I hope this necropost is fine, because this thread really needs to be revived
Anyways, I would have red and black armor, with some of the ruins from mortal instruments (entertaining series, but not well written) on it. Right gauntlet would a deployable whip/garrote wire in it. The left would have a dart launcher (not into the ones on the knees) and a knife where the flame thrower is in the "standard" armor. Specialized sniper, with a modified verpine. I would hang back and provide support for the people out at the front.
Don't have a solid background for the character yet, but I would probably be mando born. I've toyed with the idea of giving him a lightsaber, and a small connection to the force (not enough to be noticeable by jedi or sith).