Maybe add character reactions to events. Like if a player enjoys or dislikes something. possible animations to the character to reflect this. maybe make the character look tired if he’s been working a lot. and maybe make the character look energetic if he got a good nights sleep. i dont know how complicated this could be but may make the character look more interesting. just idea to make game seem more ‘fun’. 
i don’t know if this is already possible with your unity engine.