Joker operates as a member of the Hell’s Wind motorcycle gang during the "Hell’s Wind" arc, joining raids on Hope Town—a community struggling to recover after the Great Kanto Hellquake. The gang terrorizes survivors, abducting women and destroying morale. Joker wields a large knife during these assaults, notably slicing away a teacher’s clothing to humiliate and intimidate, a tactic highlighting the gang’s fusion of physical brutality and psychological domination.

When the gang retreats following an initial clash, Joker stays behind to torment Jun, a survivor infiltrating their base to rescue a kidnapped woman. He methodically cuts her with his blade, etching permanent scars into her flesh. This deliberate cruelty reinforces Hell’s Wind’s strategy of enforcing control through fear and pain.

In the anime adaptation, Violence Jack ends Joker’s reign during the final battle, hurling a knife that decapitates him, severs his legs, and cleaves his motorcycle before crushing his skull. The manga alters his methods: Joker tortures Jun with whips and fire instead of knives, and Hell’s Wind’s narrative lacks any link to the Slum King.

Officially, Joker exists solely as a secondary antagonist within this arc, devoid of expanded backstory or motivations. His role exemplifies the oppressive chaos plaguing the post-apocalyptic world, with no subsequent appearances or deeper exploration in other media.