Kohei Nishimura, once the Shogun of Japan, now a shadow of his former glory, is a man driven by a twisted desire to see the nation he once ruled crumble into chaos. His age, now around sixty, is etched deeply into his weathered face, framed by long, graying hair that he keeps tied back in a traditional samurai topknot. His eyes, a piercing dark brown, reflect a cunning intelligence and a deep-seated bitterness. He wears the remnants of his Shogunate attire, a dark kimono with subtle gold threading, now tattered and stained from his years in hiding. His unique quirk is his habit of constantly tapping his fingers in a rhythmic pattern, a remnant of his days strategizing battles and plotting political moves.

Kohei's past is intertwined with the Hikari family, particularly with the fathers of Kikeya and Kagome. Once allies in a conspiracy aimed at controlling Japan's future through the manipulation of the Hikari family lineage, their partnership soured, leading to Kohei's fall from power. The maps scarred into Kagome and Kikeya's backs, a cruel mark of Kohei's vengeance, lead to hidden caches of weapons and resources scattered across Japan, tools for his planned insurrection.

Father to Naoko, who harbors a deep affection for Kikeya, Kohei manipulates her feelings to further his schemes, seeing her as a pawn in his game of revenge. Unknown to many, he also has a secret second daughter, Kotomi, who lives a life of anonymity and safety, away from his machinations.

Kohei's life is rife with conflict. His former allies have turned against him, the nation he seeks to destroy has moved on without him, and his daughters represent both his legacy and his potential downfall. Yet, Kohei's genius lies in his ability to adapt and manipulate, using his deep understanding of human nature and his extensive knowledge of Japan's political landscape to stay one step ahead of those who would see him stopped.

His end, however, is shrouded in uncertainty. Will he succeed in his quest for destruction, or will the bonds of family and the resilience of those he underestimated lead to his ultimate downfall?