Ghosts are the souls or spirits of deceased people that can appear, in either visible form or in other manifestations, to the living. They are divided into 10 categories based on their threat level, with 1 being virtually harmless, and 10 being the most dangerous, as seen in "Northwest Mansion Mystery." The first ghost encounter was in "The Inconveniencing" when Dipper, Wendy, and her gang had encounter with two ghosts when they visited the Dusk 2 Dawn convenience store.
In "The Inconveniencing," Dipper, Mabel, Wendy and her friends encounter two ghosts, named Ma and Pa at the Dusk 2 Dawn convenience store. Dipper calms them down by doing the Lamby Lamby Dance, and they allow him and his friends to leave the store.
In "Scary-oke," the page in Journal 3 appears when Dipper tries to make the agents believe him.
In "Sock Opera," Bill Cipher takes over Dipper's body, leaving the latter as a ghost. Dipper uses a sock puppet to warn Mabel of this, and she fights Bill until he faints and is forced out of the body so Dipper can re-enter it.
In "Northwest Mansion Mystery," there is a ghost haunting the Northwest Manor. Dipper is able to capture him in a mirror, however, he escaped and turned the Northwests' party guests to wood. The ghost demands that the Northwests let the common people attend the party, and when Pacifica opens the gates to them, he ceases to haunt the party, restoring the people he turned to wood and passing on.
In "Weirdmageddon 2: Escape From Reality," the page for the category 10 ghosts in Journal 3 is shown when Bill's eye flashes through the journal's pages.
According to Journal 3, ghosts always have a reason for the things they do. The ghosts Dipper encountered in "The Inconveniencing" seemed mean and angry at first, but their anger diminished when they found out he was "technically not a teenager." In "Northwest Mansion Mystery," it is shown that according to Journal 3 there are different levels of ghosts ranging from one to ten, the highest number being the most dangerous form. According to the journal the only way to survive a level ten ghost is to "pray for mercy." Each type of ghost has different ways to be dealt with and captured. For example, they can be trapped in silver mirrors if they came from a painting, and then an exorcism must be performed to dispose of them.
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