Rei Hino serves as a shrine maiden at Tokyo's Hikawa Shrine alongside her grandfather, the head priest. Her mother's early death and her emotionally distant politician father shaped her low opinion of men. She attends the exclusive T*A Girls' School, separate from fellow Guardians. Two crows, Phobos and Deimos, are her constant companions; in the manga, they originate from the Silver Millennium, named after the moons of Mars. Rei possesses innate psychic abilities: precognition through fire scrying, sensing evil, and exorcising spirits with ofuda, though these powers lack perfect reliability. Her civilian duties encompass shrine responsibilities, meditation, and archery practice. As Sailor Mars, Guardian of Flame and Passion, she commands fire-based powers linked to Mars. Transforming with phrases like "Mars Power, Make Up!" and its upgrades ("Mars Crystal Power, Make Up!"), her attacks include Fire Soul (fingertip fireballs), Fire Soul Bird (phoenix-shaped fire), Burning Mandala (fire rings), and Mars Snake Fire (fire serpent). Later, she wields the Mars Flame Sniper with a flame bow and arrow. Her uniform features red and violet accents, a red choker, a red-gem tiara, and red heels. Upgrades like Super Sailor Mars add a heart brooch, a yellow star on her choker, and translucent shoulder pads. Eternal Sailor Mars adopts a two-layered skirt, light red elements, and white knee-high boots. Rei's personality differs across adaptations. The manga depicts her as stoic, traditional, and distrustful of men, stemming from her father's neglect and a broken bond with his secretary, Kaidou. She initially scorns romance, influenced by a past-life vow of chastity to Princess Serenity. Her interactions are formal, yet she shares a close bond with Minako Aino. The 90s anime portrays her as hot-tempered, boy-crazy, and frequently arguing with Usagi Tsukino, though their deep friendship and loyalty endure. This Rei briefly dates Mamoru Chiba and shows intermittent interest in her grandfather's apprentice, Yuichiro Kumada. The live-action series blends these traits, presenting her as serious yet volatile, pursuing an idol career as "Mars Reiko." All versions highlight her fierce loyalty to the Sailor Guardians and her maturation into a dedicated protector. Her development spans key story arcs. Discovered second after Sailor Mercury in the Dark Kingdom arc, she sacrifices herself alongside fellow Inner Guardians to aid Sailor Moon against Queen Metalia, later reincarnated without memories. The Black Moon arc restores her memories to fight new threats. The Infinity arc's manga side-story "Casablanca Memories" explores her disillusionment with Kaidou. The Dream arc sees her confront insecurities about destiny and reaffirm her chastity vow. The Stars arc grants her the Eternal form for the final battle against Shadow Galactica. Her psychic abilities and spiritual insight consistently provide early warnings throughout these conflicts. Rei maintains complex relationships. She initially clashes with Usagi but grows to respect her leadership, fostering a sisterly bond in the anime. Minako remains her closest manga confidante. Her grandfather offers familial stability, while Yuichiro (anime) and Kaidou (manga) represent unfulfilled romantic paths. Phobos and Deimos act as spiritual companions, transforming into human allies during the manga Dream arc. Fire symbolizes her passion, purification, and destructive power. Her Shinto shrine duties emphasize spiritual discipline and the balance between earthly responsibilities and cosmic guardianship. Her evolution from a solitary, mistrustful individual to a committed team member underscores themes of loyalty and self-acceptance.