Ghosts

Ghosts are the souls or spirits of deceased persons or animals that can appear, in visible form or other manifestation, to the living. Dipper and Wendy had an encounter with two ghosts when they visited the Dusk 2 Dawn.

History
Wendy and Dipper encountered two ghosts, named Ma and Pa, at the Dusk 2 Dawn convenience store. Dipper was able to calm them down, and allow him and his friends to leave.

In "Irrational Treasure" ghost are mentioned by Sheriff Blubs when he takes out a book about them to read with Deputy Durland.

In "Fight Fighters," Soos said that when his house was haunted he learned how to eat ghosts.

Personality
According to 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.