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Ghosts are creatures that inhabit Club Penguin Island. Players could transform into a ghost at the Ghost Lab during the Halloween Party 2018. The color of the ghost depends on the color of the penguin.
- Gariwald VIII - Gary the Gadget Guy's great uncle, who is an inventor and paranormal investigator
- Ghost of Yesterday - A character in the stage play A Humbug Holiday.
- Ghost of Today - A character in the stage play A Humbug Holiday
- Ghost of Tomorrow - A character in the stage play A Humbug Holiday.
- Jacob Mukluk - A character from the exclusive Christmas book, A Penguin Christmas Carol, who is a former pizza parlor worker.
- The Glowing Ghost - A character in the stage play The Haunting of the Viking Opera, who reveals to be a costume designer.
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