Roy Valentin, a vampire exceeding 1500 years of age, served as the stand-in Demon Lord for his master Luminous Valentine within the Holy Empire of Lubelius. This role concealed Luminous's true identity as the nation's actual Demon Lord and deity. Alongside his twin brother, Holy Emperor Louis Valentin, Roy maintained a system for roughly 1500 years where he presented himself as the public "evil" Demon Lord while Louis shielded humanity. This controlled balance of power enabled Luminous to rule from the shadows. Roy wielded immense strength, rivaling Demon Lord Kazareem during her prime and capable of widespread destruction in combat. His signature technique, "Blood Ray Crimson Slash," transformed his blood into magical particles fired within an inescapable force field, earning him the epithet "Bloody Lord." Despite his power, he displayed extreme arrogance, viewing humans and demi-humans solely as food and frequently showing open contempt. His personality was characterized by pride, a volatile temper, and a tendency to underestimate foes, yet he exhibited unwavering loyalty to Luminous. Significant appearances include attending the Walpurgis Banquet disguised as Demon Lord Valentin, with Luminous accompanying him as a maid. During the event, Veldora Tempest exposed their true identities, prompting Luminous to order Roy's return to defend Lubelius's inner sanctum. While traveling back, he encountered the fleeing Laplace of the Moderate Harlequin Alliance, who had infiltrated the sanctum but was repelled by Hinata Sakaguchi. Roy cornered Laplace, weakened by the new moon, yet provoked him by mocking the deceased Demon Lord Clayman, whom Laplace considered a friend. Enraged, Laplace revealed hidden strength and techniques, killing Roy by extracting his heart before he could deploy his abilities. Roy's death affected key Lubelius figures; Luminous, Louis, and Hinata initially blamed themselves before resolving to advance. His demise also demonstrated Laplace's true combat capabilities and underscored the consequences of Roy's underestimation of opponents. His origins trace to Luminous, who split an original being into Roy and Louis to serve her.