What about ghosts? There was Topper
(1953-1955) and The Ghost and Mrs. Muir
And angels: The Smothers Brothers Show
(not the comedy-variety hour, but their earlier black-and-white sitcom that ran for one season in 1965-66), Highway to Heaven
(1984-1989), Touched By An Angel
(1994-2003), and the aborted Marx Brothers sitcom Deputy Seraph
And there was I Dream of Jeannie.