* Joey: The skeptical, initially reluctant protagonist who ends up spending the night at the haunted house.
* Liz: Joey's adventurous and more easily frightened sister, who is initially excited about the haunted house. She plays a significant role in the unfolding events.
* The ghosts/creatures of the house: While not single characters in the traditional sense, the various ghostly entities inhabiting the house are central antagonists.
While other characters appear, Joey and Liz are the core focus of the narrative.