TV-Series
Description
Ciel Phantomhive is the main protagonist of the Black Butler series. He holds the title of Earl and is the head of the noble Phantomhive family, a position he assumed as a child following the violent deaths of his parents, Vincent and Rachel Phantomhive. Beyond his aristocratic duties, Ciel is the business-savvy owner of the Funtom Company, a successful toy and confectionery manufacturing corporation. His most secretive and significant role, however, is serving as the Queen's Watchdog, a clandestine agent tasked with maintaining order in London's underworld and investigating cases that are beyond the reach of Scotland Yard.

Physically, Ciel is a young boy with an appearance that belies his heavy responsibilities. He has blue-gray or dark navy hair and sharp blue eyes. He typically dresses in elegant, often mature, Western aristocratic attire chosen for him by his butler, Sebastian Michaelis. The most distinctive feature of his appearance is the black eyepatch he always wears over his right eye. Concealed beneath it is a purple pentagram, the mark of a Faustian contract he has forged with his demon butler, a symbol that binds Sebastian to his will and marks Ciel’s soul as the demon's eventual prize. On his back, he bears a brand from the month he was held captive and tortured by a cult after his parents' murder. He also wears two rings: a deep blue family heirloom on his left thumb and a golden signet ring with the family crest on his right hand.

The driving force behind Ciel’s entire existence is revenge. His life was shattered on his tenth birthday when an unknown assailant set fire to the Phantomhive manor and murdered his parents. He and his twin brother (whose name was actually Ciel) were then captured and sold into slavery to a cult, where they were subjected to a month of horrific physical and psychological abuse. During a dark ritual where his brother was sacrificed, the surviving younger twin was presented with a choice. He rejected praying to a God who had failed him and instead summoned a demon. He forged a contract with it, offering his soul in exchange for the power to exact a complete and utter revenge on those who had destroyed his family and humiliated him. After this event, he assumed his deceased twin's name, identity as the Earl, and fiancée, becoming the Ciel Phantomhive known to the world.

In line with his traumatic past, Ciel's personality is marked by a profound and unnatural maturity, cold pragmatism, and a cynical view of the world. He is extremely strict, proud, and has little patience for failure or incompetence, often coming across as arrogant and demanding. He is a brilliant strategist and a calculating individual who views the people around him, including his demon butler, as chess pieces to be moved in his complex game of revenge and duty. Despite his cold exterior, he is not without a sense of honor and duty, showing loyalty to the Queen and moments of genuine, albeit often unspoken, concern for those he considers close, such as his fiancée, Elizabeth Midford. He also displays flashes of childishness, stubbornness, and a competitive streak that his butler often teases him about, particularly regarding his short stature.

Ciel’s key relationships are central to the narrative. His relationship with Sebastian Michaelis is the most complex; it is a transactional bond between a master and servant, a contractor and a demon, and a hunter and his prey. Ciel holds absolute authority over the demon through the contract, demanding flawless service, while Sebastian is merely waiting for the day he can consume the boy's soul. Nevertheless, a strange mutual dependence and understanding has developed between them. His relationship with his cheerful and devoted fiancée, Elizabeth Midford, reveals a softer side of him, as he feels a strong, protective responsibility towards her. His household staff, including the clumsy maid Mey-Rin and the elderly butler Tanaka, are loyal but largely incompetent, forcing him to rely almost entirely on Sebastian for any task of importance.

Throughout the story, Ciel develops by confronting the consequences of his revenge-driven path. He is forced to confront his own morality, making devastating choices that often blur the line between justice and villainy, which has earned him the epithet of the Evil Noble. His greatest development comes with the revelation of his true identity as the younger twin, a twist that re-contextualizes his every action and motivation. He is not the rightful heir but a boy living a lie, driven by a rage born from being violated, dehumanized, and losing his brother. This knowledge solidifies that his entire persona as the Earl is a performance for the sake of his revenge, making his fragile mental state and his fading memories of a happy childhood all the more tragic.

Despite being a genius businessman and a cunning strategist, Ciel has several notable weaknesses and limitations. He has little to no physical combat ability and relies entirely on Sebastian for protection. He suffers from asthma inherited from his mother and has severe allergies to cats. He also has a well-documented inability to dance, a fact Sebastian has mockingly described as a "destroying waltz". His true abilities lie in his intellect, his authority as the Queen's Watchdog, and the absolute command he holds over his demonic butler, who is the ultimate tool for achieving his goal.