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|Height||185 cm (6'1")|
|Occupation||Butler of the Phantomhive Household|
|Previous Occupation||Second-tier member of Noah's Ark Circus|
|Base of Operations||Phantomhive manor |
|Manga Debut||Volume 1, Chapter 1|
|Anime Debut||Episode 1|
|Japanese Voice||Daisuke Ono|
|English Voice||J. Michael Tatum|
Sebastian's real home is in an alternate world that is quite different from the human world. In particular, he mentioned that the creatures kept as pets there are in no way comparable to cats. Sebastian had briefly remarked that he met an ancient Egyptian mummy when it was alive, identified by Sebastian as Smenkhkare who reigned about three thousand years ago. He was a guest at the Schönbrunn Palace from time to time. He also claimed to be responsible for the spread of the Black Death that occurred five hundred years prior. In short, he mused that Ciel Phantomhive'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 is apparently starving, but he declared that the "dinner" will be that much better the hungrier he is.
Three years ago, he was summoned to Ciel Phantomhive when the latter was about to be sacrificed in an occult ritual. After forming the contract with Ciel and placing the seal on his eye, Ciel ordered him to slay his abductors. Sebastian was to adopt the role of Ciel's 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.
Once he was finished annihilating the cultists, they went 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 the 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 an being an earl, and Ciel instructed him on how to be a butler. He later attended Ciel's coronation as the Earl of Phantomhive, but did not 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 and, at Ciel's hesitation, attempted to devour him. He was stopped, however, when Ciel suddenly turned around and stated that he was determined to attain his revenge. He commanded Sebastian to be his sword and shield and to bring him victory. Sebastian complied, as he was sure that Ciel's soul would be extremely delicious.