So at the moment it's smuggler, pilot, medic, mechanic... Hmm....

Dammit, if only freeloader was a role to be accepted :D. N33t just sitting in his cabin and wasting resources :D. I guess it could somewhat pass as hacker... :D

On more serious note I guess a cook or diplomat (professional liar :D) look like open options. Open to suggestions as well.

Oh yeah also on this point:

-A part of the group being chased by a player character bounty hunter (or team if you like).

In other words one player (or more, whatever) may call bounty hunter role and try to hunt other players ? Sounds... interesting. Possible option as well :D.