'Harlequin' Demon (voiced by Greg Proops) is a monster who has many sharp teeth and three purple and orange tentacles on his head. During the song This is Halloween (song) he is hiding in the trash can and in the center of town during the festivities that happened after the song. During the preparations for Christmas, he made hats made from dead rats and bats, Making Christmas (Song). He lastly appears at the end of the movie when all of the creatures are confused by the snow.