Sebastian Michaelis, a demon bound by a Faustian contract to Ciel Phantomhive, serves as the young noble’s impeccably precise butler. His polished appearance—black hair, reddish-brown eyes, and pale skin—contrasts with his demonic form: sharp claws, glowing fuchsia irises, slit pupils, shadowed wings, and clusters of eyes. Clad in a formal uniform bearing the Phantomhive crest, he embodies both elegance and menace. Summoned during a cult’s sacrificial ritual in 1886, he forged his contract with Ciel after the death of the boy’s twin brother, pledging unwavering loyalty and protection until Ciel exacts vengeance, at which point Sebastian will devour his soul. Post-ritual, he orchestrated the Phantomhive manor’s reconstruction and trained eccentric servants—explosives-prone Baldroy, sharpshooter Mey-Rin, and superhumanly strong Finnian—to channel their chaos into domestic efficiency. A blend of cold professionalism and sly sadism, Sebastian executes duties flawlessly yet subtly engineers perilous scenarios for Ciel’s amusement, stopping short of mortal danger. He intervenes earnestly in genuine crises, confronting foes like the enigmatic Undertaker or vampiric Angelina Dalles. Governed by a personal code of aesthetics, he spurns multiple contracts and savors refined souls, abandoning his past habit of casual soul-tasting. Multilingual in French, Latin, and German, he wields charm as deftly as manipulation. His affinity for cats surfaces in covertly hoarding thirteen in his wardrobe and comparing humans to fickle felines. Though typically dismissive of human fragility, he harbors rare admiration for individuals like Agni, a butler whose skill earned his respect. Beyond managing Ciel’s Funtom Company and probing the Phantomhive family massacre, Sebastian navigates supernatural threats, clashing with detested Grim Reapers and exploiting mortal weaknesses for tactical advantage. Whispers of his past, like a disruptive 1866 incident at Schönbrunn Palace, hint at centuries of existence. He regards human lives as ephemeral yet endlessly intriguing, pondering their paradoxical blend of avarice and tenacity with detached curiosity.