Grimoire, known as Grim, originated as a cunning and supremely proud demon ranked third among the Majin. His true form manifests as a towering black-furred bipedal goat with prominent horns, which can generate a second head to amplify spellcasting. For mundane interactions, he adopts a compact pink-furred pet form. When discretion permits, he assumes a humanoid guise resembling a dark-skinned teenage boy with white hair and unconcealable horns. Centuries before his current servitude, Grim plagued the Kingdom of Saloum until his imprisonment within a forbidden tome in the royal archives. Lloyd de Saloum, the seventh prince, eventually discovered and unsealed him. Grim attempted to dominate Lloyd but suffered overwhelming defeat, compelling him to acknowledge the prince’s unrivaled magical might. This loss forged a binding contract, reducing Grim to Lloyd’s familiar and transforming his pride into unwavering loyalty. As Lloyd’s bound follower, Grim provides pragmatic restraint during magical research or combat, frequently cautioning the prince about human frailty when recklessness—like intentionally lowering defenses—threatens Lloyd’s safety. His ancient knowledge and spells, including "Arctis Obscura" and "Great Spiral Black Flash Cannon," advance Lloyd’s studies, though their dynamic remains decisively weighted toward the prince. Their relationship evolves beyond servitude into a complex partnership. Grim’s initial awe of Lloyd’s power gradually incorporates reluctant guidance, such as repairing the forbidden library after their clash or mitigating consequences of Lloyd’s unpredictability. He strategically employs his forms: the imposing demon for power, the humanoid for semi-discreet presence, and the diminutive pink pet as camouflage during public excursions with Lloyd.