Bull King

Bull King is an antagonist of the classic novel Journey to the West and many of its adaptations. He also appears in Doraemon: Journey to the West as one of the main antagonists. He is one of the most popular Journey to the West villains in popular culture.

Past
The Bull King is a demonic bull who befriended and being the sworn brother of Sun Wukong. He eventually married Princess Iron Fan and gave birth to the Red Boy.

Role in the story
Bull King first appeared as a disguise of Sun Wukong to trick Red Boy into release Xuanzang. However, upon seeing that this "Bull King" does not remember his birthday, Red Boy deduced that he is a fake one and blew his cover as Wukong. Bull King later appeared when Xuanzang and his companions arrived at the Fire Mountain, having married to Princess Jade Face (a demonic fox). Upon learning that Wukong had took away the Iron Fan from his former wife Princess Iron Fan, Bull King angered and swore revenge. He later disguised as Zhu Bajie to trick Wukong into giving him the Iron Fan. Angered, Wukong, along with Zhu Bajie (who angered due to Bull King disguised as him) fight the Bull King, forced him to revert into his true form to attack them. However, with the help of the deities, Wukong managed to defeat the Bull King and get the Iron Fan.