So, I was thinking about what possible characters could show up in the first expansion. Pretty quickly, I settled for:
Leadership (2), Tactics (2), Engineering (1)
Communications Officer: Once per turn, after you activated the communications-location, you may take another action.
Emergency Jump Expert: Once per game, you may activate the FTL-location to have Galactica jump immediately. This jump can be initiated even if the jump preparation track would not allow it. After the jump, reduce the population resource by 1. Do not lose any other resources as result of the jump.
( I have yet to figure out a good disadvantage)