Eto has a sadistic personality, often expressing joy at the expense of others' suffering. She has no qualms about remorselessly slaughtering humans and ghouls alike, and shows happiness when inflicting pain on others. 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 but is committed to creating a society where ghouls are accepted.