I like the attributes idea. Is it based on just how we think our character's stats should be? I think we're all reasonable enough not to just max everything out, after all, and we all had an image of our character's limitations and abilities when making them. For instance, I imagined Freddy as a sort of combination controller/tank/versatile damager, hence the huge hammer and aggressive melee style. I'd imagine him as something like:

Commando 8
Ravager 8
Sentinel 10
Synergist 10
Medic 0

Not sure what these bonuses would do. :P