She is portrayed by Chiaki Kuriyama.
Gogo was a young associate of O-Ren Ishii and a severely disturbed 17-year-old Japanese schoolgirl who takes sadistic delight in killing. She was O-Ren's top assassin and personal bodyguard. Gogo's disturbed mind and vicious penchant for killing is displayed when she offers herself to a drunken man in a bar and then disembowels him.
Later on, she takes on Beatrix Kiddo when the latter has already slaughtered several of O-Ren Ishii's immediate guards at the House of Blue Leaves. Although The Bride gives her the opportunity to walk away, Gogo takes her on with a large meteor hammer with sharp blades hidden within it, almost overcoming the Bride by strangling her savagely with the chain. Out of all the enemies that the Bride comes up against, Gogo is the only one that almost kills The Bride in Kill Bill Volume 1. Eventually, Kiddo turns the table on Gogo by driving a broken chair leg studded with nails into her foot and, while she's distracted, drives the chair leg into the side of her head. As Gogo slowly dies, blood leaks from her eyes.