Jakk

 is a strange-looking monster with a pumpkin head and wearing a tuxedo. Nobody knows where it came from, however according to the monster scholars it might be a familiar of a demon. A spooky, pumpkin-headed monster that dresses in a slick formal suit. It's been known to invade Prontera on St. Hallow's Eve in the past.

There is also a version that comes out during the Christmas season.

Trivia

 * Jakk is inspired by the jack o' lantern.