I would say at least use NPCs until you develop a following, then you may be able to phase them out eventually. I suggest having craftable and upgradeable guards to guard your city while you're offline. They may start as simple militia men, with staves and scythes but then eventually evolve into some guards with plated armor, steel weapons, etc. If you want to go the crafted route, it may make sense to make the guards some kind of mechanical NPCs where you can upgrade their offense and defense systems.
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