Eto Yoshimura is a short, mid-twenties woman with green hair and a sleepy or curious expression. She is noted for her beauty and sharp intuition. As the founding leader of Aogiri Tree, she has a sadistic personality and finds joy in others' suffering. Eto also has a dual identity as the One-Eyed Owl, a ghoul, and as Sen Takatsuki, a bestselling horror novelist. She is capable of separating her two personalities with ease, but is committed to creating a society where ghouls are accepted.