A mischievous supernatural being found in the folklore of many primitive people; sometimes distinguished by prodigious biological drives and exaggerated bodily parts WordNet 3.0 & Open English WordNet

In mythology and the study of folklore and religion, a trickster is a character in a story who exhibits a great degree of intellect or secret knowledge and uses it to play tricks or otherwise disobey normal rules and defy conventional behavior. Wikipedia

Literary archetype Wikidata

Any of numerous figures featuring in various mythologies and folk traditions, who use guile and secret knowledge to challenge authority and play tricks and pranks on others; any similar figure in literature. Wiktionary