Pilots are a dime a dozen.
I'd try to stick to the thief role. Just think broadly of what you maybe able to do.
Fleur was a well known bounty hunter which I am sure had some sneaky tricks and skills. Maybe try and do jobs for bigger groups as a contractor, building illegally, scouting territory, etc.
I will say that I find it weird that you got upset about finding a gun and taking it with you, then saying your character was planned as a thief anyway. :)
When it comes to it, just imagine what your character is like, what he does, goals, and the stick to it. It may evolve as time goes but it will help give you direction. Then don't forget to role play it.