Ghost

A Ghost is a poor, unfortunate soul who got lost between its body's death and the afterlife. They wander the Earth, in search of their unfinished business, until Death brings them to where they're to go next, be that the pearly gates of Heaven, or the depths of Hell. Some ghosts have faintly corporeal forms, and have been known to leave a trail of ecto-plasmic "slime" in their wake.

A select few humans have mastered the capture of ghosts. These humans are called Ghost Busters.

Halloween Horror
The Ghost spooked Medusa in the first round, and terrified the Sea Creature in the second. Round three saw the Ghost outlast a Vampire, before being brought to the afterworld by Death in the final round.