Lilia Kudelfeyt, a central figure with piercing deep blue eyes and vibrant peach-colored hair, wears a crisp blue-and-white school uniform accented by a red tie, navy skirt, white socks, and polished black dress shoes. Born into a renowned family of magicians in Alto Goldfield’s hometown, she shares a lifelong bond with him, their shared upbringing and magical studies fueling her unspoken romantic longing. Her feelings remain tangled in jealousy, especially toward Vermeil, the demon Alto summoned, though she avoids confronting them openly.

Rational yet emotionally unpredictable, Lilia balances calm helpfulness with sudden hostility when angered, embarrassed, or pressed about her emotions. Stubborn and airheaded, she acts impulsively—brewing invisibility potions to infiltrate Alto’s room, for instance—while her tsundere nature flares in denials of affection, marked by blushing cheeks and sharp swings between bluntness and warmth.

A gifted summoner bound to Sylpheed, a high-level wind spirit, she excels in alchemy and tactical magic, crafting invisibility elixirs and deploying strategic spells in battle. Her rivalry with Vermeil culminates in a duel, which she loses, reluctantly agreeing to Alto’s insistence on friendship while still seeing the demon as a romantic threat.

Her growth unfolds through her uneasy alliance with Vermeil. Discovering the demon’s true identity as a devil, Lilia conceals the secret, prioritizing moral intent over species. This maturity reflects her empathy, acknowledging virtue and vice exist in all beings. Her loyalty to Alto endures despite his obliviousness to her feelings, and her vulnerability surfaces in moments like tearful gratitude when Vermeil rescues him from death.

Raised in a prestigious magical lineage and trained at Ortigia Academy of Magic, she channels her competitive drive into rigorous study. Though prone to mischief—sneaking into Alto’s dormitory, for example—her actions ultimately stem from a fierce desire to protect those she cherishes.