Setsuna Kiryu

Kiryu Setsuna, also known as The Beautiful Beast, is a mysterious individual whose history is closely intertwined with Tokita Ohma's. He was the affiliated fighter for the Koyo Academy Group during the most recent Kengan Annihilation Tournament. Kiryu is an outwardly very polite and nice person, belying his true obsessive nature, which is entirely directed towards Tokita Ohma, with an irrational hatred towards Tokita Niko. While his obsession in Ohma initially appears to be sadomasochistic and sexual, as the series progresses it is revealed to be more religious: He worships Ohma as a god who will give him destruction, and loathes Niko as the devil who defiled his god.

He also appears to suffer a severe form of psychosis due to overusing the Fallen Demon technique, with the delusional belief that Niko is still alive and taking the form of different people and that he must kill Niko in every form he takes.

Kiryu is an effeminate-looking young man with gentle eyes and long black hair that falls down his back and frames his face in two long bangs. He has an incredibly defined musculature.

(Source: Kenganverse Wiki)