I just had an idea which I think is a very good one.
A part-time cop. You're on patrol around the streets for a certain amount of time. If you see some men beating up a guy (something like what was happening in the harbour in Shenmue 1 and criminals are actually part of the game like normal people) then you go and kick their ass and take them to the station. No uniform or anything....
Or working in a shop, just welcoming people or something.
NOTE: These two won't be in Shenmue III because it's in Guilin. These were just ideas and they should've been in Shenmue II.
You'll probably be working in the fields with cows...