Raye Sailor Mars

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 (火川神社, Hikawa Jinja?, or Cherry Hill Temple in the English dub), and is shown to have an affinity with two crows who live there. It is revealed in the manga that as a child, they "told" her that their names are Phobos and Deimos (the same as Mars' two moons). 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, "down-to-earth" 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 frequently engages in petty arguments with Usagi, who she sees as immature, and although she becomes calmer as the series progresses, 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.