Happy Haunts Revival?

We have ghosts. What about the option to add a ghost or spirit to the household without using cheats. When the ghost is selected we could have the option of ghost view where the living appear transparent and other ghosts appear solid. Vampires might appear in their vampire form. The grim reaper might appear as a youthful teen boy in a toga (a nod to Hermes). In the least they can react with the Reaper. Ghosts don't have the same needs as the living. They don't need food or sleep etc. Ghosts do feed on energies. Positive or Negative emotions. Being around different moods will result in the ghost's levels of good or evil. Reaching the near max has positive or negative side effects. Maybe Halos or Horns or positive or negative abilities like shedding light or casting darkness. Finally, maybe, ghosts can be made in CAS as great grand parents or lost sibling, or even an ancient sea captain who haunts the family manor.