OVA
Description
Tokuzo Sugiyama administers the privately owned Tokyo State Prison, typically addressed by his title. He manages daily operations in the warden's absence, deploying four powerful inmates called the Four Emperors to enforce order, reflecting his pragmatic but harsh management.

Sugiyama lacks his left hand and left eyeball, injuries from past prisoner riots. He employs a functional metal hook as a prosthetic, using it to eat and impale inmates. His empty eye socket holds a removable prosthetic eyeball that stores mints or glass shards for combat. These modifications originate in trauma that fuels his paranoia and justifies his brutal treatment of prisoners.

Prisoner violence caused his disfigurement, and an inmate named Nachi saved his life. This history fuels his deep animosity toward inmates and absence of empathy. He employs extreme measures for control, such as flooding prison areas with quick-drying cement to destroy illegal opium crops and eliminate threats like Riki-Oh, disregarding casualties among inmates and guards.

Sugiyama manipulates the Four Emperors to enforce his rule, supplying weapons like glass shards to assassinate Riki-Oh. When they fail, he punishes them, publicly displaying the skinned tattooed back of Emperor Narumi as a warning. His cruelty includes humiliating captives, such as urinating on Riki-Oh during a burial punishment.

During Riki-Oh's rebellion, Sugiyama suffers significant trauma: choked until vomiting blood and having his head smashed through walls. His high pain tolerance keeps him conscious. He dies when the warden accidentally shoots him during a confrontation with Riki-Oh. In the manga, the bullet causes him to inflate abnormally and explode. The warden dismisses his pleas, blaming the prison rebellion on his failures.

In the OVA, Sugiyama lacks comedic traits and directly threatens Riki-Oh's adoptive parents. He personally conducts torture with electric machines. His death occurs when the warden's missed shot hits him during a hostage situation, resulting in a conventional gunshot demise.

The live-action film "Riki-Oh: The Story of Ricky" portrays him as "Assistant Warden Dan." This version omits his backstory of past mutilation, showing him lose his remaining eye and hand during Riki-Oh's rebellion. His death involves deliberate gunfire from the warden while prisoners use him as a human shield.