MK v2 14
Kanji 悪魔
Romaji Akuma
Additional Information
Primary Power Soul consumption
Notable Members Sebastian Michaelis
Claude Faustus (anime)
Hannah Annafellows (anime)
Timber (anime)
Thompson (anime)
Canterbury (anime)
Ciel Phantomhive (anime)

Demon (悪魔; Akuma, also translatable as Devil) is a supernatural being who occasionally comes to the human world to form a Faustian contract with a human, offering a range of services in return for the future consumption of the individual's soul.


Sebastian's Faustian Contract Seal.



A "pet" from the demons' world.

Demons consume on human souls, presumably for sustenance. They can do this by either forming Faustian contracts with humans or simply taking their souls forcefully. Human souls seem to differ in quality; Claude Faustus has once stated that a demon's - most likely those that nearly exclusively form contracts - life was to "cultivate a soul, and then feast on it", cultivate within the context taken to mean shaped.[1]

There are two aesthetics of demons: one, their masters' orders are absolute and two, obey those orders while keeping their contracts. These two aesthetics are the reason for most demons' actions. There is no faith or loyalty that prompts them to act otherwise. However, demons are highly afraid of breaking their aesthetics, this being why they value their masters' lives above their own.[2]

Placing the contract

Sebastian placing the seal on Ciel.

A contracted person receives a mark of their contract somewhere on his or her body, with a corresponding mark appearing simultaneously on the demon. The location of the mark can be chosen by the person who wishes to make a contract, or it can be the choice of the demon, as in Ciel's case. The more visible the location of the seal is, the stronger it is. Sebastian's contract symbol is on his left hand, and Ciel's symbol is on his right eye; in the anime, Claude Faustus' symbol is on his hand and Alois Trancy's mark is on his tongue. The contract mark is comparable to a scar or brand and allows the demon to be able to locate his or her master at any time. It gives the human great authoritative power over the contracted demon, but at the same time makes it impossible for him or her to ever escape said demon. Sebastian likens the contract to a "collar."[3] The placing of the seal is extremely painful.[4] The mark Ciel and Sebastian share is in the form of a pentacle, i.e. a five-pointed star inside a circle, with the magic ward "tetragrammaton" around it. In the anime, this would seem to be the standard design, as three different contract marks have been shown and all three were variations of a pentacle (in Hannah Annafellows' case, a pentagram). In marks placed by Sebastian and Claude, the star design appears inverted, that is with two points upward rather than one, traditionally a sign of black magic or devil worship in Western occultism.

In order to create the contract, a human has to summon a demon. However, it seems that they do not need to be aware of the existence of demons, attempt to summon a specific demon, or even summon one intentionally, as Ciel states he summoned Sebastian accidentally.[5] It seems that a human needs to have a lack of faith in God, and be desperately searching for a way out if Ciel's situation is indicative of a typical summoning process, or at the least an "accidental" summoning process. Sebastian states that once summoned, this fact will not change for all eternity. All the same, it seems that the human still has the option to go through and create the contract, or dismiss the demon, as when Sebastian was summoned, he asked Ciel to make a decision.[6] William T. Spears compares a demon's contract with humans to poking fun at them and then leeching anything that comes out as a means of survival, to which Sebastian replies he does not dismiss that claim.[7] Demons seem to be independent operatives. They contract on their own behalf, and there is no suggestion that they serve any supreme power nor any evidence that such an entity exists in the series (though there is reference to God).


Ciel Phantomhive as a demon only in anime.

While demons are physically capable of consuming human food, as shown through Sebastian's sampling of lemonade, cake, curry, and wine at various points in the series, it seems that only human souls are able to satiate their hunger. William states that refraining from consuming souls can leave demons "starving" to the point that they cannot help themselves.[8] This does not seem to negatively affect Sebastian, at least not in the same way starvation would kill a human, although Angela Blanc comments that his being starved causes him to feel more pain than normal when physically injured.[9] All the same, demons do seem to be able to be afflicted by problems similar to humans, such as when Sebastian complains of heartburn after drinking lemonade that contained MSG instead of sugar.[10]

Demons are said to be "devoid of love"[11] and lacking in convictions and loyalties.[12] Nonetheless, they have their principles, which include following their master's orders and maintaining the integrity of a contract.[12]

