I've been thinking of perhaps making a character for this, to add another member to the deckhands. What I've considered so far is a (Denar) former imperial soldier (perhaps combat medic) gone rogue for one reason or another. Another option I've thought of is a (Alori) spy who had been sent to infiltrate the empire by some sort of organization/faction but who had to flee both powers due to being 'compromised'. Might there be space for one such and does either sound viable?
Either one sounds good to me. (I advise you read the above post by Menacing Effect when it comes to the Denar)
However, between these two, I'd personally advise the Alori. Not just because we have a medic already and a surgeon as well, but because I can help you in regards to who sent them as a Spy. But I know it'll be a deckhand either way, so whichever one you feel comfortable with, I would advise doing. ^^