Ghost

Ghosts were a type of visible, and sometimes tangible, disembodied spirit.

Ghosts were usually thought of as spirits of the dead, and depicted as chalk-white humanoid figures, or looser, floating spirits in shrouds. (COMIC: Ghost Story) Indeed, Arganthone-056 once faced such a spirit, the Ghost of the First Premium Turkey. However, the term was sometimes used to refer to spirits which embodied concepts, rather than deceased mortal — including the Ghosts of Christmas Past, Christmas Present and Christmas Future. (PROSE: The Time of the Toymaker)

Many ghosts resided in the Strange and Wonderful House, but found “other places to haunt” prior to the Fall of the Strange and Wonderful House. (PROSE: Our Strange and Wonderful House: Our Strange and Wonderful House (novel)#Chapter 60: The Fall of the Strange and Wonderful House)