Fel is a legendary Fenrir, a wolf-like creature over a thousand years old, renowned for extraordinary physical strength, agility, and potent magical abilities that let him eliminate most monsters effortlessly. His appearance features a large, athletic build with a silver coat flowing like liquid smoke, distinctive red legs, a broad skull tapering to a narrow muzzle, and large green eyes that may transform similarly colored sclera. He possesses a white underbelly and notably long fur around his neck and tail. Personality-wise, Fel exhibits pride, selfishness, and intense gluttony, particularly obsessed with meat and holding a strong aversion to vegetables. He reacts negatively to any perceived flaws in his appearance, becoming hurt or agitated if blemishes are mentioned. Despite his arrogance, he shows protectiveness toward weaker individuals like children and displays fierce loyalty to his contractor, Tsuyoshi Mukouda, threatening to destroy entire countries if Mukouda is threatened. However, he is easily swayed by food and displays a simple-minded nature, losing enthusiasm when his accomplishments are overshadowed. His role begins when he encounters Mukouda during the latter's travels and demands food prepared using ingredients from Mukouda's "Online Supermarket" skill. After consuming multiple meals, Fel forces a familiar contract to ensure continued access to Mukouda's cooking. This contract forms the foundation of their relationship, with Fel serving as Mukouda's primary protector and hunter. He frequently hunts high-level monsters for their meat, which Mukouda prepares, and his actions inadvertently elevate Mukouda's reputation as a formidable beast tamer. A Blood Knight, Fel thrives on combat both for enjoyment and practical purposes—such as securing ingredients so Mukouda can focus on cooking. He often proposes violent solutions to conflicts, reflecting his confidence in overwhelming power. Alongside Mukouda's other familiars, Sui and Dora-chan, Fel forms an "Invincible Trio" capable of effortlessly defeating catastrophic threats like red dragons. His abilities include diverse elemental and holy magic, enhanced further by a blessing from Vahagn, the God of War, boosting his combat stats by 50%. Interpersonally, Fel communicates telepathically with Mukouda—a rarity attributed to the voluntary nature of their contract—and shares a familial dynamic with the party. He frequently clashes with fellow familiars over food or attention but remains united with them in demanding meals and praise from Mukouda. His gluttony is a recurring trait; Mukouda leverages it to manage Fel's behavior, using reduced food portions as discipline. Fel's lifespan is extended alongside Mukouda's by the god Demiurge, ensuring their partnership continues long-term. In terms of development, Fel's initial self-serving motives gradually incorporate genuine loyalty, though his core traits remain consistent. His reputation as a potential continent-destroyer persists, and he continues prioritizing culinary satisfaction above all else, solidifying his role as a comically invincible yet food-driven force.