|Voice Actress|| Nakagawa Akira (Japanese)
Amanda Goodman (English)
Keiko Sonoda is one of Nanami's three "stooges," the other two being Aiko Wakia and Yuuko Oose. She is particularly aggressive towards Anthy Himemiya, often at the direction of Nanami herself. However, her "friendship" with Nanami is flawed by the fact that Keiko secretly loves Touga, Nanami's brother. She fought with Utena as a Black Rose Duelist with a sword she pulled out of Touga.
She does not appear in the film or in the manga.