Sailor Moon Character Overviews:
Sailor Mars
In the anime, her name is Hino Rei. Her friends call her Rei-chan. I like her the best after Serena. She has a very firey temper and thinks Serena is a slacker. She is a Shinto priestess at her grandfather's temple. She reads the future through fire. She is in love with Darien for awhile, but when she learns that he and Serena are destined to be together, she backs off. She is Sailor Mars, and her costume is red.
Raye is a very complex character. You really must try and see into her heart and understand her because if you don't, she simply becomes mean and cranky. Early in the series, she believes that she would make a much better leader than Serena, and she's right. Serena is a whiny crybaby in those episodes. But she is still the Moon Princess, and when Raye sees that she pushes aside her own obvious jealousy and shock in order to protect Princess Serena from the Negaverse. She is really very admirable, because she is clearly struggling with the fact that Serena is the Princess and she is not. Despite all her petty arguing with Serena, she truly cares for her deeply, like a sister.
Her mother dided when she was small, and her father is a busy politician. Raye doesn't like him very much, and so she lives with her mother's father, Grandpa Hino, a sensei at the Cherry Hill Temple. She is able to draw extra power from her Shino "anti-Evil" charms while she is Sailor Mars.
She eventually falls in love with a helper at her temple, named Chad. Raye also has two pet crows named Phobos and Deimos. If you'll recall, these are the names of the two moons of the planet Mars. Phobos and Deimos are changed into human girl Sailors in the Manga.
Also, in the Manga, Rei is classy and sophisticated, and closest to Minako/Sailorvenus. IN the anime, Raye is often immature, short tempered and egotistical. But we still love her! :)
Worth Noting: All the Sailor Scouts were princesses of their respective planets during the Silver Millenium. Sailor Mars wouold have been the Princess of Mars, in addition to being the sworn protector of the Moon Princess.