Baby 5 is a member of Don Quixote Family who ate the Arms-Arms Fruit.
Baby 5 is an antagonist in the One Piece series that was created by Eiichiro Oda. The series first began serialization in Weekly Shōnen Jump on August 4, 1997. She would later appear in the Punk Hazard Arc that began in Volume 66.
Her first appearance was in One Piece Volume 69 CH. 682 "Mastermind", and her first anime appearance was in One Piece - Episode 608 "A Mastermind Underground! Doflamingo Makes His Move!". Her character in the Japanese series is voiced by Rina Satō, and the U.S. dub produced by FUNimation has yet to announce a voice actress.
Despite attacking him earlier that same day, Doflamingo had ordered Baby 5 and Buffalo to travel to Punk Hazard to retrieve Caesar Clown as he was under attack from Straw Hat Luffy and Trafalgar Law. As they arrived, they were met at the shore by the General Franky, who shot at them on sight. Baby 5 and Buffalo struggled to even scratch the robot. As soon as she pierced its armor, Franky shot them away with a powerful energy cannon. Just as they gained their footing again, Law arrived with Luffy, his crew, and the Marine G-5. Rather than fight, they grabbed Caesar to run. They nearly got away until Nami shot them down with a bolt of lightning.
As they were captured, Law used his powers to cut off their head and led them adrift with a transponder snail for whoever found them. They were discovered by Donflamingo himself, and he talked to Law, who was blackmailing Doflamingo to quit the Seven Warlords. Doflamingo then returned Baby 5 and Buffalo's heads back tot heir bodies on Punk Hazard. They returned to Dressrosa as Kuzan appeared to stop Doflamingo's interrogation of Vice-Admiral Smoker.
Back at the royal palace, Doflamingo asked her to find Trebol and send him to bring what he was keeping.
Baby 5 has eaten the Arms-Arms Fruit (ブキブキの実, Buki Buki no Mi) to make her a Full-body Weapon Human (全身武器人間, Zenshin Buki Ningen). With this power, Baby 5 can transform her own body into a weapon of any kind. This is a process she calls "Armsmorphosis" (武器変貌（ブキモルフォーゼ） Bukimorufōze). Even while transformed as a missile and exploding, her body will reform from the shrapnel.