• Poltergeist
• Ghost Lights
• Shadow Ghosts
• Apparitions
• Ectoplasm
• Orbs

These are very elusive ghosts. Many theories come about them saying they are entities from other worlds, live underground, are ghost, demons etc. But they fit all the categories as a ghost. They are usually solid or transparent black. Most are seen near walls, as if the shadow has become alive. Often the shadow ghost has red eyes. They are very quick.