I think NPCs should have markers above their heads regarding whether they have quests, if you’re currently doing a quest and whether you’ve completed their quest to make navigating safe zones easier!
Silver question marks for in progress quests and gold ones for quests ready for turn in
It should be only quests, though. If every type of npc interaction was marked, some npc scenarios would break, like if you are using a npc for something besides a humanoid (with the cats being an exception, I think it would work fine for them) Like an atm, or button of sorts. Other than that, I love this idea.