1. #1Ajin

   Keys: ajin, demihuman, demi-human, demi human

   Ajin (AKA demihumans) 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.

   Abilities

   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 it is suggested that the only way it is possible would be because they possess an unknown matter (IBM) 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.[3] 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.

   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. However, this ability can be easily countered by simply wearing ear plugs or some other kind of noise dampeners.

2. #2IBMconstant

   Keys: Invisible Black Matter, IBM, Black Ghost, Ghost

   Theorized to be the main cause of all Ajin's powers, all Ajin possess Invisible Black Matter (IBM) which cannot be seen by normal humans, unless under specific circumstances (such as when an Ajin directs intense emotion towards a human). 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.

   IBM is what allows the Ajin to replace any lost body tissues or nutrients as demonstrated when IBM oozes from the body of an Ajin when they're fatally wounded or when they're manifesting their Black Ghost. The origins of IBMs are still unknown as are their composition; IBM's are made up of intangible unknown matter that originates from an Ajin's body. Each Ajin has a different amount of IBM but nonetheless they all regenerate at the same rate - the only difference that the IBM concentration makes is how frequent they can manifest their Black Ghosts.

   Black Ghosts

   Ajins also possess the ability to summon 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.

3. #3AASF

   Keys: government, Anti Ajin Special Force, Anti Ajin Special Forces, AASF, Anti-Ajin Special Force, Anti-Ajin Special Forces

   An elite team of highly capable, highly trained, cherry picked soldiers, their sole purpose being to subdue and capture Ajin. They are armed with specialized weaponry (using both tranq darts and live rounds as necessary) and wear gear specialized in countering Ajin abilities, like ear coverings to nullify their paralyzing screams, or thick but lightweight armor plates to defend against blows from IBMs.

   Their skill and teamwork is not to be underestimated. They work together in almost perfect sync, and will never lose their cool while working to subdue an Ajin.

   They use various strategic techniques to subdue Ajin, such as shooting them in rotation, perpetually killing them to prevent resurrection. Their aim is impeccable, and they are highly unlikely to miss a shot.

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