Magical creatures in Harry Potter harbor an attraction to imagery morbid and melancholy. Ghosts are very sensitive about their condition: when the Ministry initially classified them as sentient creatures with full legal rights, they claimed that the term was insensitive and received a separate "Spirit Division", apparently to control the activities and haunting locations of troublesome ghosts (as when Myrtle was forced to haunt the place of her death (Hogwarts) after she had disrupted the wedding of the brother of Olive Hornby, a girl who had teased her at school). Named Ghost characters: Peeves, the Hogwarts poltergeist, is not considered a ghost, but an "indestructible
Hogwarts staff However, in the American edition of "Half-Blood Prince", it is re-spelled as "Sybill", matching the UK edition. Professor Trelawney is portrayed by Emma Thompson in the "Prisoner of Azkaban", "Order of the Phoenix", and "Deathly Hallows Part 2". Hogwarts houses at least twenty ghosts, but when people in the novels speak of the ghosts at Hogwarts they usually refer to one of the four resident ghosts of the Hogwarts houses: Sir Nicholas de Mimsy-Porpington (or, as the students refer to him, Nearly Headless Nick), the almost beheaded ghost of Gryffindor house; the Bloody Baron, who is the ghost of Slytherin