Well there a few neutral things that every faction has in common. And we'll start of with the Villagers and the jobs they have starting off is the gatherers they simply go into any resource point like a mine or a field then bring back to the closest thing but upgrades will allow them to carry a wagon size and replenish those sites.
Next one is worshipers now there main function is to worship so you gain divinity and favour which is. Just essentially magical and research points from a Temple but an Altar is where you can spend. Divinity to cast spells and blessings but shrines are just aesthetic add ons which raises efficiency of all working class jobs. Onto the militaristic ones you got the. Black smiths who work hand in hand with solider classes to bring out their best and strategists who will be the guiding hand behind your decisions. Also some factions have religious people who can amass a body count real quick. For the final one you have the stay at home people who keep the place the place clean and give birth give birth also they can be use to run the more passive structures like a nursery, theatre and a public bath. (Some faction will have unique job types in favour of the old.)