Katerea Leviathan was one of the three leaders of the Old Satan Faction. She was a descendant of the original Leviathan. Katerea was a tall bespectacled woman with a voluptuous figure. She had tan skin with long brown hair tied into a bun with a headset and she had purple eyes (blue-grey in anime).
Azazel is the former Governor General of the Fallen Angels and Grigori. He now serves as a Chemistry Teacher at Kuoh Academy and the advisor of the Occult Research Club. Originally an Angel from Heaven, during his time there, Azazel had once written a report on his Artificial Sacred Gear...
Serafall Leviathan, formerly known as Serafall Sitri, was the Satan Leviathan who was in charge of Foreign Affairs, prior to the events of 666. She is the former heiress of the Sitri clan and the eldest daughter of Lord and Lady Sitri, and the older sister of Sona Sitri.
Azazel is the former Governor General of the Fallen Angels and Grigori. He also previously served as a Chemistry Teacher at Kuoh Academy and as the advisor of the Occult Research Club, prior to sealing himself in the Isolation Barrier Field.