a poltergeist that likes to play tricks

the poltergeist at Hogwarts (SS7, 9; CS8, 11; PA7, 8, 9, 22; GF12; OP30; HBP15, 18, 19, 23, 25, 29)

Peeves is a poltergeist living in Hogwarts, a fictional setting in the Harry Potter books by J. K. Rowling. He's a spirit rather than a physical being, but highly different from the ghosts he's occasionally mistaken for.