I am thinking Human or Zabrak. Humans fit nicely into all story lines, so I will not discuss them.
As for Zabrak, outside the purely cosmetic choice in Seethe icon, I think it is not that inplausible, with some interspecies breeding, and lots of time passed, so plenty of your ancestors could be Human, and Zabrak are not that different from Humans.
However, I am wondering about the endgame story
Is this somehow reflected in game, or do they just go something like "Ok, your are strong, join us"?