NPC's do very little in the current cities/environments... most are stationary, day/night has no effect on what they do or where they go, etc.

Once you leave a city or outpost, you don't really run into any doing anything or residing in the outer-world.

You just don't really see NPC's doing... much...

It'd be nice if weather or time of day affected them slightly, at minimum.

What ideas do y'all have to increase the immersion in this regard?

I think more NPC movement in general would go a long way.

Especially different kinds like merchants passing through the landscape with their chocobo's or NPC adventurer's fighting mobs from time-to-time (ones that aren't a part of FATE's).