Yomi

Yomi is a villain in the manga Riki-Oh. He is one of Four Emperors of Kokubu Prison and the leader of the west cell block.

Biography
Yomi, and the other Emperors (Kitamakura and Shiragami), are first introduced after Riki-Oh killed Narumi, one of the Four Emperors and leader of the north cell block. Yomi is an effeminate, but also ruthless and sadistic man, even as going far as killing a young boy named Asa by skinning him alive for revealing a greenhouse containing opium to Riki-Oh, and beheading a dog. He is also able to kill people by striking them in the chest with his palm, slowly stopping the victim's heart. After the Warden digs up Riki-Oh when he was buried alive for seven days, Yomi and Shiragami proceed to viciously torture Riki-Oh by smacking him around with a monkey wrench and stuffing a handful of razor blades into his mouth. After that scene, Yomi and Shiragami are not seen again. However, in the first OVA, Riki-Oh later battles Yomi and Yomi dies when the greenhouse is destroyed, burying him alive. In The Story of Ricky, Riki-Oh battles Yomi in the prison kitchen and Yomi is defeated by Riki-Oh after he severs Yomi's leg and breaks his arms to make sure that he could never kill again.

Trivia

 * Yomi is known as Rogan in The Story of Ricky. Additionally, he was portrayed by Yukari Ôshima and his voice was dubbed by a male actor.
 * Yomi, along with Shiragami, was not seen again after the torture scene in the manga, leaving his fate unknown.