Sailor Mars is a fictional lead character in the Sailor Moon media franchise. Sailor Mars is the third Sailor Senshi to be discovered by Sailor Moon and the secondary leader of the Guardian Senshi after Sailor Venus. She possesses powers associated with fire, as well as psychic and spiritual ones.
Rei’s history is largely the same across the different versions of the story. She works as a miko or shrine maiden at the Hikawa Shrine, and is shown to have an affinity with two crows that live there. In the manga she is portrayed as calm, serious, and practical, distrusting most men and discouraging her friends from developing romantic relationships. In the other adaptations, though, her personality is quite different.
In the anime, Rei is fiery, boy-crazy, practical and ambitious, longing to one day become a singer, model, and voice actress envisioning herself as ultimately getting married. She is also greatly interested in pop culture and shows musical talent of her own, including playing the piano and guitar, singing, and composing all the songs for a school festival. Rei and Usagi have a very tempestuous relationship, and argue frequently. Though these arguments are usually petty, early in the series Rei tries to take Usagi’s role as Senshi Leader. Her loyalty to Usagi becomes much stronger later in the series, and affection replaces the earlier resentment. Although Rei becomes calmer as the series progresses, she remains somewhat more of a typical teenager than her manga counterpart. Anime Rei also tends to engage in long periods of sticking her tongue out at Usagi (who returns the favor), as a kind of running gag in their arguments.
