After an extended bout of recording and getting used to hearing my own voice, I have a feeling for making a demon game.
Maybe start with a MR of 10 and no powers and then try to jack up your MR until you can GO SOMEWHERE to pick on mortals and on the way try to pick up demonic powers such as fire spells (if you come from a fiery realm), cause disease, fear and hatred in mortals and so on.
I don't suppose minor demons are born of mothers and fathers - where do they come from? I imagine they get bullied a lot and work as slaves for bigger demons unless they claw their way up the heap or get a lucky break.
Maybe it will land and become a game...