Jun Guevara

A sumo wrestler challenged Jun to a fight in the prison cafeteria, but Jun gave him a gun and kicked him in the groin. Jun challenged him to a sumo wrestling match in the prison sports hall and won.

Jun encounters three members of Mouth after defeating Iron Michael. At first, Jun distracts the opponent with urine and then uses a powerful uppercut to defeat them.

Jun Guevaru challenged Biscuit Oliva to a fight in the center of the prison. Jun endured some heavy blows from Oliva, but was ultimately defeated.

Jun Guevaru is a muscular young man with shoulder-length hair, barely resembling his real-life counterpart. He wears a headscarf; outside of prison, he wears military-green shirts and pants or a black sleeveless T-shirt; and in prison, the standard orange prisoner's uniform. In combat, he sometimes removes his headscarf and shirt, and after opening his flask of wind, he paints his face with war paint and dirt.

He is a former high-seas pirate who founded his own sovereign nation. Guevaru is one of two "free men" in the Arizona prison, along with Biscuit Oliva . He is known for his radical political philosophy, his anti-capitalist and, more specifically, anti-American stance (he is presumably imprisoned for breaking into George Bosch's home and threatening his family, after the latter considered using military intimidation tactics against Guevaru's nation), and his iron discipline. He is shown to be a very self-confident, and at times somewhat arrogant, man who never doubts his fighting abilities. Like Biscuit Oliva and Yuujirou Hanma , Guevaru is very prideful and would not allow himself to lose a fight.

He possesses a high intelligence and leadership skills, capable of single-handedly uniting a country and interfering with the US government on several occasions. Guevaru also maintains many of the same privileges as Oliva, as both the guards and the United States fear him. He also possesses exceptional knowledge of the natural sciences.

He can behave in ways that don't harm others. After their fight, Oliva mentions that he could have opened the main gate and left the prison whenever he wanted; not only would that undermine the guards' credibility, but it would also humiliate the security forces. Because of this, Jun prefers to do the guards a favor and dig his way to a quick escape to his homeland, which he ultimately does.

"El Segundo" is the second inmate to receive special treatment. While he doesn't have his own cell or library like Oliva, he does receive better food, and the guards pretend not to notice him when he steals cigarettes or breaks lines. Other inmates are shot without warning.