Aiden E. Messer does not exist. Are they an illusion, a ghost, a mere thought? No one knows. If we are to believe one of the children they seem to work with, if they were a teacher, they would be as tall as a human. They are not a teacher. According to various sources, they have studied psychology, and have always had a penchant for horror and the macabre. They like to combine these subjects in their books.