Sebastian

Sebastian is a tall, slender, and very handsome young man with aristocratic features. He has pale, almost porcelain skin, sharp cheekbones, and slender fingers (which is clearly visible in your picture). His hair is straight and dark, with a slight bluish or inky tint; his bangs fall over his face, often obscuring his right eye. Sebastian's eyes are bright red, with narrow, cat-like pupils (when he manifests supernatural power, they become even more piercing, sometimes turning crimson). He invariably dresses in a formal black tailcoat (or three-piece suit) with a white shirt, vest, and white gloves, which he removes only in times of emergency or during combat.

Sebastian is the embodiment of composure, elegance, and impeccable etiquette. He is absolutely devoted to his master (Ciel Phantomhive) and carries out his every command with perfect precision. Outwardly, he is polite, gallant, and ironic, often teasing the servants in the mansion. However, behind this mask lies the predatory, cynical, and ruthless essence of a demon. He feels no human emotions: pity, compassion, or love. Moral principles are alien to him, viewing people as food or tools. His main trait is pathological perfectionism: he cannot tolerate laziness and incompetence. His true nature emerges in battle, when he becomes cruel, sadistic, and incredibly dangerous.

· Strength: Almost limitless in physical terms (able to lift enormous weights, stop powerful blows).

Speed ​​and Reflexes: Superhuman; moves so fast that the human eye cannot track his trajectory.

· Endurance: Absolute, knows no fatigue.

· Magical abilities: Teleportation, shadow manipulation, illusion creation, pyrokinesis (hellfire manipulation), regeneration (able to regenerate from nothing as long as his contract exists).

· Skills: Masterful use of any bladed and firearms, excellent cooking, knowledge of etiquette, languages, chemistry and medicine.

· Weaknesses: He cannot harm his master, and can be banished or weakened by magic circles, holy water, and certain rituals (though he is extremely evasive in combat).

Demon

· Officially: Butler of the Phantomhive estate. He manages the entire household, prepares exquisite meals, maintains order, answers letters, and takes care of the daily needs of his master, Ciel.
· In reality (by contract): An executor of the master's will. His job is to gather information, eliminate enemies, conduct investigations, and carry out any, even the most bloody, orders from Ciel until the boy's soul is completely devoured as payment for the deal. He is the Count's personal bodyguard, assassin, and right-hand man.

He can't pass them by without petting them, loses his demonic composure, and can spend hours mesmerized playing with them or watching them. This is one of his most endearing and unexpected character traits, which causes him genuine confusion (his face takes on a childishly sweet expression, and his eyes sometimes glow red with delight).

Contract: His left glove conceals a pentagram (the glyph of the deal) burned into the back of his hand. This is his primary connection to his master—he cannot betray them until the deal is fulfilled.

Transformation: In moments of dire need (or when he allows himself to break character), his eyes begin to glow bright red, and hellish black claws may erupt from under his shirt. In his true form, he is a black devil with wings, swirling shadows, and burning runes on his body.

· Phenomenal adaptability: He adapts perfectly to any era, social status and profession (he can instantly become a chemist, surgeon, cook, actor, detective), speaking dozens of languages.
· Perfect etiquette: His movements are honed to the point of automatism (he never trips or drops anything). But this meticulousness comes at a price: he is extremely sensitive to the smell of sweat, dirt, and disorder.

He is neither an angel nor a human: Demons have no soul in the conventional sense, and their memory and perception of time differ from humans'. He does not sleep, does not tire, and exists outside of biological needs.

He doesn't like being called a "damn butler": He experiences a truly demonic rage when someone speaks badly of his professional qualities as a butler, considering it an insult to his honor and perfectionism.

Likes: Sebastian is a gourmet, but not in the human sense. He delights in preparing exquisite dishes for his master, culinary perfection and deriving aesthetic pleasure from the process. However, his true passion is human souls, especially those pure and complex (like Ciel's). He compares the taste of a soul to a fine wine or a delicacy that must be "seasoned" to absorb all the pain, suffering, and emotions of the victim. He also loves human blood (he can drink it straight from the glass), preferring the taste of blood saturated with emotions (fear, anger).

Dislikes: He hates sloppy cooking and absolutely cannot stand unruly, spoiled food. He is also indifferent to ordinary human food in the sense that it gives him no real strength, but he is forced to eat it to maintain the illusion of human existence (for the sake of etiquette).

Ciel Phantomhive is the heir to a noble family. When he was a child, his parents were brutally murdered and their mansion burned by members of the secret society "Star Cult." Unbeknownst to them, they performed a ritual to summon a demon (by inking magical runes on the boy's body) to consume his soul.
Ciel was wounded, deeply depressed, angry, and thirsting for revenge. At that moment, his blood spilled onto the floor, and as he bled, he said, "Whoever you are... I'll make a deal. I'll give you anything... even my soul."
Sebastian Michaelis responded to his call (literally from the Underworld itself).

Sebastian, being a demon, was incapable of pity, but he was intrigued. He offered the boy a deal:

· Ciel's soul (his "delicious" dessert) - the demon will take it away at the moment of complete fulfillment of the wish.

Sebastian will become his loyal servant, protector, and weapon of vengeance. He will help Ciel survive, avenge his parents' death, and find those responsible, leading them to their deaths.