Eto Yoshimura

Eto is member and an executive of Aogiri Tree in Tokyo Ghoul who is infamous One-Eyed Owl who killed Kureo Mado's wife and Akira's mother. her human identity was Sen Takatsuki (高槻 泉, Takatsuki Sen), a best-selling horror novelist mentioned throughout the series which Ken Kanki is fan of the books and Rize Kamishiro read her books. in near ending of series it revealed that Eto is daughter of human named Ukina and Yoshimura, a ghoul owns Aniktu Cafe which Ken works. She and Tatara who watched the battle

Plot
She is born to Ukina and Yoshimura because Yoshimura forced killed Ukina who accpet her fate for sake of their daughter, Yoshimana sent his infant daughter to 24th ward and grew up in 24th Ward which she grew up by her hatred to order the survive by becoming a half-kakuja who fighting with CCG and killed Mado's wife. eventually Yoshimura takes her place to order to protect his daughter as One Eyed Ghoul from CCG

and Eto becoming a writer who wrote national bestsellers include Dear Kafka under name as Sen Takatsuki