Nicholas de Mimsy-Porpington (known as Nearly Headless Nick) is a Gryffindor House ghost from the Harry Potter franchise.
When he was executed on Halloween 1492, the axe was blunt as Nick met his demise. Now as a ghost, he came back from the dead to haunt Hogwarts. He is somehow friendly towards humans and other ghosts. On Halloween 1992, he had his own 150th deathday party, a party dedicated to an anniversary of a ghost's death.