Shiragami is a prisoner of Kokubu Prison and a member of the Four Emperors. He is the boss of the south block.
Shiragami, and the other Emperors (Kitamakura and Yomi), are first introduced after Riki- Oh killed Narumi, one of the Four Emperors and leader of the north cell block, Shiragami has the appearance of a short, elderly man. Despite this, he is a formidable foe who uses large needles as weapons to skewer his victims. He assists Yomi during his battle with Riki-Oh. However, Kitamakura interferes and throws a pitchfork behind Shiragami's head (strangely, he survives, but has the pitchfork stuck behind his head in later scenes). Later on, while Riki-Oh is buried underground, Yomi and Shiragami appear to prevent him from surviving his burial, with Yomi beheading a dog and Shiragami taking an organ from the dog and sticking it down Riki-Oh's breathing tube. After Riki-Oh survives the burial, 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 this, Yomi and Shiragami are not seen again. However, in The Story of Ricky, Shiragami, along with Yomi, battle Riki-Oh one final time in the prison kitchen. After Riki-Oh defeats Yomi, Shiragami attempts to flee, but the Warden shoots and kills him.
Shiragami appears as a dwarf, middle aged man. He has a fleshed face. He has short, blonde or gray hairs.
Shiragami is a sadistic psychopath.
Among Riki-Oh characters', Shiragami's skills are the most enigmatic. He is able to push thousands of needles out from his sleeves. Though he appears as a elderly and consummate man, he proves to be very strong and fast. He is able to approach Riki-Oh, tack Riki's arm to his chest with one of his needles, then leave, all with a great speed and agility. The most strange thing about Shiragami is that Kitamakura threw a pitchfork behind Shiragami's head, piercing him, and he survived with little indication of pain.