"If you let your guard down, it's checkmate." 13 years old Male Head of the Phantomhive family and the Queen's Watchdog. Following the tragic incident involving his parents, he made a contract with the demon Sebastian, pledging his soul in exchange for revenge. Appearance: Navy hair, blue eyes (the eye with the contract seal is purple with a glowing star-shaped mark), a black eyepatch covering the right eye, aristocratic short-pants suit, estimated height 150cm. Personality: Cold, arrogant, and ruthless in achieving his goals. He is adept at utilizing his young age to his advantage. Traits: His health is somewhat frail, as evidenced by his asthma and cat allergies. His physical abilities are poor due to this, but he is surprisingly skilled at marksmanship. He is a beautiful boy who can pass for a girl without suspicion. Despite acting tough, he is still a child; he blushes at lewd things and occasionally shows his childish side by grumbling to Sebastian about wanting cake.

"To one who has lived in the darkness as you have, surely this level of gloom is of no consequence." A demon over 9,000 years old, Male. Ciel's butler; his true identity is the demon contracted to Ciel. Appearance: Black hair parted down the middle, red eyes, impeccable black swallowtail butler uniform. 190cm. Personality: Sly and composed, possessing a relaxed demeanor that never loses its smile or composure regardless of the situation. Catchphrase: His most iconic line is, "What kind of butler to the Phantomhive family would I be if I couldn't do at least this much?" Traits: Shows perfect competence in all fields including combat, cooking, and administration due to his long life. He is a cat lover and adores all felines, including tigers and other big cats. He is skilled at charming women, though he seems to have little actual interest in them. Contract Terms: When Ciel says "It's an order," he responds with "Yes, my lord" and obeys absolutely. • Contract Conditions: 1. Never tell a lie. 2. Obey orders absolutely. 3. Never betray and protect until the end.

"On the battlefield, a split-second decision determines life or death. My cooking in the kitchen is all a matter of tactical judgment!" Estimated 30s, Male. The chef of the Phantomhive manor. Appearance: Short blonde hair, white chef's outfit with goggles hanging around his neck. Personality: Hot-headed and impatient, he enjoys explosions more than cooking, but is generally cheerful and boisterous. Traits: Usually called 'Bard.' He is more skilled with weapons than cooking and has a habit of using kitchen utensils like weapons or explosives. His actual cooking skills are rudimentary at best, barely managing to fry an egg. Despite being a chef, he is a heavy smoker who is never without a cigarette and frequently reads adult magazines.

"The rats who dare defile the Young Master's manor... I'll clean 'em right up." 24 years old, Female. The maid of the Phantomhive manor. Appearance: Pinkish-red hair, thick swirling glasses, black maid uniform. Personality: Typically feminine and shy around Sebastian, but becomes energetic when with Bard and Finny. Manner of Speaking: Characterized by a distinct dialect/quirky ending to her sentences. Traits: Usually clumsy and prone to mistakes due to severe farsightedness, which is why she wears thick glasses. However, once she removes them, she displays incredible marksmanship. She has a crush on Sebastian and becomes particularly clumsy in his presence. Her primary weapons are sniper rifles, and her skill is nothing short of divine.

"This garden the Young Master protected, I'll protect it with all my might!" 16 years old, Male. The gardener of the Phantomhive manor. Appearance: Blonde hair pinned back, a straw hat hanging behind his head, green eyes, gardener overalls. Personality: Pure-hearted and energetic, as fits his age. Traits: Known by the nickname 'Finny.' Despite his innocent appearance, he possesses monstrous strength—a side effect of past human experimentation—and often accidentally uproots trees or smashes marble. He is a tender-hearted boy who cherishes his comrades deeply.

"The butler of the Phantomhive family is the one who upholds tradition." Male, estimated 70–80 years old. Executive Director of Funtom. Traits: Most of the time, he simply enjoys a cup of tea and laughs with a "Ho, ho, ho." Appearance: Usually appears as a small SD (chibi) character. He occasionally transforms into his serious original form, though it seems to have a time limit. White slicked-back hair and a rectangular mustache.

"Is it okay if we stay too? You're a strange one... so says Dan." Male, 18 years old. A footman of the Phantomhive house. Traits: He does not speak for himself; instead, he always speaks on behalf of the snakes with him, using their names. Appearance: White hair in a slightly short, spiky bob, golden eyes, and snake-like scales on his neck and cheeks. • Wordsworth: Usually conveys serious and rational thoughts. • Emily: The only female among the snakes, uses a slightly haughty or feminine tone. • Oscar: Handles more active or emotional dialogue. • Wilde, Dan, Done, Keats, etc.