He led a band of monkeys, or ape-like creatures, who gave vital assistance to Rāma from the rescue of Sītā from Rāvaṇa's kingdom of Laṅkā. He's a image of toughness and loyalty, and is particularly patron of wrestlers. Hanuman is claimed to happen to be mischievous in his childhood, https://www.youtube.com/watch?v=ufkmD95y7fE