The Azure Lion was a demon, and one of the former sworn brothers of Monkey King, whose main goal was to bring peace to the mortal realm by killing the Jade Emperor. Years after his cause was ruined by his fail attempt to take over the Celestial Realm. Seeing the Mortal Realm and its people suffer, Azure Lion served the Jade Emperor as a Celestial Warrior to protect them. He encountered two other demons, Peng and Yellowtusk, and their friendship blossomed over a delightful feast.