"Ciel Phantomhive" ("シエル・ファントムハイヴ", "Shieru Fantomuhaivu") is the true head of the Phantomhive house. He is also the identical twin brother of Ciel Phantomhive and Elizabeth Midford's original fiancé.
"Ciel" looks identical to his brother and they have been stated to be mirror twins, but unlike Ciel, he does not bear a Faustian contract mark on his right eye. Another noticeable difference is that while Ciel's bangs curl to the right, "Ciel's" bangs curl to the left.
He is an individual who exudes confidence and remains unruffled, even when accused of being an impostor.
"Ciel" has a notably more confident aura than his brother; he is usually seen smiling widely, laughing and playing with Elizabeth. He also did not suffer from debilitating asthma as his twin does.
Despite their differences in personality, "Ciel" was very close to his twin brother Ciel and often stayed inside with him to keep him company as Ciel has asthma and thus could not play outside. Furthermore, "Ciel" would warm milk for his brother in the middle of the night and sneak cough drops for him.
"Ciel" was content to eventually succeed this father as the Earl of Phantomhive until Vincent took his sons to the nearby town for a lesson, and Ciel entrusted his brother that he would like to open a toy shop in London in the future. Not wanting to part with Ciel, "Ciel" told his parents that he did not want to become Earl anymore and run a toy store with his brother instead. After a conversation with Rachel and Vincent, "Ciel" reluctantly accepted that he did not have any other choice but to become the Earl of Phantomhive.
The years passed, and on December 14, 1885, "Ciel"'s tenth birthday, he was woken up by his twin brother. Ciel opened their advent calendar, retrieved two rabbit fèves, and gave one to "Ciel." They wished each other a happy birthday before getting dressed and going downstairs to marvel at the decorated dining room and the presents under the tree.
The twins were then congratulated by their parents and given the day off from their studies. Happily, "Ciel" and Ciel walked around the manor until arriving at the kitchen. However, they were quickly sent out by Tanaka and the cooks as they were not allowed to see their birthday cake until the party started. Tanaka told the twins that he would come to their room at six o'clock to get them ready for the party.
The twins went to spent the time waiting with playing games in their room, and eventually fell asleep. When they woke up, it was already six o'clock, however, Tanaka had not arrived. They waited for him, but when he still had not come 45 minutes later, "Ciel" and Ciel became anxious. Then, "Ciel" decided to go and look what was wrong. Ciel wanted to accompany him, but "Ciel" told him to stay in their room and left.
"Ciel" wandered around Phantomhive Manor, eventually discovered the corpses of Vincent and Rachel, and took the blue Phantomhive ring from his father's finger. At some point during the attack on the manor, something terrible happened to "Ciel". He was later kidnapped by human traffickers and tagged just like his twin brother.
After being put into the same cage, "Ciel" said that he was "pathetic" and "a failure of an older brother" for not having been strong enough, for not having been powerful enough. He began to cry and to apologize repeatedly, and the twins embraced each other and cried together.
At night, "Ciel" woke up and raised Ciel out of his sleep. Then, he showed his brother the blue Phantomhive ring and told him that it would help them return to the manor before swallowing the ring to make sure that it would not be taken away from them.
The next day, the twins were brought by a man and taken to his mansion. There they were washed, dressed, and given food. While Ciel believed that they were saved by a "nice man," "Ciel" remained suspicious.
Later on that day, the twins were dressed for a "party." The man took them to a cathedral where many people wearing masks in the shape of moths had gathered. Ciel asked the man, who brought them there, where they were, but he only replied that they did not have to be afraid before announcing to the crowd that the twins would be their next sacrificial lambs and that they had to defile their pure and innocent souls in order to "prepare" them for the ritual. "Ciel" and Ciel were then violated by the cultists.
Blue Cult Arc
Later, Ciel Phantomhive and Sebastian Michaelis also enter the manor. "Ciel" hears them and descends the stairs, to their collective shock. He scolds a dismayed Ciel for getting drenched and assures him that he will never leave his side again and that he has come home. When Finnian states that it is impossible for there to be two Ciels, "Ciel" asserts that he is real. Finnian adds that he knew something was wrong when "Ciel" came home and calls him an impostor. Amused, "Ciel" declares that the true head of the Phantomhive house, Ciel Phantomhive, is actually him.
"Ciel" muses that this is the first time he has actually met Sebastian. He promptly asks him how dare he "do that" to him on "that day". Sebastian affirms "Ciel's" statement that he is "Earl Ciel Phantomhive", to the servants' disbelief. At that moment, Tanaka arrives at the staircase and addresses "Ciel", stating that he was not in his room when he brought his tea. He reveals that he knew all along that there were two Ciels; twins in fact, to the bewildered servants.
An amused "Ciel" chides Ciel for confusing the servants by impersonating him. He adds that Tanaka told him that he used losing everything in the fire as an opportunity to hide the fact that he was a twin and calls Ciel a naughty boy for doing so. Ciel is hesitant when "Ciel," asks him why he made such an outrageous lie and states that he will not be angry with him. Ciel, then, mutters that he is "the spare" to "Ciel Phantomhive", heir to the Earl of Phantomhive.
- (To his father, Vincent Phantomhive, as a child): "I don't need fake brothers."
- (Ciel Phantomhive about "Ciel Phantomhive"): "You were strong and kind, but you hated to be alone."
- "Ciel"'s name means "sky" in French, Italian, and Norman and also "heaven" in French, Italian, and Old French.
Out of Universe
- "Ciel"'s birthday (December 14) is also the date of Prince Albert's death. Coincidentally, in the second season of the anime, the "deathday" of "Ciel"'s twin brother (August 26) is Albert's birthday.