Rei Hino serves as a teenage miko at Tokyo's Hikawa Shrine, residing there with her grandfather. Her mother's early death and the absence of her prominent politician father fuel a general mistrust of men and contribute to her reserved, serious demeanor in the manga and related media, contrasting with the 1990s anime's portrayal of a more hot-tempered, occasionally boy-crazy personality. Across all versions, she possesses innate psychic abilities like precognition, evil presence detection, and pyromancy, which she hones through fire-reading rituals. Her long black hair with purple undertones and violet eyes are consistent, as is her distinctive uniform from the private Catholic T.A. Girls' Academy. Transforming into Sailor Mars with phrases like "Mars Power, Make Up!" or "Mars Crystal Power, Make Up!", her powers center on fire manipulation and spiritual purification. Key attacks include "Akuryo Taisan" (exorcism via ofuda charms), "Burning Mandala" (rings of fire), "Mars Snake Fire" (fire-construct snakes), and "Mars Flame Sniper" (a flame arrow shot using a bow, reflecting her archery skills). Her classic uniform features red and violet accents, a red choker, and high heels. Upgraded forms alter her attire: Super Sailor Mars gains a heart-shaped brooch and translucent shoulder pads, while Eternal Sailor Mars (achieved in the manga and "Sailor Moon Eternal") adopts a V-shaped choker, layered skirt, light-red back bow, white knee-high boots with star embellishments, and elongated gloves. Her development varies by adaptation. The manga depicts her as stoic, disdainful of modern romance, and closely bonded with Minako Aino (Sailor Venus). The side story "Casablanca Memories" reveals her unrequited feelings for her father’s secretary, Kaido, solidifying her disillusionment. The 1990s anime shows frequent arguments with Usagi Tsukino (Sailor Moon), though deep mutual loyalty persists; here, she briefly dates Mamoru Chiba and later develops tentative feelings for shrine assistant Yuuichiro Kumada. The live-action series (PGSM) aligns more with the manga's aloofness but adds a subplot where she reluctantly becomes the idol "Reiko Mars." In "Sailor Moon Eternal," adapting the Dream arc, Rei confronts nightmares from the Dead Moon Circus. These illusions taunt her about her future, suggesting marrying into wealth is her only path to happiness. She overcomes this by reaffirming her dedication to her priestess duties and Sailor Guardian identity, recalling a vow of chastity sworn to Princess Serenity in her past life, solidifying her disinterest in romance. During the climax, she and the other Guardians achieve their Eternal forms through Neo-Queen Serenity’s power, enhancing their abilities to defeat Queen Nehelenia. Her past life as Princess Mars during the Silver Millennium is explored across media. She resided in Phobos and Deimos Castle, protecting Princess Serenity alongside fellow Guardians. This history explains her reincarnation in 20th-century Tokyo and her psychic connection to her guardian crows, Phobos and Deimos. In Crystal Tokyo's future, she serves as a Barrier Maiden, helping maintain the city’s protective fields. The spin-off manga "Parallel Sailor Moon" depicts an alternate future where she marries a priest and has a daughter named Rei. Relationships highlight her loyalty despite differing dynamics. With Usagi, their anime bond is contentious yet profound, Rei often being the first to comfort or defend her. In the manga and "Crystal," Minako shares a closer friendship with Rei, rooted in mutual respect and leadership roles. Her familial interactions are primarily with her grandfather, with occasional tension over shrine duties. Supernatural elements like fire-reading and ofuda usage remain integral, emphasizing her dual role as spiritual guardian and warrior.