Sosuke Aizen (藍染 惣右介 Aizen Sōsuke) is a character and previously the main antagonist in the anime and manga series Bleach created by Tite Kubo. He is the captain of the 5th Division when he is first introduced, but later betrays the Soul Society and becomes the series' main antagonist until he is defeated by Ichigo Kurosaki and Kisuke Urahara. His former lieutenant is Momo Hinamori.
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