Fan Casting The Grey Lady in Harry Potter: The Full-Cast Audio Editions

The resident ghost of Ravenclaw house. In life, she was Helena Ravenclaw, the daughter of Hogwarts co-founder Rowena Ravenclaw. Seeking to overshadow her mother, she stole her diadem, though was killed shortly afterwards by the man who became the Bloody Baron, the Slytherin house ghost. Centuries later, Tom Riddle Jr. deceived her into revealing the diadem's location so that he could make it into a Horcrux, though she later helps Harry to locate and destroy it.