Tetsugyu, known as the "Iron Ox," serves as a towering presence within the International Police Organisation’s Experts of Justice, distinguished by unparalleled physical prowess and combat mastery. His hulking, muscular frame embodies his moniker, amplified by a brash, thunderous personality. A childhood marred by adversity culminated at age twelve when he fatally confronted his father, a Big Fire operative—a defining trauma that propelled him into the International Police Organisation, where his lethal talents solidified his position among the Experts of Justice.

Interpersonal bonds unveil hidden layers: he harbors unrequited affection for Ginrei, while his initial hostility toward Daisaku Kusama, the group’s idealistic youth, stems from both Ginrei’s favor and clashing temperaments. Gradually, recognition of unexpected common ground with Daisaku forges a grudging alliance rooted in respect.

In the Experts of Justice’s crusade against Big Fire, Tetsugyu assumes a cornerstone role. His ferocious combat skills and unyielding resolve prove instrumental in liberating hostages and challenging high-profile enemies. Though defined by loyalty to allies and battlefield dominance, glimpses of emotional vulnerability surface—subtle protectiveness toward Ginrei and an evolving camaraderie with Daisaku.

His arc intertwines reckoning with redemption, fractured bonds, and the tension between brute force and introspection. A blend of unrelenting strength and guarded sensitivity cements Tetsugyu as a multifaceted pillar of the narrative, balancing raw physicality and nuanced emotional undercurrents.