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Sebastian Michaelis (セバスチャン・ミカエリスSebasuchan Mikaerisu?) is the butler of the Phantomhive household and acts as Ciel's bodyguard. Sebastian often describes himself through his catchphrase "I am simply one hell of a butler" (私はあくまで執事ですからWatashi wa akumade 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". In Funimation's English translation, this phrase becomes "I am a devilishly talented butler" or "I am one hell of a butler" which is, obviously, another play on his demonic origins.

He has been described by multiple women (Madame Red, city women, nun in anime) throughout the anime and manga series to be extremely attractive and seductive.

Being a butler is a job he is completely devoted to. He follows Ciel's orders faithfully, however, he does not seem to be overly concerned about Ciel's well-being most of the time, as he insults and irritates Ciel to see his reaction. However, occasionally he does appear to care about Ciel at times, such as in the Noah's Arc Circus arc where he was worried when Ciel had an asthma attack, and again later on when Ciel had a panic attack. He calls Ciel a "brat" who treats his workers rudely. Sebastian is also shown to be obsessed with cats, kittens, wild catlike beasts, and so on; in chapter 44 of the manga, he is shown to be hiding 15 cats in his room. In chapter 49, it is shown that he had found the cats outside in the rain when he was doing a task for Ciel, and he just couldn't leave them outside. He also appears to love a stray black cat with amber eyes, who occasionally appears near the Phantomhive household or inside the household's garden, waiting for him. Comically, the only times he does not follow Ciel's orders are when he sees a cat, too preoccupied with it to pay any attention to anything else. This occurred in the second season of the anime when he sees a mother cat with her kittens, and Ciel calls him a "cat obsessed moron." Also, he doesn't appear to hear anything that Ciel says when he is looking at a black cat in the alley they are hiding in right before Mary Jane Kelly is murdered. He has an extreme aversion to dogs, and it was much to his dismay when Pluto the hell hound came to stay at the manor.