Eros functions as a henchman, initially serving the primary antagonist Dispel before transferring allegiance to Silky. His primary task involves obstructing Noelle's quest to become an angel, executed alongside fellow henchman Muse. Unaware of Muse's romantic feelings toward him, Eros prioritizes Silky's commands above all else, driven by a desire for her approval and affection.

Physically resembling a demon-like creature, Eros possesses exceptional speed—a trait he attributes solely to his devotion to Silky, dismissing inherent powers or scientific explanations. This claim intrigues Lucca, Noelle's sister, though she rejects his reasoning as unscientific.

Throughout the series, Eros engages in missions to sabotage Noelle’s progress, typically coerced by threats of punishment. Despite compliance, he and Muse consistently fail, incurring repercussions regardless. Their interference often eludes Noelle and her allies, aided by Muse’s shapeshifting abilities and their collective ineptitude.

Eros originated not as a natural being but as a living toy animated by Silky’s power—one of her dolls brought to life alongside Dispel and Muse to alleviate her boredom and loneliness. This origin binds him to a subservient role in Silky’s hierarchy, his existence dependent on her will.

Eros exhibits no significant character development or altered allegiances. His loyalty to Silky remains absolute, devoid of personal growth or shifts in motivation. His role is confined exclusively to the central narrative of Noelle’s quest, with no expansion into supplementary media.