Amakusa Shōgo, Rurouni Kenshin Wiki

Amakusa Shōgo (天草 翔伍) is a young Japanese doctor and swordsman loosely based on an actual historical figure and the main antagonist of the Shimabara Arc. Originally born as Shogo Mutou (武藤 翔伍, Mutō Shōgo), he abandoned his family name to take up the title of "Amakusa Shiro", a Christian samurai who fought against the government centuries ago, to claim vengeance against who wronged his family and fellow Christians. He learned the Hiten Mitsurugi-ryū from his uncle, Nishida Hyōei, after they fled

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