Born into the Hitomebore lineage, Inaho Hitomebore inherits supernatural ties, most notably through her grandmother's significant bond with a vampire, granting her early access to occult knowledge and artifacts. She is driven by a singular, consuming obsession: achieving immortality to preserve her youth and beauty forever. This relentless pursuit leads her to seek the legendary O-Parts, ancient relics believed to bestow eternal life, regardless of the peril involved.

Her personality is marked by profound selfishness, stubbornness, and impulsive emotional outbursts. She routinely manipulates others—through guilt, flirtation, or feigned distress—especially the vampire Mosquiton, whom she resurrected via a blood contract binding him to her service. She consistently ignores his warnings about the dangers of their quest. Extreme vanity fuels violent reactions to perceived rivals like Mosquiton's former fiancée Camille, resulting in physical clashes and destruction. A strong materialistic streak defines her; she views mystical artifacts like the O-Parts or Dragon Balls primarily as lucrative commodities, focusing on their resale value during encounters like an auction.

Her relationship with Mosquiton is a volatile cycle. She revives him with her blood, temporarily restoring his full powers but often triggering violent rampages. When he threatens her during these frenzies, she repeatedly stakes him, reducing him to ashes, only to revive him again later—highlighting their toxic interdependence. Despite this, fierce possessiveness grips her, manifesting as intense jealousy towards other women, particularly Camille, escalating into physical fights and acts like sabotaging a ship. Her deep-seated fear of aging and death persists as an unresolved flaw, driving all her actions even when confronted with the O-Parts' darker truths, such as their use as sacrificial tools for cosmic entities.

While she occasionally cooperates with allies like Mosquiton's elemental guardians Honoo and Yuki, her leadership is egocentric; she delegates tasks to avoid personal effort and reacts petulantly when her shortcomings are exposed. Interactions in crossover scenarios, such as encountering childhood friend Ynagi at an auction, consistently reveal her transactional approach to relationships, prioritizing personal gain over emotional connection.