Name: Sebastian Michaelis
Species: Demon (Crow/Raven)
Occupation: Ciel's Butler
Appearance: Sebastian takes on the appearance of a tall (6'1"), young adult male with at most times red eyes, at times they turn brighter or red-ish pink, and black hair; he was modeled by Ciel to resemble his deceased father. He is typically dressed in an outfit consisting of black trousers, tailcoat, vest, and a tie. He also sports a pocket watch with chain, and a chained silver lapel pin bearing the Phantomhive crest, traditionally worn by the house's head butler. White gloves conceal the mark of his Faustian contract with Ciel Phantomhive on his left hand. Occasionally, he removes his white gloves, revealing black fingernails. When acting as a tutor to his charge, he wears glasses and a scarf, and sweeps his hair back from his face. In the anime, when he becomes King Edward's and Richard's butler, his hair is much longer, and pulled back by a black ribbon. He also wears a slightly different outfit with a lacy ascot tie. He serves them only for a little while, never really being their butler. Sebastian's demonic form has never been shown fully. Details including high-heeled stiletto boots, a shower of black feathers, longer fingernails, glowing pink irises, slitted pupils, dark skin (like a raven) in the anime, and sharper, longer teeth. In the anime, he also has the ability to transform into a crow, although this has never been part of the manga.
Personality: Sebastian is a dutiful and dedicated butler to Ciel. He follows each order faithfully, while always ensuring that the Phantomhive house runs smoothly. As such, he is noticeably annoyed whenever they end up behind schedule. The way he responds to Ciel's demands is quite notable, as the servants are pleased when they can successfully imitate the way he says, "Yes, my lord," to Ciel.
At times, Sebastian can seem as if he doesn't actually care about Ciel's wellbeing, as he frequently teases him and has put his life in mild danger for his own amusement. Once, he responded to Ciel's kidnapping as "terrible," but only because the tea he prepared would go to waste. He also once called Ciel a "brat" who treats his workers rudely. However, Sebastian shows concern for Ciel even when his life is in no real danger, often giving him his coat when it's cold outside. He also shows concern for Ciel when he has an athsma attack and then once again when he has a panic attack. Soma once comments that he doesn't think Sebastian is very nice to Ciel, which Sebastian is surprised and worried to hear. He attempts to 'fawn over' Ciel by feeding him in bed, but Ciel immediately tells him to stop. Despite all the troubles he goes through on a daily basis, he has said that he doesn't think it's such a bad way of life. Despite his ability to appear like a perfectly normal human, especially one who is able to smile, be cheerful, and be understanding, Sebastian is, in actuality, quite heartless, sadistic, and malicious. This comes out when he attacks others on Ciel's orders, such as when he kicked Grell's face because it was the thing most important to him. It is also shown with his cruel sarcasm and his inability to see good in much of anyone. It is shown that Sebastian adores cats of all types, because they do not do or talk about useless things and "there is nothing cuter." He even forgives a tiger for biting him and promptly stops Beast from whipping it. He also compares the pads of a cat's soft paws to Ciel's sleeping face. Parallel to his love for cats, he despises dogs, because they make loud, barbaric noises. In the Phantomhive Manor Murder case flashback Sebastian was seen putting several kittens in his closest when he saw them in the rain. Sebastian never passes by a cat on the street without stopping to admire it, this made especially clear when he notices a mother cat nursing her kittens. Additionally, it is known that Sebastian does not sleep, except as a luxury, and frequently does tasks for Ciel at night. He also views money as "rubbish" and is more than willing to give out generous amounts of pocket money given to him
History: Little has been revealed about Sebastian's history, except that he first came to Ciel after Ciel was about to be sacrificed in a purist ritual. Ciel ordered him to slay his abductors. This marked the beginning of their contract. It is understood that this incident occurred two to three years before the events in the main storyline (first season.) When Sebastian was summoned in the manga, he appeared in his true demon form, while in the anime, he appeared as a crow accompanied by a rain of feathers. In the manga, it seems that Sebastian was summoned accidentally, but in the anime it is made apparent that Ciel knew about the existance of demons and how to summon them all too well. Also of note, he appears in front of Ciel's attackers in the manga, while in the anime, he appears in a limbo world. In both the anime and the manga, it is implied that Sebastian will take the role of Ciel's butler until Ciel has completed his personal mission of revenge -- that is the substance of their contract. Sebastian's job is to serve Ciel, doing everything from the mundane task of serving tea, to protecting Ciel from certain death, until Ciel's mission in life is complete. In return, Sebastian will receive Ciel's soul when said mission is completed. The demon was given the name "Sebastian" by Ciel for the duration of his duties as the Phantomhive butler. This name used to belong to a dog in the Phantomhive household. He was named after the dog because Ciel was angry that Sebastian looked vaugely like Ciel's father.
Sebastian stated that, in the past, he engaged in "messily sampling every dish available," and has since resorted to only consuming "high-quality" souls. As a result, he is, apparently, starving, but states that the dinner will be that much better the hungrier he is.
Additionally, it is known that Sebastian's real home is in an alternate world, but it is quite different from the human world. In particular, he has mentioned that the creatures kept as pets there are in no way comparable to cats (the example shown resembles the Alien creature designed by H.R. Giger.) It is also said that Sebastian has been alive for at least 100 years, possibly much longer; in episode 4 of Kuroshitsuji II, Sebastian briefly mentions that he met an ancient Egyptian mummy when it was alive - the Pharaoh/mummy, identified by Sebastian as Smenkhkare, reigned about 3000 years ago, towards the end of the 18th Dynasty (1336-1334BCE), hence this hints that Sebastian would have to be at least 3000 years old to have met the man. In the anime, he also claims to be responsible for the spread of the Black Death, which occurred about 500 years before the main storyline