Master Akasha

Age unknown (apparent age is 14), height: 151cm, measurements: B 78/W 56/H 79. Headmaster of the Royal Akasha Academy. Her specialized magic is Weapon Mastery. Her "Archive" and "Thema" are Pride (Superbia) and Judgment (Arbiter), respectively. She is one of the "Great Demon Lords." The magic book she possesses is "Ain Soph Aur."

Her real name is Asha. Despite her youthful appearance, she is in her late twenties, just shy of thirty. A genius mage who inherited the title of Master Akasha and the position of Great Demon Lord from her mother, Etheria, at a young age, she possesses numerous talents, including Yui's "Phantom Cross Evil Eye."

She was a close friend of Anastasia during her lifetime and was overjoyed when Anastasia qualified as a member of the Trinity Seven. Witnessing the moment when Ana disappeared due to Lilith being sent from another world, she vowed to find her, believing she must have reincarnated in the End Library as a Great Demon Lord, and later fulfilled that promise.

At Ana's earnest request upon their reunion, she secretly orchestrated the grand magic research battle at Biblia Academy. She personally defeated and captured Akio and Levi, and later fought Mira, who had infiltrated the End Library to rescue them, showing astonishment at Mira's unexpected talent. In the match, she demonstrated her power as a Great Demon Lord against the duo of Lilith and Mira, but when Arata was released, both Astral and Ana lost their power. She intervened with all her might to stop Ana, who was prepared to use the ultimate magic at the cost of complete annihilation, but was saved by Arata, who dispersed both their magics. Ultimately, she felt gratitude towards Arata, who saved Ana in exchange for the Demon King's Factor, and as a Great Demon Lord, she told him, "It would be fine if you perished there," but personally wished for his safe return as he resolved to head to the world of the Divine Comedy Gate.

In preparation for the Divine Comedy Gate arc, she provided the facilities of Akasha Academy and the secret treasure vault "Void Library," as well as herself and Ana as coaches, to retrain Arata, who had lost the Demon King's Factor. Later, when Arata's group headed to the Divine Comedy Gate, she was summoned by Lieselotte and the Twelve Demon Generals, Cagnazzo, to train Mira, who was unable to exert her power as desired in the internal world, subjecting her to harsh trials of dying and reviving repeatedly.

In the new chapter, she scouts Mira as a heavenly force to prepare for the battle against the "Goddess of Deep Darkness," who shows signs of revival. She informs Mira, who was still a hero candidate, that becoming a "true hero" would mean she would no longer be part of the Trinity Seven, giving her time to think before leaving. Later, when Mira visits the heavens as a candidate for arbiter, it is revealed that her biological mother, Etheria, had asked her to look after Mira.

She has mastered legendary-class magic that allows her to wield all kinds of weapons, armor, and combat tools without restriction, and she controls the "Eleven Divine Demon Swords of Tiamat," which house eleven powerful magics. She also used the mythical armament Gleipnir, stored in the End Library, to command the End Beast Garm. She can temporarily copy an opponent's magic book and return the exact same magic, possessing abilities befitting the name of a Great Demon Lord, wielding Demon King-class power despite not being a Demon King herself.