Baby 5

Baby 5 is the alias of a member of the Happo Navy who is married to Sai, the Happo Navy's 13th leader. She is a former servant and assassin of the Donquixote Pirates serving as an officer in the Pica Army. Her real name has not been revealed. Due to her actions, she is a minor antagonist during the Punk Hazard Arc, and a supporting antagonist during the Dressrosa Arc, before becoming an ally of the Straw Hat Pirates after her engagement with Sai in the same Arc.