Lily stands among Demon Queen Echidna's four generals as the Beast General, commanding the demon army's beastpeople. She appears as a young demi-beastperson with wolf-like ears, a tail, orange-brown hair, red eyes, a visible fang, and often goes barefoot. Her attire includes a skirt, midriff-baring top, bracelets, earrings, and a hair ornament. This appearance earns her the epithet "The Ruthless Fang."

She is a foundational pillar within the army's command structure, having played a pivotal role in supporting Echidna's recovery after their initial defeat by the hero Leo. Personality-wise, Lily exhibits childlike innocence, enthusiasm, and straightforwardness, alongside shortcomings in her duties; she approaches mission reports with the attitude of completing school assignments. She prioritizes communal well-being and enjoyment for those under her command, cementing her role as the emotional core of Echidna's forces.

A beastperson cultural tenet dictates that defeat by an opposite-sex opponent necessitates marriage. Consequently, she persistently pursues Leo as her destined partner despite his repeated rejections, fueling much of her interpersonal conflict. In combat, she possesses the ability to transform into Fenrir, a powerful wolf-god form used during high-stakes scenarios, such as overcoming supply mission challenges through brute force.

Her character development unfolds primarily through logistical responsibilities, notably during a critical supply mission to Largo Island. Initially treating the procurement task as a recreational outing, she jeopardizes deadlines. Under Leo's tutelage—though initially manipulative and dismissive of her intellect—she learns principles of task specialization and delegation. This culminates in her devising a sustainable system aligned with her subordinates' strengths, demonstrating adaptability and cognitive growth. Her narrative continues through later cooperative efforts during food crises and labyrinth expeditions.