Mariabelle is an immortal human who serves as the assistant and secretary to Yuhi Shinatsuhiko, the god and district mayor of Sakurashin Town. She is the daughter of V Calvani F. Her appearance is characterized by long blonde hair, blue eyes, and a slender, well-proportioned build. She is almost always seen wearing various cosplay costumes and rarely displays any change in expression, contributing to an air of calm detachment. Despite this, she occasionally reveals a funny and clumsy side, such as when she becomes noticeably upset if she does not have Japanese food for breakfast. Yuhi's power as a god is rooted in her, making her existence essential to the stability of his authority. She is also an undead artificial human, which grants her the ability to recover from fatal wounds, as she cannot truly die. When her throat is irritated, she sometimes smokes medicinal cigarettes to soothe it. Her role in the story is primarily that of a supporting figure who assists Yuhi and appears in the background of events, though her immortality and connection to Yuhi's power make her a significant element in the supernatural framework of the series. She does not undergo notable personal development over the course of the narrative, remaining a consistent, enigmatic presence. Her key relationship is with Yuhi, whom she faithfully serves, and her lineage as the daughter of V Calvani F ties her to the broader lore of the setting.