miker71 said:

Only the later EU stuff paired these together (and West End RPG IIRC) until then I thought all the bounty hunters worked alone.

Hmm, I always just assumed that the droid belonged to the alien (perhaps this is very droidist of me? Nothing in the movies ever gave any indication of robots living independant, though they exhibit their own personalities, they are always refered to and treated as property). The robot (don't even know what to call him anymore) is obviously built in the image of the race of aliens from which the humanoid belongs to, so it would be natural to infer that they work together, or that one owns the other.