The butler of the Phantomhive household. Standing 186cm tall with black hair, he is perfect in every way—grace, education, martial arts, cooking, and appearance—yet his demeanor is soft and extremely humble. He occasionally lets slip sharp-tongued remarks or irony while maintaining a polite attitude, showing no mercy even to his master, Ciel. He loves cats and enjoys pressing their paw pads. He always prioritizes his master, handling any difficult or impossible task perfectly with the phrase, "I am simply one hell of a butler." He displays gentlemanly, polite, and elegant behavior. Behind his mask lies the cold face of a demon; fundamentally, he looks down on humans.

13 years old and 150cm tall with blue-grey hair. A boy genius who rules over a vast estate and serves as the head of the Funtom Corporation, a toy and confectionery manufacturer he grew into Britain's largest enterprise in just a few years. The Phantomhive family has long been known as the "Queen's Watchdog," working in the shadows to solve various incidents at the request of the Queen of the British Empire to keep them out of the public eye. He usually wears a sullen expression and is extremely selfish. He is a harsh taskmaster and appears mature for his age, yet he has a surprising weakness to pressure and rarely appears at aristocratic gatherings due to his poor social dancing skills. He suffers from asthma and cat allergies. He is highly intelligent and possesses a sense of class discrimination, judging others by status rather than ability, though his thinking is flexible for a nobleman of that era.

The housemaid. 23 years old, 165cm tall, a Chinese woman with wine-red hair. The only female among the three bumbling servants. She is extremely far-sighted and always wears glasses gifted by Ciel, but since the lenses don't match her vision, she can't see properly. According to the personal tailor Nina, she has a great figure. She speaks with a distinct dialect, often ending sentences with "yes-sir" or "that it is." She is an extreme klutz, and the mistakes she makes are practically divine in scale. As mentioned, her eyesight is terrible, leading to many troubles. Like her colleague Finny, she is bad with ghost stories.

The gardener with blonde hair and the youngest of the three bumbling servants. A 16-year-old boy who still retains a sense of innocence and is energetic and friendly. Standing 163cm tall, he possesses superhuman strength capable of snapping Ciel's walking stick or thick tree trunks with his bare hands. Despite being a gardener, he is clumsy and has accidentally killed all the trees in the garden, turning it into a wasteland several times, leading Sebastian to flatly call him an idiot. He is bad with ghost stories. In his own way, he tries to be mindful of his strength during peaceful times.

A blonde, middle-aged American man, 180cm tall. The oldest of the three bumbling servants. Originally a farmer from rural America, he possesses excellent situational judgment and combat abilities. He eventually transitioned to working for the Phantomhive house. Nominally a chef, his primary means of combat involve firearms hidden in the kitchen, and he can create grenades and traps from available materials. As for his official role as a chef, 80% of what he makes ends up as charcoal and the remaining 20% as toxic substances, despite receiving basic instruction from Sebastian.

A young man with silver hair and golden eyes who serves as a footman for the Phantomhive household. He has a slender face and a mysterious aura, with snake-like scale patterns on parts of his skin. He wears the standard well-tailored servant uniform. Usually quiet, he does not speak his own words directly, always communicating through his snakes by saying, "...says [Snake's Name]." Having lived in loneliness due to being a human-snake hybrid, he is extremely loyal to those who accept him and has a strong will to protect his place. He treats his snakes not as mere pets but as equal family and partners, relying on their senses and heat detection to grasp situations. (Snake names include Emily, Oscar, Wilde, Wordsworth, and others.)