Professor Kokonoe Mercury (ココノエ=マーキュリー) is a leading member of Sector Seven, the daughter of two of the Six Heroes, Jubei and Nine the Phantom and niece of Celica A. Mercury. She is an accomplished scientist and helped organize the coup d'etat to put Homura Amanohokosaka on the throne of the Novus Orbis Librarium. Kokonoe is nearly always seen communicating with Iron Tager.