Michael ranks among Heaven's four mightiest archangels and commands the Seven Heavenly Virtues, embodying the virtue of Faith. She assumed leadership of the virtues after Lucifer's banishment for rebellion. Her steadfast loyalty to God drove her to strike a deal with the demon lord Belial, promising Lucifer in exchange for tormented souls. Michael ultimately betrayed Belial to enforce divine will, permanently fracturing her former friendship with Lucifer into enmity.

To counter demonic influence on Earth, Michael spearheaded the virtues' search for a human Messiah. She imposed strict, militaristic training on the first candidate she found, preparing him to confront Lucifer directly. This included grueling physical drills for both the candidate and her fellow virtues. Despite her stern methods, Michael developed a fondness for the candidate after he consistently cooked her favorite egg-based dishes, particularly omelets.

Michael maintains a disciplined, authoritative, and often hot-blooded demeanor. She exhibits a paradoxical superiority complex towards allies, sometimes displaying rudeness without justification. Her commitment to faith is absolute, though she briefly faltered by contemplating humanity's destruction—an ironic lapse for the embodiment of Faith. Visually, she appears as a female angel of average height with long brown hair, red-orange eyes, and a slender, curvaceous figure. Her attire features a red military-style uniform with a commodore hat, black thigh-high leggings, and white combat boots. Her wings shift from pure white to bright red at the base.

Her departure from Earth involved directly addressing the audience, hinting at future visits while implying her candidate's memories would be erased. This act underscored her adherence to heavenly directives over potential personal connections.