At the very end is it not a big deal that an "alien" is on the Dark Council?
Is not the SI the first "alien" Dark Council member or is this only mentioned if you play an "alien" species?
My Assassin was a Pureblood, and my Sorc a Twi'lek, but I can't for the life of me remember if there were any species-specific conversations that late in the game.
But regardless, the Empire is a meritocracy, so being an alien doesn't mean you will absolutely not get anywhere in life, you are just considerably worse off. Think of it as playing Doom on the Nightmare difficulty. :P