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An idealistic gunfighter who falls in love with the witch-gunslinger Kurohime.
A pure-hearted kid who was saved by Kurohime when he was a little boy. He was inspired by her act of heroism and became a gunman himself, calling his fighting style "The Superfast-Quadruple Guns" or "The Guns of Justice." Sometime after becoming a gunman, he runs into a little girl named Himeko and travels around the world with her. Himeko later turns out to be the master sorceress Kurohime who saved him years ago. He tries to use Zero's love for her to selfishly break her own curse and fight her own enemies, but it usually just backfires. Though she often uses him, Zero never stops loving her.
At one point during the series, Zero helps Kurohime fight and then kill Darkray, the God of Death, and ends up sacrificing himself in order to help her get to safety. Afterwords, Kurohime undertakes a journey to get him back to life, but the Earth Goddess Yashahime grows jealous of the love Zero shared with Kurohime. Yashahime resurrects Zero with Darkray's skull, turning him into "Dark Zero." Dark Zero then ends up fighting Kurohime, taking back his trademark blue scarf from her and destroying her memories of the old Zero one by one. However, he can't bring himself to finish off Kurohime or her last memory of the "good" Zero, and ends up leaving with Yashahime instead.