Ghost

The manifestation of the echo or left over energies from a living being that has died. Typically a ghost is a nebulous image but such an image typically moves in a manner similar to that which it would have moved during life. While the exact conditions to create a ghost upon ones death are unknown it is known that some kind of traumatic event just prior to death is a commonality of many ghosts.

Repeating

Some ghosts repeat a sequence of actions with a varied degree of specificity. In most cases the ghost is unaware that it is repeating actions and behaves as if it is still alive, locking into a cycle. While most often the actions are some kind of traumatic sequence which leads to their eventual death. Less common are situations where a ghost goes through a different set of traumatic events that did not lead to death while it was living. Often if the cycle is broken somehow the ghost also vanishes. The sequence of events is strongly tied to a specific location. Either an exact location (such as a plot of land) or a relative location (relative to an object). The ghost never travels very far from where or what it is tied to.

Roaming

This ghost travels freely and is not tied to a specific place. Such entities often wander endlessly and are seen across a very wide area, even in places they never saw during life. A roaming ghost teeters on the edge of awareness of the fact that he or she is actually dead. They can speak to people and even have limited ability to manipulate the world around them. A roaming ghost can and will also respond to the world around it, these ghosts may or may not be able to speak. When they do interact they do so from within the confines of the perceptions they had when they died. Thus a ghost only has a limited ability to actually understand the world it exists in.

Following

A subset of a roaming ghost are those that become somehow attached to a person. They are capable of moving away from that person but choose not to. Often the ghost becomes jealous and angry when others try to interact too heavily with the target of the attachment. The ghost will follow this person until it is forced to stop, the only exception is that the ghost will actively try to preserve its connection to the living person. This kind of attachment can also occur with an object rather than a person but it is most often a person. The person also doesn't have to be anyone the ghost actually met while still alive or even came in contact with. A roaming ghost can become attached to any person or object though the mechanisms vary widely.