The Ghost of Rufus Raucous was the disguise of Phylidia Flanders. Flight - the illusion of flight and levitation was a magician's trick. Shooting flames - Not explained, but no doubt a staged trick was used.  Her costume was based on the real Rufus Raucous whom went missing and was presumed dead. She did so that she could become the main attraction of her own magic act, but Del Stone wouldn't let her perform them.

Ghost of Rufus Raucous