The butler of the Phantomhive household and acts as Ciel's bodyguard, two jobs he is completely devoted to.
Sebastian Michaelis (セバスチャン・ミカエリス Sebasuchan Mikaerisu?) He is the butler of the Phantomhive household and acts as Ciel's bodyguard, two jobs he is completely devoted to. However, he is not overly concerned about Ciel's well-being as he insults and even harms Ciel to see his reaction. At one point, he releases venomous snakes even though he knows Ciel is in the area and could be bitten; he acknowledges this, saying "Any game becomes boring when it lacks thrills".
Sebastian often describes himself through the phrase "Because I am one hell of a butler" (わたしはあくまで執事ですから Watashi wa aku made shitsuji desu kara?). The phrase plays on the word "demon" (あくま akuma?) and the phrase "to the end" (あくまで aku made?). It can also translate to "I am a demon and a butler". He is highly skilled in any area and handles every task, no matter how impossible it is, as well as any problem that arises from the errors of the other staff with ease, stating it is only natural as the butler to the Phantomhive family. This is due to the fact he is a demon bound by a Faustian contract to abide by Ciel's will. A sign similar to the one marking Ciel's right eye can be found on Sebastian's left hand, which has been used on one occasion to twist the arm of a kidnapper without touching him. The name Sebastian is in fact a temporary name given to him by Ciel and was previously held by Ciel's dog. He bears a striking resemblance to Ciel's father. In the anime adaption, Sebastian can take the form of a crow or a cat. Sebastian's true demonic form has not been fully revealed. However, a depiction of sharper teeth, high-heeled boots, and elongated nails have been given. In the anime, his true form is also shown, but only briefly in glimpses at the finale, sporting high-heel boots and claw-like hands (the appearance of a goatee is given, but was subsequently discovered to be a animation error). In the manga adaptation, Sebastian appears to Ciel to form the contract in his true form, while in the anime version, he appears as a crow. He is voiced by Toshiyuki Morikawa on the first drama CD and Daisuke Ono in the anime adaption and on the second drama CD.[1][2][3] His name is similar to that of Father Sebastien Michaelis, who compiled a hierarchy of demons in Hell.
Sebastian is also shown to be very fond of cats as they are "cute and don't complain about useless things"