Caine Flaccano, alias Kepler, begins as a henchman in Gasback’s criminal gang during a bank heist two decades before the main narrative. Mid-robbery, he turns on Gasback, rallying fellow gang members to assassinate their leader and seize the loot. The plot unravels when Vash the Stampede intervenes, sparing Gasback’s life.

Twenty years later, Caine has transformed his stolen fortune into political power, reigning as mayor of Macca City. He erects a towering rotating statue in his image, modernizes the city’s power grid, and secures his legacy through infrastructure projects. His wealth and authority remain tethered to the heist’s spoils. To safeguard his prized monument, he takes out a 5 billion double-dollar insurance policy, drawing swarms of bounty hunters and agents as whispers of Gasback’s return spread.

Gasback resurfaces, systematically dismantling former traitors. After Gasback obliterates the enterprises of ex-allies Dorino and Mechio, Caine grants them refuge—only to later betray them during a tense standoff. He shoots both men non-lethally, framing them as scapegoats to pacify Gasback. The ploy backfires; Gasback vows to strip Caine of his wealth, city, and power plant.

In a final gambit, Caine launches a missile to obliterate Gasback and his allies, but Nicholas D. Wolfwood intercepts the attack. Defeated, Caine is arrested alongside Gasback and former comrades, his empire collapsing under the weight of his treachery. His trajectory—from calculating criminal to corrupt politician—highlights a life governed by ruthless self-interest, where every choice prioritizes survival over morality, cementing his legacy as a pragmatist undone by greed.