Gogo Yubari
https://quentin-tarantino.fandom.com/wiki/Gogo_Yubari "The young girl in the schoolgirl uniform is O-Ren's personal bodyguard, 17-year-old Gogo Yubari. Gogo may be young, but what she lacks in age, she makes up for in madness." ― Beatrix Kiddo describing Gogo Yubari.[source]
Gogo Yubari was the secondary antagonist in Quentin Tarantino's 4th film, Kill Bill: Volume 1. She was a sadistic and ultraviolent schoolgirl and a young associate of O-Ren Ishii.
She was portrayed by Chiaki Kuriyama.
