shaman draenei that will use the very wind to tell his targets what he wishes. I have directly confronted this idea to the GMs, both from reasons of not being exactly sure the wind would answer, and from reasons of, well, maybe-being-OP-or-copying-a-lore-character. Which is exactly what happened. The both. I've been expecting it, so I just left the GM 'interogation' chair with an "Oooookay." I mean, was there anything to add? Mnope. Could I convince the GMs and myself? Mmmmmnot really.
..
My two cents?
EDIT2:
Don'tkilltehKira.D:
EDIT3: Oh, and in case you've seen me using caps lock in this thread. I wasn't yelling. Just.. pointing a.. point. I've used and will use bold instead. :P