Heshikiri Hasebe, an uchigatana forged by Hasebe Kunishige, bears a name stemming from a defining incident: his former master, Oda Nobunaga, wielded him to cut through a cabinet concealing a hidden servant. This deep historical bond with Nobunaga profoundly shapes him, leaving unresolved feelings about his service, particularly the experience of swift replacement and being gifted to one of Nobunaga's strategists.

He now channels fierce loyalty and devotion toward his current master, intensely desiring to be their favored sword, though he keeps this wish unspoken. This devotion manifests as an unwavering readiness to undertake any task, even what he calls "dirty work," to demonstrate his usefulness and commitment. However, this fixation on loyalty and service often translates into controlling or overbearing behavior towards others.

Within the citadel, he presents a stern demeanor and exhibits perfectionist tendencies. His unresolved emotions tied to Nobunaga contribute to his portrayal as psychologically complex, specifically noted for a controlling nature and deep-seated attachment to his past master. This complexity places him in tension, grappling between his historical legacy and his current role.

His background story and emotional conflicts surrounding Oda Nobunaga form the core of his narrative arc in the 2024 animated adaptation and its related theatrical film, where his history is explored alongside Yamanbagiri Kunihiro.