Shigyou, Ren

Ren is a new student at the high school that Miaka and Yui attend. He is a freshman, the same age as them, and extremely popular at school. He runs for school president against Yui and becomes the leader of a group of students who threaten Miaka and Taka. Ren has the ability to control people's minds, detesting and taking advantage of weak people who allow him to manipulate them. He dislikes and is jealous of the miracle that allowed Miaka and Taka to be together. Ren is the first Shitennou for Tenkou, who aided him in acquiring his powers and allowing him to travel between the two worlds.
From Fushigi Yuugi - The Fire of Suzaku's Wings