Ciel Phantomhive, born December 14, 1875, is the younger identical twin of the Phantomhive earldom’s original heir. His early years were steeped in privilege and familial warmth, though chronic asthma and frail health restricted his physical pursuits. At ten, his world fractured when attackers destroyed Phantomhive Manor, slaughtering his parents, dog, and twin brother. Ciel and his brother were seized by a cult, branded with a "noble beast" sigil, and subjected to ritual abuse and sexual violence. During a sacrificial rite, Ciel invoked the demon Sebastian Michaelis, forging a Faustian pact to avenge his family. The contract branded his right eye with a pentagram, hidden beneath a black patch, and bound Sebastian to serve until vengeance was achieved. Assuming his deceased twin’s identity as Earl Phantomhive, Ciel became the Queen’s Watchdog, surveilling London’s criminal underworld. With Sebastian’s aid, he rebuilt the estate and founded the Funtom Corporation, a toy and confectionery empire fulfilling a childhood ambition. Behind his aristocratic poise lies unhealed trauma, marked by flashbacks, emotional detachment, and a ruthlessly pragmatic approach to justice, employing bribery, deception, and lethal force. Bound by loyalty and duty, Ciel is betrothed to his cousin Elizabeth Midford, shielding her fiercely despite their arranged engagement. His household—featuring the demon butler Sebastian and bumbling protectors like Mey-Rin and Finnian—balances domesticity with defense. Though often aloof, Ciel sporadically reveals concern, securing essentials for his staff or safeguarding Elizabeth. His relationship with Sebastian blends dependency and friction, as Ciel manipulates the demon toward his vengeful ends. Later revelations expose his twin’s survival, resurrected by the grim reaper Undertaker, culminating in accusations of identity theft and Ciel’s flight to clear his name. In spin-offs such as *The Forces of Grim*, Sebastian’s temporary demise severs their contract, leaving Ciel vulnerable and morphing him into a demon-human hybrid. This arc delves into his trauma and reliance on allies like grim reaper Mika Sato, who offers sanctuary. Ciel’s persona merges aristocratic icy resolve with youthful fragility. He savors sweets, horseback rides, and mystery novels but recoils from spicy foods and cats due to allergies. A strategic mind fuels his competitive edge in chess, while lingering traces of his past emerge in his affection for dogs, echoed by naming Sebastian after his childhood pet. Asthma and limited stamina contrast his tactical brilliance and firearm mastery, weapons ever-present for protection.