The Warden is the chairman of the Kokubu Prison. Is one of the main antagonists in the manga . He appeared in the manga, OVA , and the live-action film, .
The Warden is the corrupt chairman of the maximum security Kokubu Prison. He was first introduced when he returns from his vacation in Hawaii, with his spoiled, overweight son Manabu. After many failed attempts to kill Riki-Oh Saiga, the Warden challenges him to a battle to the death, which ends with Riki-Oh throwing the mutated Warden into a meat grinder, costing him his legs. Before he dies, he tells Riki-Oh about his long lost brother Nachi's wherabouts.
In the OVA, the Warden suffers a different fate; he does not transform into a monster, and instead of being confronted in the prison kitchen, Riki-Oh confronts him in his office. The Warden convinces Riki-Oh to join him, but in turn, Riki-Oh "punches" the Warden in the face and walks away. The Warden then pleads Riki-Oh to come back, then his face is suddenly ruptured and a large amount of blood gushes out of his face and dies in a pool of his blood, due to the impact of Riki-Oh's "punch".
In , which was based on the first chapters of the manga, the Warden is the primary antagonist of the film. His personality is similar to the one in the manga, but is apparently prone to heart attacks and requires medicine. His fate is similar as well, but Riki-Oh/Ricky Ho shoves his entire body into the grinder, leaving only the Warden's head.
The warden is a short elderly man with dark tinted glasses and a usually wears a bowler hat.
The warden is a cruel man who believes power is everything in this world and has a lust for authority and influence. As mentioned by Administrator Sugiyama Tokuzou: "the Warden is "less forgiving" than himself."
The warden is seen wielding a gun that is loaded with highly compressed gas bullets that cause any person shot with them to swell up and explode. He is also extremely fast, able to dodge Riki-Oh's punch an instant before it connects.He is also a practitioner of Naike Kenpou, which he used to shrink his body and muscles, his true form is a large muscular man. In this form he has superhuman strength and is able to make his body akin to rubber, allowing him to absorb attack damage or retract body parts into his body.
In the manga and OVA, the Warden is depicted as a short man, while in the film, he is noticeably taller.
In the manga, Manabu is last seen during the part where the Warden orders the prisoners to bury Riki-Oh. In the OVA, he does not appear at all, and in the film, Manabu is seen with his father in the prison kitchen, and is even tricked by a prisoner into freeing some of them, angering the Warden.
His real name is never revealed.