Serenity RPG

So, on the one hand, I promised everyone who actually bothered to sign up for my Serenity RPG that they could play, on the theory that its once-in-a-while status meant that not everyone was expected to be there every game. On the other hand, my players who haven't made a character yet are desperately seeking a "Niche". Other than Reader (which is banned), What am I missing?

Amazon
Companion
Engineer
Hacker
Medic*
Pilot
Tactician*
Thief

* means the character has been made but not played.