Vibora heads the corporation Kiddy Kastle, aiming to raze Treasure Town and replace it with an amusement park. This goal embodies conflicts of gentrification and modernization versus established urban life. Preferring strategic manipulation to direct confrontation, he deploys three enhanced assassins—Dragon, Butterfly, and Tiger—endowed with near-superhuman flight and durability to eliminate resistance, including the orphan protagonists Black and White.

Vibora leverages yakuza networks to enforce his agenda, notably coercing underling Kimura into murdering his own mentor, Suzuki, to remove rivals. Though his assassins possess extraordinary abilities, Vibora himself exhibits no supernatural traits. His actions culminate in assassination by Kimura, who rebels after being manipulated into prior killings. This occurs during Kimura's attempt to flee Treasure Town with his pregnant wife.

Vibora's narrative arc concludes without further development or exploration of his background beyond driving the core conflict. No expanded backstory or additional appearances exist in spin-offs, OVAs, or other official media beyond the core manga and film. Symbolically, he embodies corporate greed eroding traditional urban landscapes, contrasting the protagonists' connection to the city's organic chaos. His demise resolves the immediate threat but leaves broader systemic urban development conflicts unresolved.