Ahead of Fable's February 23, 2027 release, game director Ralph Fulton has detailed how Playground Games built the reboot's Living Population system, which populates the game world with roughly 1,000 NPCs, each with individual routines, personalities, likes, and dislikes. Bowerstone alone contains 400 of these NPCs.

According to Fulton, the studio originally had a tool that could randomize an NPC's traits, look, and job, calling it a potential 'massive labour-saving device' that would have saved the team significant time. However, the developers found that randomized NPCs often didn't make sense—resulting in mismatches like a vegan butcher, a pacifist weaponsmith, or a hairdresser with an unflattering haircut.

Instead, Playground Games chose to individually pick every trait for every NPC by hand, a process Fulton described as 'downright Herculean' when applied across all of Albion. The goal was to create NPCs that were consistent and 'readable' from top to bottom, so that their appearance, job, and personality all logically fit together.

This hand-crafted approach ties into Fable's broader simulated economy, where NPC traits like 'hard-working' and 'helpful' directly affect business profits—reportedly boosting yields by 20% in the case of the hard-working trait. Fulton noted that farming ventures, which support six workers, are especially lucrative if stocked with hard-working NPCs, a strategy he said he learned from his own level design team.

Fulton also described technical challenges in building lifelike routines for NPCs, including spouses and children who go about their own schedules rather than waiting for the player. He mentioned a bug encountered during testing in which a playtester's in-game wife would teleport around at odd hours handing out birthday presents at random; this issue has since been fixed so spouses no longer wake players in the middle of the night.

Overall, Fulton said the game's systems allow players to 'transform the economic future of people' through choices as a landlord or business owner, with actions like adjusting employee wages affecting both profit and in-game reputation, which can result in complex, even contradictory, character descriptions such as being both 'charming' and 'Scrooge-like' at once.