This type is defined as an undeveloped form, insubstantial, and difficult to see. The interaction is limited. These are typically spectral lights, voices, and sounds.
This type is defined to have actual visual characteristics and can physically manipulate things like a poltergeist. These forms tend to be vague and inconsistent like hands or a face floating in the air.
These begin to take on forms of a distinct human being such as face, torso, and arms. They can often change their forms as well.
These are class III ghosts revealing their identity which reclassifies it as a class IV. It is usually indistinct from the chest down.
These are ectoplasmic manifestations but are non-human forms. It is said that these are formed from emotionally charged events or locations.
These are non-human or animal forms
These are described as a malevolent with powers far beyond human. The powers include the ability to change form at will, dematerialize objects, summon pests, or possess people and animals.