Dairoku Hiba leads the Wild 7, a specialized motorcycle unit of reformed convicts authorized to eliminate criminals shielded by political or legal protections through extralegal means. His laconic, cynical demeanor reflects the unit's mandate, and he employs lethal force without hesitation.

A former outlaw with an undefined criminal past, Hiba coordinates the unit during high-stakes missions against armed robbers, terrorists, and organized crime syndicates. He utilizes customized motorcycles and heavy weaponry, including a rocket launcher-equipped sidecar, emphasizing pragmatism and efficiency over procedural constraints.

His narrative explores the tension between his role as a government-sanctioned enforcer and his status as a disposable asset, stemming from an institutional compromise. This dynamic surfaces during confrontations with adversaries embedded within governmental structures, forcing Hiba to navigate betrayals and shifting alliances. While his personal motivations receive limited exploration, his actions occasionally reveal underlying convictions about justice, particularly when unit members face existential threats.

The original manga serialized from 1969 to 1979 used techniques like rotating team members after deaths, sustaining tension through the possibility of Hiba's own demise; his ultimate fate remains unresolved. Adaptations, including the 2011 live-action film, maintain his core traits while updating settings to address contemporary issues like cyber-terrorism and government surveillance, retaining his functional leadership role without significant expansion of his backstory or relationships.

Across all official media, Hiba maintains consistent operational parameters and moral ambiguity, functioning as an archetype of extrajudicial enforcement rather than undergoing transformative personal development. His narrative purpose centers on executing the unit's mandate amid evolving criminal and political threats.