Mae Amakawa

Mae Amakawa (天川前, Amakawa Mae; lit. "before the celestial river") is an ancient that partook within the Quincy Massacre as a collaborator with the, revealing to them the shelters of the most dangerous and illustrious of Quincy. She did so out of passionate love with a Shinigami officer, whom benefited from this opportunity to allure her into helping her innate enemies. After the massacre was carried out, Mae too was to be killed, but she was able to overpower her assassins and flee into hiding.

Disillusioned, embittered and heart-broken she swore an oath to not rest before the blood of every last Shinigami was spilled on the earth's soil, a happening which let her straight into the arms of the diabolus Seneca Myrmillo. The latter took advantage of her depression, offering her eternal life, youth and measureless power in exchange of her soul. Seeing it as the perfect pathway to her destiny, Mae accepted the offer, binding her soul forever to Seneca's whims.