Tenkou  

In the story "Fushigi Yuugi," Tenkou is a powerful and evil king who leads the Shitennou (the Four Heaven Kings). He possesses immense strength, surpassing even that of Nakago, his former servant. Tenkou sees himself as a god and aims to acquire the ultimate power known as "Shi Jin Ten Chi Sho." His goal is to rule both the book world and reality. Despite being merciless and cruel, he has no qualms about killing people without hesitation or remorse, and exerts complete control over others, compelling them to recognize his superiority.