Quinella is a major antagonist in Sword Art Online: Alicization. She is the pontifex of the Axiom Church and the most powerful ruler in Underworld, where she controls the world through authority, secrecy, and manipulation. Cold, brilliant, and highly ambitious, she seeks absolute knowledge and immortality. Quinella plays a central role in the series as the primary force opposing Kirito and the Integrity Knights, embodying the corruption and control hidden beneath Underworld’s system.