Ghosts

Ghosts, also known as Spirits, are inter-dimensional ethereal entities that serve as physical representation of the spirit of a dead person. Many different types of ghosts exist. The word "ghost" is used as a collective term, meaning all different types of ghost characters of any species across the universe. Some are common enemies, some are more benevolent, some show sentience, and others seem to be bent on destruction purely out of hatred and malice.