BB (ビィビィ, Byibyi?) is an Advanced AI originating from the Advanced AI Sakura Matou and the main antagonist of Fate/EXTRA CCC. She is the creator and Master of the Sakura Five in the Sakura Labyrinth. She is also a MoonCancer-class Servant summoned by Ritsuka Fujimaru in the Grand Orders of Fate/Grand Order. BB is a backup AI created by Sakura containing her feelings for Hakuno Kishinami. During the preliminaries, she, who had her freedom unleashed by the hands of Kiara Sessyoin, could not…
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