Eto Yoshimura is a ghoul and is the founding leader and ruler of the Aogiri Tree. She is the infamous One-Eyed Owl who killed Kureo Mado's wife and Akira's mother. Her human identity is Sen Takatsuki.

Eto Yoshimura is the most infamous "Owl" character in Tokyo Ghoul. One of the most powerful ghouls ever, Eto is the miraculous daughter of Yoshimura and Ukina, conceived against all odds, abandoned by her parents and then growing up hating the world.