Rei Hino serves as a shrine maiden at Tokyo's Hikawa Shrine alongside her grandfather, the head priest. Her mother's death during her childhood caused estrangement from her politician father, who favored his career over family, fostering her distrust of men in the manga and live-action versions. The 90s anime leaves her family background unexplored but depicts her living with her grandfather and interacting with Yuuichirou Kumada, a shrine helper who develops feelings for her. Rei attends the elite T·A Private Girls' Academy, a Catholic school, marked by its distinctive uniform. Innate supernatural abilities, honed through her miko duties, include precognition, pyromancy, evil presence detection, and using ofuda for exorcisms; these powers sometimes isolate her socially. This civilian life contrasts sharply with her identity as Sailor Mars, the reincarnated Guardian of Mars awakened to protect Earth. Her fire-based attacks are Fire Soul, Burning Mandala, and Mars Flame Sniper. Enhanced forms like Super Sailor Mars and Eternal Sailor Mars amplify these abilities and modify her uniform with features like translucent shoulder pads or star-themed accessories. Her personality diverges across adaptations. The manga and *Sailor Moon Crystal* portray her as reserved, traditional, stoic, and disdainful of modern romance due to her father's neglect; she shares a close bond with Minako Aino. The 90s anime reimagines her as hot-headed, ambitious, and occasionally boy-crazy, frequently clashing with Usagi Tsukino while also sharing a deep, sisterly bond. Despite arguments, Rei demonstrates fierce loyalty to Usagi, sacrificing herself in multiple story arcs. The live-action series blends these traits, showing her initially aloof but gradually warming to the Sailor Guardians. Romantic interests also vary. The manga explores unrequited feelings for her father's secretary, Kaidou, in *Casablanca Memories*. The 90s anime briefly pairs her with Mamoru Chiba and implies tension with Yuuichirou. All versions emphasize her eventual disinterest in romance, particularly after recalling a past-life vow of chastity to Princess Serenity during the Dead Moon Circus arc. Key development occurs through her interactions with the Sailor Guardians. Rei evolves from a solitary individual into a committed team member, recognizing Usagi's leadership despite initial doubts. Her spiritual role remains central, with fire symbolizing both her destructive power and purifying resolve. In the far future, she reappears as Princess Mars in the Silver Millennium and as a mother in the *Parallel Sailor Moon* story.