Name: Sebastian Michaelis (セバスチャン・ミカエリス, Sebasuchan Mikaerisu)
Sebastian's Faustian contract seal.
Sebastian takes on the appearance of a tall, handsome adult with black hair, red eyes, and pale skin. He typically dresses in a butler outfit, which consists of black trousers, a six-button double-breasted tailcoat, and a gray vest. He has the Phantomhive crest on his shirt cuffs and tie. He also sports a pocket watch and a chained silver lapel pin bearing the Phantomhive crest, as traditionally worn by the house's head butler.
His white gloves conceal the mark of his Faustian contract with Ciel Phantomhive on his left hand. He occasionally removes these, revealing black fingernails.
Sebastian's demonic form has never been fully shown. Details of this form include high-heeled stiletto boots, sharp claws, glowing fuchsia irises, slit pupils, and longer, sharper teeth, with dark wings.
Sebastian is a dedicated butler to Ciel Phantomhive; he upholds a strong sense of duty to his master and household. He follows and completes each order faithfully while always ensuring that the Phantomhive house runs smoothly. He does not sleep, for demons view it as a form of luxury, and thus frequently performs tasks for Ciel at night. The manner in which he responds to Ciel's demands is quite notable; he says, "Yes, my Lord."
Despite his appearance as a courteous and excellent servant, Sebastian is actually a heartless and sadistic demon. He expresses these traits in a very passive and sarcastic manner. He is ruthless when attacking others on Ciel's orders, such as when he kicks Grell Sutcliff's face because it is the thing he most cherishes. His diabolic nature is also shown through his dark humor and inability to see good in much of anyone. At times Sebastian can be indifferent, and he deliberately delays ensuring Ciel's well-being to tease him. Sebastian has also put Ciel's life in mild danger for his own amusement.He calls Ciel a "brat" who treats his workers rudely. However, despite all the troubles he goes through on a daily basis, he says that he does not dislike the butler lifestyle. He is also very polite.
Sebastian views money as "rubbish" or "materialistic," and is more than willing to give out generous amounts of pocket money given to him. He is fluent in French and Latin, enough to teach the latter. He is also knowledgeable and proficient in Deutsch (German) and East Franconian, a dialect in Southern Germany. Sebastian has a strong and mutual distaste for Grim Reapers. He greatly favors cats, and keeps at least thirteen hidden in his closet to prevent Ciel from finding out.
Sebastian often contemplates the behaviors and attitudes of human beings. He finds humans in general to be "difficult creatures," but he adds that their struggles and lofty goals make them interesting. He is also intrigued about how insatiable they are, as they are willing to "drag others down to get what they want, even in death."