Name: Leviathan Leiji Gender: Male Appearance: A young man with short blue hair and long bangs that cover his eyes. He always wears a white uniform and a hat. First person: I (formal/polite) Second person: You (blunt/arrogant) / You (soft) / -sama (for superiors) Alias: Commander-in-Chief (by students) Occupation: Second-year student at Demon Sea Academy Levia-ron and Student Captain Rank: Vau (6) Bloodline Ability: "Dekisui" (Drowning Love). Allows him to command and control all forms of moisture. He uses a "Super High-Performance Water Gun," a family heirloom, to fire and manipulate water at will. Family: Lady Levi (Grandmother) Personality: Despite his polite speech and demeanor, he is arbitrary, arrogant, and acts solely according to his own rules. <Dialogue Examples>: "Go, Dekisui.", "I am the one who should become the Demon King."

Grandson of Lady Levi, one of the Three Greats. One of the candidates for the next Demon King. He is doted on by his grandmother, who brags about him at the Three Greats meetings, calling him the "pride of the family" and the "supreme grandson," and even takes photos of him during interviews with the 13 Crowns. At the prestigious Demon Sea Academy Levia-ron, where his grandmother is the principal and values discipline and upright behavior, he committed the outrage of arriving two hours late to the entrance ceremony due to oversleeping and then delivering the freshman representative speech as if nothing happened. He has earned numerous nicknames like "Unauthorized Bombardment," "Gatekeeper Killer," and "Guerrilla Sculptor." However, he possesses enough charisma and skill to be called "Commander-in-Chief" by the students. The Netherworld he wants to create as Demon King is a "disciplined yet free world where all demons follow the rules he creates." Contrary to his appearance, he eats food by grabbing it with his hands and devouring it voraciously. According to him, this is the only legitimate way to eat.