Lily and her twin sister Lilia endured childhood abuse, leading them to flee home together. This shared trauma forged Lily's deep dependence on and protective bond with Lilia. Physically, Lily mirrors Lilia's facial features and hair color but possesses distinctive red eyes, contrasting with Lilia's blue. She typically wears her hair loose, unlike Lilia's ponytail. Their identical guild outfits differ only in the gem color on their neckwear, Lily's matching her red eyes.

Personality-wise, Lily exhibits kindness alongside significant insecurities, often perceiving herself as a burden to Lilia. She desires greater independence despite her clumsiness. While generally struggling to interact with men, she communicates comfortably with Rud, indicating trust. Her intelligence emerges during labyrinth expeditions, where she capably directs strategies, such as in the Keild Labyrinth raid.

Her skills include Dungeon Walk, enabling teleportation for up to six individuals within previously visited labyrinth floors, and Ice Magic. A defining ability is Fusion, allowing her and Lilia to merge into a single entity named Lilialy. Historically, Lilia controlled this merged form, but during the battle against Amon, Lily assumed control for the first time while Lilia was unconscious. As Lilialy, she retained Lily's primary appearance but exhibited heterochromia—one red eye and one blue eye. In that pivotal battle, Rud encouraged her to fight authentically, prompting her creation of the Multi-Element Blade technique. This skill channels four elemental attributes—Wind, Water, Earth, and Fire—simultaneously into her sword, unleashing a singular, devastating attack that defeated Amon.

Character development reveals Lily's progression from reliance on Lilia toward self-assurance. She actively seeks leadership responsibilities during raids to demonstrate capability, overcoming feelings of inferiority. Her initiative in commanding parties and devising combat strategies signifies growing confidence and tactical intellect.