Ajin

1. #1Ajin

   Keys: Ajin

   Ajin is another race of humanity. They look exactly like normal people, with the only things separating them from other humans being the fact they can generate Invisible Black Matter, or IBM, within their bodies, making them immortal.

   There is no known method to discern Ajin from humans apart from them dying and reviving. However, it's possible for one Ajin to discover another Ajin if that person sees their IBM. It's also possible for Ajin to make their Black Ghost visible to humans when Ajin feel extreme emotions such as rage and bloodlust.

2. #2Ajin discovery

   Keys: Ajin discovery

   Seventeen years before the beginning of the series, the Ajin were first discovered in Africa, when a soldier fighting on the battlefields rose from the dead countless times.[1] This earned him the name "Soldier of God (神の兵, Kami no Hei?)", and he soon became famous throughout the country he was fighting in. When word got out, an American government organization captured him and confirmed his immortality. While they tried to suppress this information from the public, it was simply too big, and it quickly became public knowledge.

3. #3Immortality

   Keys: immortality

   The defining trait of all Ajin is their immortality. They are unable to die under any circumstances, such as being completely crushed, decapitated, or even due to malnutrition. The exact mechanism of this is unknown but Ikuya Ogura suggested that the only way it is possible would be because they possess an unknown matter in their body which replaces any body tissues or nutrients lost.

   An Ajin's wounds begin healing immediately after a revival and it only takes a few seconds. However, they only begin to heal after dying, or "resetting", otherwise their injuries will only heal at a natural rate. This resetting doesn't heal physical deformities that the user was born with, however, as shown in Okuyama's case. This reinforced the statement that Ajin always return to their original state, even if that state is not 100% functional.

   An Ajin's body passively uses the largest piece of flesh as a base and collects the smaller pieces for regeneration. However, pieces that are too far away are not collected and instead replaced by growing new body parts. The leftover piece will then simply stop working. Notably, an Ajin can regenerate from a severed body part, no matter how far the location of that severed part is from the rest, but only if that body part is the largest part remaining of their body. For example, if their entire being is completely destroyed, and a severed piece of their arm that is removed from their body 100 meters away, they can regenerate their entire being from that arm.

   There is actually one way for an Ajin to die; as previously mentioned, an Ajin regenerates from their largest piece and leftover pieces that were severed will simply stop working. If an Ajin's head is chopped off and too far away to reattach itself, a new head will grow in its place and a copy of the Consciousness will manifest. The new Consciousness will have all the memories and personality of the original, but the original Consciousness will have died. The Original Consciousness will still be conscious of what is going on for a few moments. This is the only known way an Ajin to come to death, but that's only a theory that could be wronged. Although it has been theorized that an Ajin may also be able to die of old age.

   An Ajin uses the largest piece of flesh as a base and collects the smaller pieces for regeneration. However, pieces that are too far away are not collected, but replaced instead.

   An Ajin's body will always return to their original state, no matter the situation. If an obstacle is in the way (for an example a wall) the obstacle is broken apart without leaving nothing behind.

4. #4Paralyzing Scream

   Keys: Paralyzing Scream

   Ajin can also use a paralyzing scream that seizes the nervous system, paralyzing everyone in their immediate vicinity (its range is still unknown). Researchers think that this is a type of thanatosis reflex, which is why it works better on people who don't know about Ajin. Its effects on the targeted person can also be neutralized by the user if they wish to (as in the case of Nagai and Kaito). However, this ability can be easily countered by simply wearing ear plugs or some other kind of noise dampeners.

5. #5IBM

   Keys: IBM · Secondary: Invisible Black Matter

   Theorised by Ogura to be the main cause of the Ajin's powers, all Ajin shown so far possess Invisible Black Matter which cannot be seen by normal humans. This matter is what allows the Ajin to replace any lost body tissues or nutrients, but there is a more lethal way in which it can be used. Created using the IBM, a Black Ghost is a humanoid entity which is manifested by an Ajin and most commonly used for combat purposes. However, it should be noted that not all Ajin are able to materialize a Black Ghost and those who can are usually only able to do so once per day. There is also no known method of how an Ajin can properly materialize a Black Ghost although most of the characters in the series managed to manifest their Ghosts.

6. #6Black Ghost

   Keys: Black Ghost

   Ajins also possess the ability to manifest themselves into Black Ghosts. Black Ghosts and IBM are different in the sense that all Ajins possess IBM, but not all of them can manifest a Black Ghost. These Ghosts are made up of IBM and normally have a humanoid form but can have inhuman characteristics, standing at about over two meters tall. Each Ajin can manifest a unique Black Ghost. Ghosts are usually used for combat purposes, but they can also be utilized in other ways if their hosts know how to control them properly. They only have one weak point: their heads. Only a fatal blow to the head by another Ghost can destroy a Ghost. The connection between an Ajin and their Ghosts can also be hindered by water; analogous to how a cell phone's signal can be disrupted when there's heavy rain. If an Ajin and their Ghost's 'connection' are severed, the Ghost will vanish eventually.

   Ajins can manifest Black Ghosts when they're aware that they're Ajin (usually when they die), although Nakano hasn't manifested his Ghost despite dying multiple times already. When 2 Black Ghosts' heads make contact, the memories of the Ajins that own them also 'collide', resulting in a brief moment where their respective hosts are able to see a memory from the other Ajin. During this collision they also trade their mental states such as fear.

   These Black Ghosts also seem to have a will of their own and are shown to be quite intelligent. Black Ghosts often mimic the 'core' personality of their host, as seen in Nagai and Sato's cases. Black Ghosts can also mimic their host's speech as demonstrated by Sato and Kei. However, there are also cases where Black Ghosts are left to their own will due to their host's negligence to control them or failure to do so. One case included a farmer that left their Ajin to it's own will, and it eventually taught itself things such as farming or riding a tractor. If left alone for too long, it will be much harder to control them, as in Kei's case, who didn't know he had a Black Ghost for almost his entire life as he hadn't realised that he had died in the past.

   It is also possible for Black Ghosts to have wings, as in Takeshi Kotobuki's case. It is unknown whether or not this is possible for other Ajins as well due to each Ajin's Ghost being unique. Ikuya also suggests that Black Ghosts have the capability to change if their user are able to change their personalities. However, it is yet to be seen if it's actually possible.

7. #7Flood

   Keys: Flood

   In some cases of a flood nearby people who had recently died may be affected. During the Shinya Nakamura incident, Yūsuke died due to cardiac arrest despite being shot in the chest. The gunshots had healed but he couldn't reach the point of becoming an Ajin. In other words he was on the threshold. It is unknown if Yūsuke would have come back if he received CPR. A scientist from the US believes that this phenomenon is a hint to how Ajins are born but Ikuya Ogura argues that this is due to how strong the Ajin's emotions are at the moment of the flood.

   The IBMs created during a flood continuously act according to the emotion that triggered it's appearance. There was a case where a dutch gold medalist fell over and died right after reaching the finish line. The joy of victory combined with his revival caused a flood where the IBMs were rejoicing. The gold medalist attempted to order them to leave but they refused to listen. In Shinya Nakamura's case it was malice that triggered the IBMs and if any pedestrians were nearby they would have also been killed.

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