Demons also seem to have a long-standing hatred of Grim Reapers, which is illustrated through Sebastian's interactions with William T. Spears and Grell Sutcliff, particularly in the manga.[13] Grell sums this up by saying, "If the job of a Grim Reaper is to recover the souls of the dead, then demons can be likened to pests that snatch these souls away just for the sake of devouring them."[14] Sebastian, on the other hand, calls their use of the Cinematic Record "just a terrible interest" and the worst sort of spying activity.[15]

However, it is understood that, as far as demons go, Sebastian is not particularly harmful, as William states that he is "slightly better" than the others[7] and that he's "not the type to feast."[16]


Demons are shown to have a variety of abilities, including:

  • Enhanced strength: Demons are shown to be vastly stronger than humans. Sebastian was able to cause an entire concrete dam to collapse after one punch, rip the top of a train car's roof, throwing it effortlessly and stopping a moving train with one hand.[17]
  • Enhanced speed: Sebastian has demonstrated the ability to outrun a car that was attempting to speed away from him.[18] He is also able to block or dodge objects, such as his sword fight with Agni. He is also able to run to places in one hour that would take a day to get to by coach or railroad and outrun a moving train.[19]
  • Enhanced endurance: While fighting Grell Sutcliff, who was wielding his powerful Death Scythe, Sebastian was able to sustain multiple injuries from him and continue fighting while protecting Ciel. Sebastian is also able to survive attacks that would kill humans, such as when he was shot in the head and chest multiple times by Azzurro Vanel's men, get stabbed, slashed and even an arm severed yet continue on as if nothing had happened. However, more powerful weapons such as a Death Scythes can significantly weaken or even kill a demon.[20]
  • Enhanced senses: Sebastian is able to find humans based on smell, - including ones he has never personally met - is able to deduce if they are dead, alive, or injured and be able to discern if someone is a human or a member of another race, as shown when he quickly identified Agni as a human rather than a Grim Reaper, or even another demon. Sebastian states that he is able to pick up any kind of scent.[21] He was easily able to hear the rifleman who attempted to kill him, his abilities extending to the point where he could see each and every person who escaped from Violet Dorm after it caught on fire.  Demons also seem to be able to sense living souls.
  • Soul sensing: Demons can pick up signs of human life by sensing the humans' souls at long-range.[22]
  • Transformation: Sebastian has demonstrated that he can switch between his human form to his true demon form and back quickly. In this form, he effortlessly killed a Fallen Angel within ten seconds - at least in the anime - and caused an explosion when Ciel's soul was missing, devastating an island. It is questionable as to whether this is an ability all demons have. Claude also seems to be able to transform into the form of a spider. During Episode 4, Claude is seen having a long, inhuman tongue briefly. And at other points of time, Claude has spun and shot webs while still in human form. Also, in the manga it is implied several times that Sebastian can change his appearance at will, be it humans or creatures. He can also shapeshift his own body to weapons during the creation phase of his contract with Ciel. He was also able to take away his skin conditions from the werewolf's miasma by swiping his hand across a mirror.[23]
Sebastian fire

Sebastian uses his fire manipulation abilities.

  • Fire control: By revealing the sign of his contract, Sebastian is able to set an entire mansion on fire from three small candles.[24] It is unknown if this is an inherent ability or if it is a demonic ability derived from the Faustian contract.
  • Manipulation: Beyond making contracts for a human's soul, Sebastian has offered to make other deals or attempted to charm and manipulate people in order to get what he wants. William has called this the "signature" ability of a demon, and states that it works by "deceiving prey with sweet words and dragging them into darkness."[25] While ineffective against William, he later uses this ability to get Beast, who initially disliked Sebastian, to reveal important information.
  • Soul staining: It is not known precisely how this works or what it entails, but Grell states that a demon's hands and lips have the ability to stain a soul. This, however, could simply by a metaphor, as Grell is known to speak in extremely unorthodox language patterns.[11]
  • Body manipulation: Sebastian is shown to be able to twist someone's arm just by twirling his finger.[26]
  • Soul manipulation: Aside from consuming souls, demons can also manipulate human souls to certain extent such as implanting them in physical objects; In the Anime, Claude Faustus was able to steal Ciel's soul and implant it his personal ring which he also stole. He later implanted the soul of Alois Trancy into the latter's own personal ring after killing him.
  • Immortality: Sebastian has stated that demons can live forever, and they can heal/regenerate from any injuries, even if their entire bodies are destroyed. However, they can be killed by a Grim Reaper's Death Scythe.[27]
  • Manifestation: Sebastian was able to recreate the Phantomhive Manor, including the building itself and all of the furniture and decorating, in a matter of three hours.[28] He was also able to create a feast in an instant, as well as fill and entire tower of champagne glasses using far more champagne than a bottle could possibly have held. Sebastian also easily repaired Ciel's ring after Elizabeth destroyed it during a tantrum.[29] Likewise Claude completely redecorates the Trancy manor back to the way the previous Earl had it in the time it takes a party of guests to arrive, and later changes the color of the interior walls overnight.  Demons also seem to possess a great capacity for learning and retaining information, as shown with Sebastian quickly learning and excelling in cooking, art, language, music, etc.
  • Demonic conversion: In the anime, demons are shown to be able to convert humans into demons. Alois Trancy (while possessing Ciel's body via his soul being placed in him) ordered Hannah to not allow Claude or Sebastian to obtain Ciel's soul. Ciel was then reborn as a demon, waking with the signature pink-slitted eyes and withstanding a direct attack from Sebastian. It is not clear if this ability is available to all demons.
  • Levitation: It is shown that, when the first time Sebastian encountered Ciel, his feet weren't touching the ground.[30]

