BB(ビィビィ, Byibyi?) is an Advanced AI originating from the Advanced AI Sakura Matou in 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. 1 Profile 1.1 Background 1.2 Appearance 1.3 Personality 1.4 Relationships 2 Role 2.1 Fate/EXTRA CCC 2.2 Fate/EXTRA CCC Fox Tail 2.3 Fate/Grand Order 2.3.1 Subspecies Singularity: SE.RA.PH 2.3.2 Summer Event: Servant★