A few ideas that might fit in with the Adventurer range - less guns than the existing types, but usable for roleplaying/zombie/skirmish games:
1) Traveller/scavenger - Rucksack on shoulder, right hand in jogging top pocket (could be concealing a weapon), left hand either at side, or holding a crowbar.
2) Handyman - toolbag in left hand, or slung over shoulder, with tools protruding - maybe a tradesman, or a housebreaker, hammer/large wrench in right hand.
3) Paramedic type - overalls, firstaid kit in hand