She is a servant and assassin of the Donquixote Pirates serving as an officer in the Pica Army. Her real name has not been revealed. Baby 5 is unable to turn down any favors asked of her. She seems delighted at the notion that she is needed whenever she is asked to do something, even when someone explains that she needs to stop granting favors to everyone she meets, she always ends up overwhelmed by the feeling of being needed.

Spoiler

That behavior is due to her Having been abandoned by her mother when she was a child, who called her useless before parting and leaving her alone.

Spoiler

Although they initially fought against each other at Dressrosa, Baby 5 fell in love with Don Sai. In his opposition to her tendency to do whatever is asked of her, he told her to kill herself, which she almost did but he was quick to stop her. Lao G challenged Sai in an attempt to thwart the supposed proposal. Realizing she had spent her life feeling useless, he vowed to make her his wife if he won, much to her joy. He defeated Lao G and Baby 5 conceded, sealing their engagement, becoming a member of the Chinjao Family and consequently becoming a member of the Straw Hat Grand Fleet