Yamanbagiri Kunihiro, an uchigatana forged as a replica of the divine "Yamanbagiri," carries the weight of his imitative origins. Crafted by an admirer of the original blade, he battles an enduring inferiority complex, seeing himself as a shadow rather than a true creation. To deflect comparisons, he adopts a deliberately disheveled appearance and deflects praise, interpreting admiration as implicit reminders of his unoriginality. Despite this, his formidable combat skills and latent leadership qualities earn him command of the citadel’s First Unit—a role his self-doubt complicates, sparking reluctance and internal conflict when confronting responsibilities.

His journey interrogates identity and self-worth. After a pivotal failure, he resigns as the Saniwa’s attendant, unable to align his perceived flaws with external demands. This decision is revisited in a prequel film where he participates in the Bitchu Takamatsu Castle mission, hinting at tentative acceptance of his role. Interactions with figures tied to Oda Nobunaga trace his evolution from reticence to guarded acknowledgment of his strengths, even as doubts linger.

Media portrayals underscore the paradox of his existence: as the sole Kotou-style blade by Kunihiro, he fiercely defends his status as his creator’s masterpiece while rejecting labels that erase his individuality. Collaborative narratives, including a crossover symbolically pairing him with King Ghidorah, amplify themes of resilience and layered identity.

Design and story intertwine vulnerability with competence. His tattered cloak visually embodies self-imposed obscurity, yet battle prowess and tactical skill betray his hidden capabilities. Narrative arcs—appointment as leader, demotion, and eventual reinstatement—mirror a cyclical path toward self-acceptance, balancing fragility with quiet resolve.