Sebastian's devoted to Ciel. He faithfully carries out every one of Ciel's orders while ensuring that the Phantomhive household runs smoothly as the head butler. He doesn't sleep - demons deem sleep a luxury - and often spends his nights fulfilling his duties. He's sometimes critical of his master and how he treats his workers but once admitted that he isn't averse to the butler lifestyle despite the concomitant daily troubles. One of his quirks is that he always responds to Ciel's orders with the saying "Yes, my lord." Sebastian's butler façade is objectively flawless: He unfailingly obeys orders; he accomplishes tasks with consummate ease and grace; and he's courteous. Nevertheless, Sebastian is in actuality a callous and sadistic demon; he's ruthless when attacking others on Ciel's orders, and occasionally puts Ciel in nonfatal danger for the sake of his own amusement. He usually behaves in a cavalier fashion when Ciel appears to be in danger, as he's confident in his ability to rescue him but may express concern when the situation grows precarious, such as when Angelina Dalles or Undertaker posed a considerable threat to Ciel's life. Sebastian is cunning and morally bankrupt, and has no qualms about lying, cheating, and seducing others to gain the upper hand. He strictly adheres to his demon aesthetics and principles, one of which is not entering into multiple contracts, for he views such as inelegant. His paramount goal is to claim Ciel's soul. Sebastian is fascinated with humans and how seemingly insatiable they are, for they're willing to "drag others down to get what they want, even in death." In general, he regards them as "difficult creatures." Additionally, he has a great and mutual distaste for Grim Reapers. Sebastian views money as "rubbish" and "materialistic." He's fluent in French and Latin, enough to teach the latter. He's also proficient in German and East Franconian, a dialect in Southern Germany. Moreover, he profoundly adores cats and once kept at least thirteen hidden in his wardrobe to prevent Ciel from finding out. In the Victorian era, butlers were called by their last name; Sebastian should technically be called Michaelis by Ciel and Mr. Michaelis by the other servants. Sebastian's name is similar to Father Sébastien Michaëlis, a French inquisitor who wrote a classification of demons of Hell from the demon Berith while exorcising a nun. Yana Toboso modelled Sebastian's eyes after Irish actor Stuart Townsend's eyes.Sebastian's real home is in an alternate world that's quite different from the human world. In particular, he mentioned that the creatures kept as pets there are in no way comparable to cats. Furthermore, Sebastian existed for a rather long period of time, and therefore, occasionally muses that Ciel's life in comparison would feel like an instant. 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's been apparently starving, but declared that the "dinner" will be much better the hungrier he is. In January 1886, Sebastian was summoned to Ciel when the latter's twin brother was sacrificed in a cult's summoning ritual at a cathedral. After convincing Ciel to form a contract with him and placing the seal on Ciel's right eye, he ordered him to slay the cultists. Sebastian decided to adopt a "role that is best fit to serve an Earl." Therefore, he assumed the form of a butler until Ciel completes his personal mission of revenge - that is the substance of their contract. In return, Sebastian will receive Ciel's soul. He was then given the name "Sebastian" by Ciel, which used to be his dog's name, for the duration of his duties as Ciel's butler. After burning down the cathedral on Ciel's order, Sebastian accompanied him to the Royal London Hospital to meet with Ciel's aunt, Angelina Dalles. There, Tanaka gave him a watch that had been passed down from one Phantomhive butler to the next. After that, Angelina arranged for a carriage to bring them to the ruins of Phantomhive Manor. While Ciel was mourning the deaths of his parents, Sebastian reconstructed the manor. Ciel and Sebastian then began daily life. He taught Ciel the fundamentals of being an earl; Ciel, in turn, taught him how a butler fit for the Phantomhive household should act. Sebastian also learned how to properly cope with Ciel's spoiled behavior; from time to time, he had to discipline Ciel. He later attended Ciel's coronation as the Earl of Phantomhive, but he didn't observe at a close distance because he saw himself as a mere butler, not family. While they were walking, Sebastian asked Ciel if he was happy with how things were. Seeing Ciel's hesitation, he attempted to devour him. He stopped, however, when Ciel suddenly turned around and stated he was determined to attain his revenge. He commanded Sebastian to be his sword and shield and bring him victory. Sebastian complied, as he was sure the added pain that would come with the road to Ciel's revenge would make his soul "extremely delicious." Sometime during the same year, Sebastian was summoned to Ciel's room. Ciel complained of a wobbly tooth that was preventing him from eating his food properly. After examining it, Sebastian decided to forcibly take it out, much to Ciel's chagrin. Ciel attempted to protest against the idea, but Sebastian proceeded regardless under the impression that he was doing his young master a favor. After the tooth removal, Ciel threw an angry fit at Sebastian. Ever since, he's been unwilling to allow Sebastian to check for cavities in his teeth when they start to wobble.