NPCity is a really small project where I simulated a lot of NPCs living their lives.
Each NPC has their own room, a job and a favorite bar or restaurant in one of the skyscrapers and all of them have their own unique day and week schedules.
Inspiration came from Chapter 34 : 1000npcs at 60fps from the book GameAIPro3,
The more Npcs you have to manage in a game, the more abstract they can be.