I am starting out with DH2 and with out a group I am going solo with the mythic game master emulator (loads of fun for test driving new games) I have a concept of a "untouchable" bounty hunter, homeworld and background have been fairly easy Hive World and Outcast, but now I am stuck on role. Would I be better served with the desperado role or the seeker role? Which would be of more use and more importantly work as a representation of the character. His untouchable advance would justify his working alone as a bounty hunter the role is where I am getting hung up thanks for any input in advance

I don't really think there is a "wrong" choice here. What weapons would you prefer using? Or, what do you see yourself doing that you enjoy? The two main categories are generally combat and non-combat. Just think about what your priorities/end-game fantasies are and the choice should come naturally.

Do be careful about picking a Role with a Fellowship Aptitude though. Seeing as Untouchables nuke their Fellowship right at the gate, you'd essentially be "wasting" an Aptitude. This is from a mechanical viewpoint rather than a narrative one.

From a purely narrative standpoint, I think Seeker is a little bit better fit.

From a more crunch-conscious standpoint, Seeker has aptitudes in both Fellowship and Social; and as Asymptomatic pointed out, being an Untouchable kinda hamstrings you in those areas.