Mitera Dagonet

"I'll...blind you with my light, before I burn you with its radiance. Because you've lost the right to have my mercy!"

- Mitera in a rare moment of anger Mitera Dagonet (ミテラ ダゴネット, Mitera Dagonetto) is a Mage and retired Rune Knights Captain, with an almost legendary status in Seven, and its Magic Council's Branch, being most famous for her mastery over Light Magic, causing her to be known as the Paladin of Light (義侠の士の光, Gikyōnoshi no Hikari), later even getting the title of Deum Lucem (光神 (ディアム ルセム), Diamu Rusemu lit. Light God), being believed to be the strongest Light Magic user of her time.

Eventually retiring, she married Marx Dagonet, moving onto a secluded area in order to in peace away from the large crowds. However, Marx was possessed by Belial at his death bed, the demonic mask persuading Mitera to put him on her dying husband, fooling her to believe it would save his life. After possessing his body, Belial was ordered to remain with Mitera by Azazel, forcing to infect her with Black Blood, as a potential candidate for his Ultimate Demon, and live with her. As Marx's wife, she is also the mother of Archard Dagonet, having been born after an artificial impregnation performed by Azazel, utilizing the DNA of Marx, making it more akin to cloning.

At the moment, Mitera is considered to be Azazel's Number One Devil (ノンブル一悪魔, Nonburu Ichi Akuma), meaning she is his strongest and greatest candidate for his Ultimate Demon, due to surviving the side-effects of the Black Blood through sheer willpower, managing to endure its infection up to 100% without outside help, only a fake medicine given by Azazel.

Trivia

 * Mitera, or Mitéra, is Greek for "Mother", reflecting her being Amon's biological mother.