Kei was a ghoul of the 11th ward and the mother of Kouto. Aligned with Kazuichi Banjou during his time leading the ward, she took part in the doomed plan to break out of the 11th Ward Base and was killed by Yamori as leverage against Ken Kaneki.
Kei dressed in the standard garb worn by members of Aogiri Tree.
Little is documented about her temperament. She is defined chiefly by her ties to Banjou's circle and by her role as Kouto's mother.
Kei attended the Anti-Aogiri gathering where the ghouls loyal to Banjou mapped out their escape from the 11th Ward Base. When the breakout collapsed, Yamori killed her and her son as part of the torture inflicted on Kaneki. In the anime adaptation, she and Kouto were swapped out for the characters Shuu and Haru.

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Kei is a ghoul from the 11th ward and the mother of Kouto, aligned with Kazuichi Banjou during his time leading the ward's ghouls.
Kei attended the Anti-Aogiri meeting where Banjou's followers planned their escape from the 11th Ward Base, and when the breakout failed, Yamori killed her and her son Kouto as part of the torture inflicted on Ken Kaneki.
Kei's son is Kouto, and both mother and son were killed together by Yamori during the incident at the 11th Ward Base.
Kei was affiliated with the Anti-Aogiri group, the faction of 11th ward ghouls led by Kazuichi Banjou who tried to break away from Aogiri Tree's control.
In the anime adaptation, Kei and her son Kouto were replaced by different characters, Shuu and Haru, rather than appearing as themselves.
Looking for more on Kei? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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