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Sebastian Michaelis is a demon bound by a Faustian contract to Ciel Phantomhive, young head of the Phantomhive household. This pact demands absolute loyalty in aiding Ciel's quest for vengeance against his family's murderers, with Sebastian's ultimate reward being the consumption of Ciel's soul upon completion. He embodies the perfect butler, executing all household duties and crises with superhuman efficiency, frequently declaring himself "simply one hell of a butler." His capabilities encompass exceptional combat skills, swift problem-solving, and mastery of domestic tasks, though he occasionally places Ciel in peril for amusement while preventing fatal harm.

His demonic nature renders him ruthless, sadistic, and manipulative toward threats, yet he exhibits a fascination with human behavior, particularly greed. He maintains a polite, graceful exterior but displays a distinct fondness for cats, which can momentarily distract him. His origins remain undisclosed, reflecting millennia of existence.

In *Book of the Atlantic*, Sebastian accompanies Ciel aboard the luxury liner *Campania* to investigate the Aurora Society's necromantic experiments. During the voyage, he battles reanimated corpses and Grim Reapers, including Grell Sutcliff and Ronald Knox. A pivotal moment occurs when Undertaker, revealed as a former Grim Reaper, wounds Sebastian with a death scythe. This injury exposes Sebastian's cinematic records, triggering flashbacks of his early ineptitude as a butler—such as failing to prepare proper tea—and Ciel's initial lack of education for his role as Earl. These memories depict their mutual training and evolution into their current master-servant dynamic.

Despite his injury, Sebastian protects Ciel during the ship's sinking, battling hordes of reanimated corpses alone on a lifeboat to shield other survivors. By dawn, weakened but victorious, he eliminates all threats. Ciel, showing uncharacteristic concern, orders him to rest, signaling evolution in their relationship beyond mere contractuality. Sebastian's actions reinforce his unwavering commitment to the contract.

His backstory includes summoning during a ritual sacrificing Ciel's twin brother. He eradicated the cult members present and formally contracted with Ciel, thereafter dedicating himself as butler. His left hand bears the contract mark, enabling him to locate Ciel when exposed. He trains and manages the Phantomhive household staff—Baldroy, Finnian, Mey-Rin, and Snake—while openly critiquing their incompetence. His true motive remains claiming Ciel's soul, yet his interactions occasionally suggest complex, near-human attachments to his role and master.