Suke Banji emerges as a juvenile delinquent fueled by a volatile temperament and propensity for violence, traits inherited from his parents. His family undergoes constant relocations triggered by destructive behavior from both him and his father, leading to expulsions from communities or job terminations. Notably, his mother conceived him during early adolescence in junior high school, contributing to unconventional family dynamics.

Banji’s central predicament stems from attending school disguised as a female after a uniform mix-up orchestrated by his father. The institution is not exclusively all-girls. He adopts the female alias "Sukeban"—denoting a female gang leader—to conceal his biological gender while navigating this environment. His motivations for sustaining the disguise include evading humiliation and exploiting romantic opportunities with female classmates who perceive him as female.

He displays overtly lecherous behavior, frequently attempting inappropriate physical contact with female characters under his feminine guise. Academically disinterested, he compensates with combative proficiency, routinely engaging rivals like the specialized "Pantyhose Brigade" in physical confrontations. An uncomfortable subplot hints at potential sexual tension with his mother through suggestive interactions, compounded by his father’s concerns their close age proximity could foster mutual attraction.

Across adaptations—including the original 1974-1976 manga and 1992 OVA—Banji’s character development remains minimal. Narrative conflicts such as mysterious assassins monitoring his actions or the unresolved significance of his pendant lack conclusive resolution. The 1992 and 2006 live-action films adapt the core premise without introducing substantive evolution beyond his established archetype.