Some sort of basic npcs like bandits, bandit encampments,villages/towns with traders/settlers/townies and maybe quest givers,random wanderers who could be peaceful/hostile,maybe also some kind of employable npcs to make singleplayer enjoyable, because the limit of 64 players sucks for multiplayer, and the singleplayer is just boring, with only 64 players servers are usually either full or with only a few players online