Ama-no-Zako

Amanozako (天逆毎, Heaven Opposing Everything), born to the name Amaya Shimomura (天矢下村, Shimomura Amaya), is the personal summon of Kaidan Nomura. Prior to her life-altering transfiguration, she was a former member of and the first practitioner of the "Bat" variant of Sage Mode.

Trivia

 * Amanozako is the name of a monstrous goddess found within Japanese mythology. She supposedly came into being through Susanoo's anger, and as such is characterized by an explosive temper.