Well, i have a vauge concept of a pistolier from the Total War: Warhammer game. Horse, couple of pistols and thats it. Im also thinking about making him a little bit of a whimp. Eg: he would much rather be an ambusher or use his horse to circle the enemy picking them off and be in no 'real' danger himself and run away if directly confronted. 

So a well armed scout or a significant problem for any infantry units without the speed to run him down. As for base profession, probably a scout for the Imperial Army or something like that. 

and i have an idea of a dwarven engineer who's ultimate goal is to build a steam-tank or something equally absurd, and be a heavy (large calibur) gunner who's main job with the party is to put sling lead and fix other's guns... and be a dick to Knights because "Yar a t'ing of the past laddie, tanks are gonna put you lads out of work."

at the beginning though im thinking... an apprentice engineer with a blunderbus, a warhammer and possibly some cheap armor.