Eurynome serves as a high-ranking demon official in Pandemonium's Justice Department, distinguished by golden shoulder pads and a light violet dress that contrast sharply with standard demon uniforms. She maintains a composed, professional demeanor at work, recognized for cool efficiency in enforcing rules and peacekeeping. This disciplined exterior masks intense personal preoccupations.

Her defining fixation is an attraction to elementary school-aged boys, classifying her as a shotacon. She dedicates attention to observing youthful males from afar, particularly Dantalion—a library demon whose eternally boyish appearance belies his true age. Her persistent, one-sided interest drives her to watch his activities, including naps, from hiding spots and motivates frequent library visits.

Conversely, she displays pronounced aversion to adult males. To tolerate interactions, she activates "Wings of Imagination," mentally transforming grown men into idealized young boys within her perception. This distaste peaks with Astaroth, whom she deems insincere and promiscuous; her imagination recasts him as a fragile, needy child, heightening disdain for his actual persona.

Individuals outside her interests provoke visibly negative reactions, often manifesting as a grumpy or bitter expression. She openly declares herself a devoted connoisseur of boys without reservation.

Loose mythological inspirations include a Greek Titan goddess (Zeus's bride and mother of the Charites) and Oceanid nymphs linked to nature and seductive traits, contextualizing her passions within the series.