Hokuto Mizorogi is a supporting character from the narrative of Gekijōban Mononoke Dai-San-Shō: Hebigami. He is established as a priest associated with the faith practiced within the Ooku, the inner chambers of the imperial harem, and is known to have a ancestral connection to a figure named Mizorogisaku, who was deeply tied to the birth of the Ooku and the faith surrounding a entity known as Omizu-sama. Hokuto is a notable presence within the setting, distinguished by his unusual situation: he is a man who is frequently seen inside the otherwise strictly female domain of the Ooku. His appearance is often in the company of his young twin daughters, and his presence is one of the more enigmatic elements within the story.

In terms of personality and observable traits, Hokuto is presented as a quiet and observant figure. He does not have many spoken lines, yet his physical reactions and silent presence convey a sense of deep inner turmoil. For instance, he is shown expressing visible shock when a contaminated well, central to the Ooku's rituals, is ordered to be closed, suggesting his investment in the established order or perhaps a hidden dependency on it. His motivations seem to be intimately connected to his children. His persistent presence within the Ooku, to the point of bordering on a spectral fixture, implies a profound need to remain close to his daughters, potentially driven by a protective instinct or a more complex, possessive attachment. The nature of his existence itself is ambiguous, with the implication that he may be lingering beyond his natural life, sustained by the negative energy and secrets of the Ooku.

Within the role of the story, Hokuto serves as a subtle but persistent reminder of the deep-rooted history and unseen corruption permeating the Ooku. He is a witness to the events unfolding, and his reactions, particularly to the alteration of the well's use, hint at a disruption of a long-standing, possibly monstrous, cycle. His key relationships are primarily with his twin daughters, who act as a tether to the living world, and by extension, to the institution of the Ooku itself. His development is not marked by dramatic transformation but by a gradual revelation of his true nature and his historical weight as a remnant of the Ooku's past sins. He does not exhibit flashy combat abilities. Instead, his notable ability appears to be his persistence and his potential to influence events from the periphery, using his unique position and his bond with his daughters to remain anchored in a place where he might no rightfully belong, thereby blurring the line between the living and the mononoke he serves or perhaps embodies.