Known Demons

Demon contracts

Contracts: Sebastian (top), Claude (middle), and Hannah (bottom)

Known Contracted Humans


  • The word within Sebastian's contract sign, known as the tetragrammaton in English, is the Hebrew name of God. The most accepted pronunciation of the name is "Yahweh," but it is unknown what the proper pronunciation is. Most English translations of the Bible translate it as "LORD."[31]
  • Sebastian has been seen wearing a rosary, which would suggest that sacred objects (such as crucifixes, holy water, etc.) do not have a negative effect on demons.[32]


  1. Kuroshitsuji season 2, episode 6
  2. Kuroshitsuji Character Guide page 8
  3. Kuroshitsuji manga, Chapter 26, page 29
  4. Kuroshitsuji manga, Chapter 62, pages 4-6
  5. Kuroshitsuji manga, Chapter 36, page 13
  6. Kuroshitsuji manga, Chapter 19, pages 10-11
  7. 7.0 7.1 Kuroshitsuji manga, Chapter 12, page 24
  8. Kuroshitsuji manga, Chapter 12, page 28"
  9. Kuroshitsuji anime, Episode 20
  10. Kuroshitsuji manga, Chapter 1, page 12
  11. 11.0 11.1 Kuroshitsuji manga, Chapter 11, page 30
  12. 12.0 12.1 Kuroshitsuji manga, Chapter 13, page 27
  13. Kuroshitsuji manga, Chapter 26, page 27-30
  14. Kuroshitsuji manga, Chapter 11, page 26
  15. Kuroshitsuji manga, Chapter 10, page 11
  16. Kuroshitsuji manga, Chapter 35, page 17
  17. Kuroshitsuji II anime; Episode 2
  18. Kuroshitsuji manga, Chapter 3, pages 33-40
  19. Kuroshitsuji manga, Chapter 30, pages 22-23
  20. Kuroshitsuji manga, Chapter 10, page 12
  21. Kuroshitsuji manga, Chapter 30, page 29
  22. Kuroshitsuji manga, Chapter 74, page 10
  23. Kuroshitsuji manga, Chapter 91, page 3
  24. Kuroshitsuji manga, Chapter 34, page 23
  25. Kuroshitsuji manga, Chapter 28, pages 26-27
  26. Kuroshitsuji manga, Chapter 4, page 38
  27. Kuroshitsuji manga, Chapter 62, page 8
  28. Kuroshitsuji manga, Chapter 62, page 20
  29. Kuroshitsuji manga, Chapter 62, page 28
  30. Kuroshitsuji manga, Chapter 44, page 15
  31. Wikipedia:Tetragrammaton
  32. Kuroshitsuji manga, Chapter 67, page 22


Start a Discussion Discussions about Demon

  • How did Sebastian become a demon?

    5 messages
    • Jj the chihuahua wrote:You may have to do really cruel things in your previous life but refer back to the anime of how Ciel Phantomhive becam...
    • Phantomhive servant mine wrote:To become a grim reaper you have to commit suicide but how do you become a demon? You seem to imply there wa...
  • when was ciel a demon

    6 messages
    • snake is now on the anime well kind of
    • Ciel Phantomhive, was most likely NOT a demon at the end of the 2nd season. Most people say the last episode is not canon of the Anime. As for ...