What about a chemist? This is something I've brought up before, and in no way was my idea... But imagine this, you're a musketeer or something (some core class with a pistol) and your job becomes chemist. To heal a party you throw a potion up in the air and shoot it, heals rain down... There's a lot more to this idea, but it's not worth going into here. But this job could be both a healer and an enfeebler. Throw some acid at a mob, defence down etc etc..

I'd play that class...