Revenant

A revenant is a person who returns as a spirit after death.

Though similar, revenants are not the same as ghosts. They differ in these ways:
 * I'm dead? - Probably the most important and key element that makes a ghost a revenant is that they do not know or believe they are dead. They have either forgotten or suppressed the memories of their deaths, or believe they truly have risen from the grave.
 * Continuous Manifestation - Unlike "normal" ghosts, which often appear violently in short bursts, once revenants manifest themselves, they maintain their presences. Their embodiments do not flicker or jerk with motion.
 * Corporeal - Revenants are solid. They cannot pass through walls and are able to interact with their environments as easily and constantly as the living, possessing the same metaphysical constraints as they did when they were alive (i.e. weight, strength; they have shadows, etc.). This also makes them vulnerable to injury and pain.
 * Full Awareness - Unlike many ghosts, a revenant's consciousness is fully intact. Their thoughts are not erratic or governed completely by emotion (fear, anger, pain, etc.), allowing them to have complete thoughts and progressive, linear thinking. They can carry on full conversations and be reasoned with, and do not always see things strictly as "black and white"
 * Lack of Ghostly Powers - Revenants do not demonstrate common ghost abilities. They cannot appear or disappear, teleport, move objects/people remotely, read thoughts or pass through walls.