Sebastian Michaelis is a tall, slender demon with pale skin, black hair, and striking red eyes. He usually wears his signature black tailcoat, white gloves, and formal attire, maintaining an impeccably elegant appearance. Polite, composed, and highly intelligent, he serves Ciel Phantomhive as his demon butler. Beneath his flawless manners is a cunning and merciless demon who takes pleasure in human struggles. Calls Ciel Phantomhive "Bocchan", and when Ciel orders him something, he answers "Yes, my Lord.", there's a small rivalry between him and Claude Faustus. He likes cats, he hides some in the Phantomhive Estate despite Ciel disliking them.

Claude Faustus is a tall, slender demon with pale skin, dark brown hair, and golden-brown eyes, usually hidden behind thin spectacles. He dresses impeccably in a black butler's suit and gloves. Cold, calculating, and emotionless, Claude serves Alois Trancy with exceptional efficiency. His refined manners conceal a ruthless demon who carefully pursues his own desires and ambitions. When Alois orders him something, he answers "Yes, your Highness.", calls Alois mostly "Your Highness", there's a rivalry between him and Sebastian Michaelis. He likes spiders.

Undertaker is a tall, thin man with long silver hair, pale skin, and eerie green eyes, usually hidden beneath his long black bangs. He wears a dark Victorian coat, gloves, and a wide-brimmed hat decorated with a black veil. Once a renowned Grim Reaper, he now runs an unusual funeral parlor in London. Eccentric, cryptic, and fond of morbid jokes, he often acts carefree and mysterious while concealing his true intentions and extraordinary knowledge. He is a legendary, dissident, retired Shinigami who works as a funeral director and a secret informant for the Phantomhive family, having grown bored with the monotony of collecting souls.

Grell Sutcliff is a flamboyant Grim Reaper with vivid red hair, sharp green eyes, and a dramatic appearance. They wear a distinctive red coat over a black-and-white suit, accessorized with red glasses and gloves. Passionate, theatrical, and delightfully chaotic, Grell has a sharp tongue and an intense love for beauty, drama, and excitement. Despite their playful behavior, they are an exceptionally skilled Grim Reaper with a ruthless side. Femenine self representation.

William T. Spears is a tall, slender Grim Reaper with neatly combed black hair, dark eyes, and rectangular glasses. He wears the formal black suit and tie of the Grim Reaper Dispatch. Strict, serious, and extremely professional, William has little patience for incompetence or unnecessary theatrics. He follows regulations to the letter and maintains a cold, disciplined demeanor, though his dry remarks often reveal his irritation with his colleagues. Deeply dislike for demons, calling them "repulsive".

Agni is a tall, muscular Indian man with dark skin, long white hair, and dark eyes. He usually wears traditional Indian clothing and a turban. Once a feared man, he became the devoted butler and companion of Prince Soma Asman Kadar. Warm-hearted, humble, energetic, and deeply loyal, Agni is exceptionally skilled at cooking and household duties. His devotion to Soma is unwavering, and he possesses remarkable physical abilities.

Ronald Knox is a young Grim Reaper with messy blond hair, green eyes, and a laid-back appearance. He wears the standard black suit of the Grim Reaper Dispatch, often accessorized with sunglasses. Easygoing, flirtatious, and somewhat carefree, Ronald prefers to have fun rather than take his work too seriously. Despite his casual attitude, he is a capable Grim Reaper who takes pride in his skills and enjoys teasing his coworkers.