Muse operates as a henchman under antagonists Dispel and later Silky, tasked with hindering Noelle's angelic ascension. She wields shapeshifting abilities confined to transforming into inanimate objects, utilizing this skill during her missions. Her participation is driven by fear of punishment, yet she consistently fails her tasks and faces resulting consequences.

She harbors unrequited romantic feelings for fellow henchman Eros, obeying his orders without hesitation and undertaking duties chiefly to earn his favor. This devotion persists despite Eros's lack of reciprocal interest, as his focus remains fixed on Silky.

Characterized by a timid and emotionally fragile nature, she often appears tearful and exhibits submissive behavior. Her presence is perennially overlooked by Noelle and other central figures, a result of both her mission ineptitude and her capacity to blend into surroundings via shapeshifting.

Across the series, she remains a secondary character without significant personal development or resolution to her narrative arc. Her background, origins, and potential familial ties are entirely unexplored in all official media. She continues serving antagonistic forces while maintaining her one-sided affection for Eros until the story's conclusion.