trickster

n. person who plays tricks; rogue, crook, swindler, cheat

In mythology, and in the study of folklore and religion, a trickster is a god, goddess, spirit, human, or anthropomorphic animal who plays pranks or otherwise disobeys normal rules and norms of behaviour.While the trickster crosses various cultural traditions, there are significant differences between tricksters in the traditions of many Indigenous peoples and those in the Euro-American tradition: "Many native traditions held clowns and tricksters as essential to any contact with the sacred. People could not pray until they had laughed, because laughter opens and frees from rigid preconception. Humans had to have tricksters within the most sacred ceremonies for fear that they forget the sacred comes through upset, reversal, surprise. The trickster in most native traditions is essential to creation, to birth".
See more at Wikipedia.org...

(n.)
One who tricks; a deceiver; a tricker; a cheat.
  

Noun
1. someone who plays practical jokes on others
(synonym) prankster, cut-up, tricker, hoaxer, practical joker
(hypernym) troublemaker, trouble maker, troubler, mischief-maker, bad hat
2. someone who leads you to believe something that is not true
(synonym) deceiver, cheat, cheater, beguiler, slicker
(hypernym) wrongdoer, offender
(hyponym) bluffer, four-flusher
3. a mischevous supernatural being found in the folklore of many primitive people; sometimes distinguished by prodigious biological drives and exaggerated bodily parts
(hypernym) spiritual being, supernatural being