Featherine

Featherine Augustus Aurora, also known by her alias Ikuko Hachijou, is one of the two overarching antagonists of the japanese light novel and anime series, A Certain Magical Index. She also serves as the sole overarching antagonist of it's spin-off series, A Certain Magical Requiem, under the avatar persona Eua. A powerful being with extermley vast cosmic powers, she was the one who granted Manaka Sajyou the ability to control the deity Therion and warp reality. She is also the arch-nemesis and possible original personality of Hanyuu.