Rei Hino, known as Sailor Mars, embodies the Guardian of Flame and Passion in the present era. Her civilian life centers on serving as a shrine maiden at Hikawa Shrine with her grandfather, maintaining Shinto traditions through spiritual duties. This role provides innate supernatural gifts: psychic foresight, sacred flame divination, and exorcism of malevolent spirits using ofuda talismans. Her personality diverges between adaptations. The manga continuity, reflected in *Pretty Guardian Sailor Moon Eternal*, depicts her as reserved, tradition-bound, and initially mistrustful of men—a trait rooted in estrangement from her politician father and her mother's early death. This contrasts with the 1990s anime's more impulsive, romance-focused portrayal. The film *Eternal* emphasizes her manga-aligned solemnity while highlighting spiritual fortitude. During *Sailor Moon Eternal*'s solar eclipse crisis, Rei battles the Dead Moon Circus. Temporarily overseeing the shrine alone, she wavers over inheriting her grandfather's role. Antagonist PallaPalla exploits this doubt, imprisoning her in a Mirror House illusion where a younger Rei ridicules her shrine devotion and friendships. Cornered by energy-draining Lemures and unable to transform, Rei is aided by her crow companions Phobos and Deimos in humanoid form. They reignite her resolve by gifting the Mars Crystal and Mars Arrow, enabling her Super Sailor Mars transformation to escape the nightmare and defeat Dead Moon agent Tiger's Eye. Her later Eternal Sailor Mars upgrade—unlocked alongside fellow Guardians—features a V-neck choker, layered red-and-light-red skirt, extended ribbons, star brooch, white knee-high boots with gold-star details, and translucent sleeves. This evolution intensifies her pyrokinesis and precision combat. All media iterations anchor her powers in fire manipulation. Signature attacks include Akuryo Taisan (ofuda-based exorcism), Burning Mandala (concentric fire rings), Mars Snake Fire (flame serpent), and Mars Flame Sniper (archery-inspired fiery arrows). Transformations like her Super and Eternal forms amplify these abilities via items such as the Mars Crystal. Rei's background includes permanent residency at Hikawa Shrine after her father abandoned family for politics post her mother's death. Childhood companions Phobos and Deimos—later revealed as protectors from Mars' moons—remain her allies. A Silver Millennium-era vow of chastity as Princess Mars fuels her general romantic disinterest, though she briefly harbored unrequited feelings for her father's secretary, Kaidou, in a manga side story. Initially aloof toward fellow Guardians, she develops fierce loyalty, particularly to Sailor Moon. In manga and *Crystal*/*Eternal* narratives, she and Sailor Venus (Minako) share a close partnership as co-leaders of the Inner Guardians.