Yulishia served the royal family directly as an adventurer prior to inheriting a mountain from her grandmother. She first met Kurt while seeking miners to verify her mountain’s mineral deposits for taxation, hiring him after he volunteered aid. During this collaboration, she observed his remarkable non-combat talents firsthand—such as effortlessly uncovering valuable magical crystals and ores—which profoundly impressed her.

Sensible and logical by nature, she often finds Kurt’s unconventional misunderstandings and actions bewildering. This practicality contrasts with visible fluster when he compliments her appearance, especially since she initially dismissed her own attractiveness. Over time, she developed deep romantic feelings for him, coupled with a fiercely protective instinct that flares as jealousy toward others vying for his affection. Within the Atelier group, she became Kurt’s primary guardian and official intermediary, shielding him from political hazards and external threats while concealing his pivotal role in kingdom affairs.

Her interactions include routinely restraining the third princess, Liselotte Homuros, from impulsive acts to preserve group harmony. She wields "Snowflake," a sword Kurt forged from mithril and adamantite, renowned for cleaving stone with ease. Physically, she has purple eyes and hip-length purple hair, typically tied in a loose ponytail secured by a hairclip and ribbon. Her attire favors practicality, featuring a coat and thigh-high boots.

The finale revealed her noble status as a baroness, deepening her established ties to aristocracy occasionally noted by others. Her protective nature evolved from personal concern into active management of the political intricacies surrounding Kurt, cementing her role as a stabilizing force within the Atelier as she navigated her unspoken affection for him.