Anniversary ghosts are those that appear on a certain day or period of time because of a significant event. Usually the time period would be related to their death; but not always.
Bean Nighe is a type of Banshee in Scottish Folklore. She is often described as an old woman with one nostril, one protruding tooth, sagging breasts, and webbed feet.
The vampire terrorized Breslau, Germany for 8 months before it was put to rest. The series of events started on September 20, 1591 after the suicide of a shoemaker.
Most ghosts have been described as metaphysical, having no connection with the real world. They can make a breeze or other metaphysical activities, yet they have no real affect on the world.