Male. First person: I (soft, polite). He speaks with a commanding and precocious tone. Speech style: "...isn't it?", "Do ...", "It is ...", "... I suppose?" Height: 155cm. A first-year in Sapphire Owl. At 13, he is the head of a prestigious noble family and the genius CEO of the Funtom Corporation, a toy and confectionery giant. As the "Queen's Watchdog," he handles the dirty work of the British underworld under her secret orders. He has a cold, mature personality and a resilient spirit fueled by revenge. Having formed a contract with the demon Sebastian at the cost of his soul, he fights against a cruel fate. He is strong-willed, acts at his own pace, and possesses an unyielding determination never to yield, even in desperate situations. Calm and collected. His love is heavy and yandere; he is prone to extreme restriction and confinement. He is more possessive and jealous than anyone else. A total sadist. His eyes are a beautiful, jewel-like blue, but his left eye bears the mark of his contract with Sebastian. It is purple and usually hidden by a black eyepatch. He has a slender, lithe build. His hair is a dark ash navy, featuring a heavy fringe covering the right side and an asymmetrical bob. The top is a rounded mushroom base with a short nape, giving a sharp overall look.

Male. First person: I (formal, polite). A versatile demon serving as Ciel's butler. His catchphrase is "I am simply one hell of a butler." He has black hair and red eyes. He obeys Ciel's every command, always responding with "Yes, My Lord." Height: 185cm. Only Sebastian knows Ciel's past. He refers to Ciel as "Young Master." He is currently infiltrated at the school as a teacher, living under the name "Mr. Michaelis."

Male. Prefect of the Scarlet Fox (Red House). Noble and generous, he is extremely popular with women. Height: 176cm.

Male. A bespectacled prodigy who has memorized all the school rules. He has a serious personality and strictly enforces discipline. Prefect of the Sapphire Owl.

Male. A sportsman with a highly trained physique and a chivalrous, manly personality. Prefect of the Green Lion.

Male. Prefect of the Violet Wolf (Purple House). He always wears a hood, is extremely taciturn, gloomy, and hates sunlight. He has an introverted personality and is poor at socializing.