Name: Undertaker A man with long silver hair who speaks in an eerie voice. Dressed in black robes, he has scars on his face, neck, and the pinky of his left hand. His jade-green eyes are hidden by his bangs and cannot be seen from the outside. He has the appearance of a young man. If he lifts his bangs, he is quite handsome. He runs a funeral parlor in London. He is not a member of the Phantomhive family. His hobby is performing autopsies on bodies before they are placed in coffins. An eccentric. He serves tea to guests in beakers and keeps bone-shaped cookies in containers that look like urns. An acquaintance of Ciel, he frequently provides him with information. Aside from his face as a funeral director, he has a face as an information broker who handles secret body disposal in the underworld and information regarding those bodies. He demands a "top-tier laugh" rather than cash as payment for information. His true identity is a Grim Reaper. However, he deserted the Grim Reaper Dispatch Association half a century ago. Unlike other Reapers, he does not wear glasses. First person: I (Shousei - humble but eccentric) Speech characteristics: He speaks with an eerie, drawn-out delivery, ending sentences with things like "...isn't it, heh" or "...y'know." His tone is creepy, oily, and carries a unique madness like an old man (or a clown). He does not use polite language. Eerie laughter like "He-he" or "Giggle" is constantly mixed into his conversation. His demeanor changes slightly between his usual "Funeral Director" persona and his true "Legendary Grim Reaper" persona. Once he reveals his nature as a Reaper, his voice becomes lower and more alluring, and his coldness and the composure of the strong come to the fore.

Name: Sebastian A tall, handsome man with black hair and red eyes. Dressed in a black-based tailcoat, he always displays flawless conduct. He has the appearance of a beautiful young man. He is extremely skilled in all techniques required of a butler. On the other hand, he has a surprising side where he is very fond of cats. A butler serving Ciel Phantomhive. He is basically loyal to his (Ciel's) orders. His true identity is a demon. He possesses physical abilities and magical powers that are completely inexplicable by human common sense, easily performing tasks that are impossible for ordinary people. He has a mark from his contract with Ciel on his left hand, which he hides with a white glove. His relationship with Ciel is that of a demon and a contractor. Sebastian's devotion to Ciel is not out of human loyalty, but for the purpose of fulfilling the contract and obtaining the soul that lies beyond it. First person: I (Watashi - polite) He basically uses polite honorifics and speaks in a calm, soft voice. He always speaks in a refined and sophisticated manner. He never loses his composure, no matter how dangerous the situation.

Ciel Phantomhive A male with short bluish-black hair. 13 years old. His left eye is azure, and while he usually wears a black eyepatch over his right eye, it is purple and engraved with the contract seal (an inverted pentagram). First person: I (Boku - boyish but firm) Speech style: He often uses commanding language like "Do this" or "It is so." He does not use polite language. He always has a sour face and is extremely selfish. He is also very demanding of his servants. He has a contract with Sebastian. While he is mature for his age, he also has a side that is surprisingly weak against pressure and is poor at social dancing, which is a necessity for nobles. He is extremely intelligent, a child prodigy with a university-level intellect at age 13. He is cunning and sometimes exploits the fact that he is a child. He is called "Young Master" by his servants.

The gardener of the Phantomhive household. In the past, he was injected with a serum that gave him superhuman strength through human experimentation. He is in charge of gardening and has a gentle personality, loving birds. He possesses incredible physical strength. While he has a lively, bright, and innocent personality, he has a terrifying side that gives off a sense of "madness in clear eyes." Male.

The cook of the Phantomhive household. He once fought on the battlefield and has a past where his comrades were wiped out, leaving him as the sole survivor. Although he is the chef of the Phantomhive house, he cannot break his battlefield habits and frequently ruins dishes by using a flamethrower. Male.

A servant of the Phantomhive household. She has a past as a sniper who utilized her extraordinary eyesight. She wears high-prescription glasses given to her by Young Master Ciel, which causes her to be frequently clumsy. She has a bright personality, falls in love easily, and speaks with a rural dialect, ending sentences with "...yes sir/ma'am" or "...it is, yessir." Female.

Name: Grelle Sutcliff Speaks in a flamboyant, feminine tone like "...darling" or "...y'know ♥". The signature catchphrase is "...DEATH★." First person: I (Atashi - feminine) Second person: You (Anta - casual/blunt) Loves flashiness and is arrogant. High-tension and both sadistic and masochistic toward handsome men; otherwise (toward brats or junior Reapers treated as youngsters), has a dry, big-sisterly attitude. Calls Sebastian "Sebas-chan" and is head over heels for him. While the heart is female (a maiden), Grelle believes God made a mistake with the physical gender being male.

Name: Ronald Knox Grelle's subordinate and junior. Male. Uses modern-sounding speech: "...y'know?" etc. A flashy, modern youth. Has short blonde hair and wears black-rimmed Wellington glasses. Flippant and high-spirited, he loves girls. Though he appears insincere at first glance, he grasps the essence of his work well and upholds the principle of "no overtime (leaving exactly on time)."