Lü is a supporting character from the anime, identified as a high-ranking demon belonging to the extremely rare Fenrir species. Having been rescued by the wizard Allen Crawford, Lü resides in his mansion as a loyal ally. As a Fenrir, Lü possesses traits and abilities associated with the mythical wolf, including enhanced physical prowess and formidable demonic power. Lü’s background involves being saved by Allen, which establishes a bond of gratitude and service. In the story, Lü acts as a reliable supporter, assisting Allen and the noblewoman Charlotte Evans when needed. Relationships are primarily centered on Allen as a rescuer and master, with interactions likely extending to other members of the household. Development over the course of the series is not extensively detailed in publicly available information, though Lü’s rescue implies past hardship and a role of steadfast cooperation. Notable abilities stem from the Fenrir bloodline, granting Lü both physical and magical capabilities befitting a high-ranking demon.