Fujimoto Shuuji debuts as a charismatic, sociable delinquent leading the "Fujimoto Corps" gang at Shiratake High School, embodying the classic "yanki" protagonist archetype. His initial antagonism toward main character Ikedo Sadaharu manifests in actions like tripping him during class. Gradually, Fujimoto's relationship with Ikedo shifts from rivalry to friendship, with his gang accepting Ikedo as one of their own. Early storylines position Fujimoto centrally, focusing on conflicts and romantic subplots, though Ikedo increasingly takes pivotal roles in critical events. Fujimoto's leadership faces a test during the final arc when he capitulates to a rival school's extortion demands, contrasting Ikedo's defiance; Fujimoto achieves a minor victory in a side conflict while Ikedo confronts the primary antagonists.

Decades later in *Gorillaman 40*, Fujimoto resurfaces as a middle-aged family man, devoted to his idol-aspiring daughter Mayu. His life is violently disrupted when he confronts thugs occupying disabled parking spaces and harassing the elderly, resulting in a severe assault that prompts Ikedo's return. This portrayal emphasizes Fujimoto's shift to paternal normalcy. He attends a Shiratake High reunion during its cultural festival, filming Mayu's dance performance, highlighting his supportive parental role.