During his junior year at Rinne-Dō Junior High, Gamagōri was already an imposing figure, tall, broad-shouldered, and muscular for his age. At the time, he wore his jacket draped over his shoulders, sported red spiked bracelets in place of gauntlets, and had chin-length loose hair rather than his later slicked-back style.

It was during this period that Gamagōri first encountered Satsuki Kiryūin. He confronted two well-connected bullies, Hōjō and Imagawa, who, backed by their families’ power, had coerced a young boy into attempting suicide. Despite Gamagōri’s efforts, he was unable to save the boy from jumping, but Satsuki arrived and prevented his death with a “Kiryūin Deluxe Trampoline.” She then revealed she had already dismantled the bullies’ influence by buying out Hōjō’s father’s company and exposing Imagawa’s father’s corruption, leading to his arrest. After dispatching the delinquents with her katana, she declared her rule over the school. This was Gamagōri’s first introduction to Satsuki’s authority and conviction.

Sometime later, Gamagōri challenged Satsuki directly, resisting her so-called “tyranny” with a suit of steel armor hidden beneath his uniform. Though he fought with determination, Satsuki pierced the armor and defeated him. Yet even in defeat, Gamagōri refused to kneel, propping himself up with her scabbard to remain standing. His unyielding spirit impressed Satsuki, who recruited him to her cause. She instructed him to wait for two years, promising that she would create a school that would serve as her army. From that moment, the two developed a bond of mutual respect and loyalty.

Gamagōri was one of the earliest recruits to Satsuki’s side, alongside Nonon Jakuzure, and is implied to have joined before Uzu Sanageyama and Hōka Inumuta. After graduating from junior high, he postponed his own education for two years, remaining true to his vow. When Satsuki founded Honnōji Academy, he enrolled with her and became her trusted “Impenetrable Shield,” eventually rising as one of the Elite Four.

Gamagōri is an exceptionally tall and muscular young man with a broad, imposing frame. He has a darker complexion, short blond hair, and thick, prominent eyebrows. His ears are pierced with small gold earrings set into his enlarged earlobes, adding to his distinct look.

He is most often seen wearing his Three-Star Goku Uniform, which accentuates his already formidable physique. For dramatic and comedic effect throughout the series, Gamagōri is occasionally depicted as a literal giant, towering over the rest of the cast. His size is often exaggerated in proportion to his emotions, with his stature seemingly growing or shrinking depending on his mood or the tone of the scene.

Among the Elite Four, Gamagōri is the most demonstrably loyal to Satsuki Kiryūin, treating her commands with absolute devotion and serving as her right hand within the Student Council. Stern and uncompromising, he embodies the authority of the Disciplinary Committee, showing no tolerance for disobedience or disorder. He frequently shouts his declarations at full volume, especially when confronting rule-breakers or correcting his more laid-back colleagues. For Gamagōri, law, hierarchy, and Satsuki’s authority represent the highest ideals, and he enforces them with unflinching conviction.

As chairman of the Disciplinary Committee, Gamagōri relies heavily on intimidation, and he has been known to display extreme measures against offenders, with rumors circulating that he executes violators as public warnings. Despite this severity, he is also protective of innocents and does not extend punishment to those who have committed no wrongdoing. This is illustrated when he assists Ryūko Matoi and Mako Mankanshoku by offering them a ride after their vehicle broke down, reflecting his sense of duty toward those in need.

Gamagōri possesses an unusual masochistic streak, particularly evident when donning his Shackle Regalia, where he revels in the pain inflicted upon him during combat. He often frames his enjoyment of pain in exaggerated, theatrical declarations. Similarly, he shows little embarrassment about nudity, even continuing to go about in only undergarments after losing his Goku Uniform in battle.

Despite his intimidating presence, Gamagōri is a deeply honorable figure defined by personal resolve. During his youth, he resisted Satsuki’s authority when she annexed his school, refusing to kneel even after defeat. Later, after being bested by Ryūko, he attempted to commit seppuku to atone for his failure, though Satsuki intervened and ordered him to endure instead. This moment underscores both his rigid code of honor and the depth of his loyalty to Satsuki’s cause.

Natural Capabilities

Superhuman Strength
Gamagōri possesses immense physical power, far exceeding that of ordinary humans and even rivaling students in Goku Uniforms. His strength allows him to easily subdue multiple opponents without relying on his own uniform. Even when stripped of it, he demonstrates enough raw force to grapple barehanded with a massive COVERS monster. His endurance and tolerance for pain are equally remarkable, enabling him to withstand extreme punishment and continue fighting.

Satsuki Kiryūin
Gamagōri has pledged absolute loyalty to Satsuki, serving as her enforcer and “impenetrable shield.” His actions and decisions consistently center around carrying out her will, and he never hesitates to follow her commands. His devotion to her is further emphasized by his decision to delay his own education for two years so that he could enroll and graduate alongside her.

Student Council’s Elite Four
Within the Elite Four, Gamagōri maintains a strict and authoritarian attitude, often acting as the disciplinarian of the group. This is particularly evident in his relationship with Uzu Sanageyama, whom he punished with whipping after Uzu refused to acknowledge his defeat against Ryūko Matoi. Despite this rigidity, he shares a strong sense of camaraderie with the other members and serves as a stabilizing force within the council.

Mako Mankanshoku
Gamagōri’s interactions with Mako evolved significantly over the course of the series. Initially, he regarded her as an ordinary No-Star student, but through repeated encounters he came to respect her determination and courage. Their rivalry reflects their allegiance to opposing sides, Satsuki and Ryūko respectively but Gamagōri refrained from harming her directly, even during tense confrontations such as the stand-off over Ryūko’s Scissor Blade during the Ōsaka Raid Trip. He has shown deep concern for Mako’s safety, particularly during Ragyō’s assault on Honnōji, where he vowed to her family that he would protect her. These gestures suggest that Gamagōri harbors romantic feelings for her.