Non pathable, non interactable, no dialogue NPCs that count as "Traditional furnishings"
A couple idle animations for some "life" Nothing too major. (Drink from a mug, look around, fix hair...)
Different packs for each race. Each pack could contain 4-5 NPCs (a couple "fancy dressed" nobles, a couple "plain dressed" commoners).
Maybe when you place them, if you target a chair with the NPC they will sit in it.
Animal packs too.
Non pathable, that count as "Traditional furnishings"
Idle animations for "life" (Look around, eat, laydown) Maybe mild animal sound effects
Domesticated farm animals. Pig, cow/bull, chicken. goat.
Wild animal pack. Wolf, bear, senche, rabbit, deer, perched bird...
Just some ideas to add to housing that don't fall into the Houseguest, Mount and non-combat pet catagories.