Doji (大道寺, Daidouji) is a primary antagonist in every arc of the Metal Fight Beyblade manga. Despite starting as Ryuuga's subordinate in the Dark Nebula, he has important relations to every arc's villain until he's finally shown to be the puppeteer behind the last antagonist in Zero G. Over the duration of the manga, he grows more and more twisted and simultaneously replaces more and more of his body with robotic parts.