Mitsuhide Kuroda, known as Ashura, practices Nada Shinyō-ryu, a martial art rivaling the protagonist’s Nadashinkage-ryu. A tragedy haunts his past: during a karate tournament, he unintentionally killed his friend Masakazu Naruse, an event that forged his commitment to technical pacifism and avoidance of lethal force. This philosophy drives him to guide others away from similar suffering, positioning him as both a cautionary figure and reluctant mentor.

Initially clashing with the protagonist through a charged handshake challenge that tests their martial resolve, Kuroda’s rivalry gradually shifts into a layered alliance. He offers strategic wisdom and restraint, yet his well-intentioned warnings occasionally spur the protagonist’s defiance. Their dynamic balances mutual respect with ideological friction, as Kuroda navigates his dual role as challenger and guardian.

His combat style prioritizes calculated precision over brutality, leveraging non-lethal tactics to disarm opponents without fatal harm. This contrasts starkly with the deadly potential of Nadashinkage-ryu. Despite his aversion to killing, his analytical mind allows him to adapt swiftly in battle, dissecting techniques and devising counters in real time. As he confronts his lingering guilt, he evolves into a mediator during conflicts, blending tactical insight with hard-earned empathy.

A subplot intertwines him with Takako Kawashima, whose interventions in his early clashes with the protagonist suggest a shared history marked by unspoken tensions. Though their connection remains enigmatic, it underscores Kuroda’s unresolved past. His influence endures beyond physical confrontations, shaping the protagonist’s understanding of power’s dangers and the fragile balance between strength and mercy.