Massive Spoiler if you aren't caught up.

Name: Shigaraki Kyoki / Kuragari

Age: 19

Height: 228.6 cm

Physical Attributes: Peak Human

Quirks:

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Quirk Name - Brute Strength

Quirk Type - Emitter

Quirk Range - Close Range

Effect - When activated, the user gains immense physical strength that's powerful enough to smash through a reinforced concrete building, jump thousands of feet into the air, or move faster than sound. It is also said to passively increase the normal strength of the user over time.

Weaknesses - Strength does not equal durability. If a user were to use this quirk beyond their body's durability, they would destroy their body, leading to death.

Users - Kyoki/Kuragari, Shigaraki(former), Unknown person(former)]

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Quirk Name - Horror Vessel(This is the name used to classify all of Kyoki's original quirk)

Quirk Type - Varies

Quirk Range - Varies

Effect - Varies

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Quirk Name - Paralysis Scream

Quirk Type - Emitter

Quirk Range - Voice range

Effect - The user lets out a paralyzing scream that seizes the nervous system, paralyzing everyone in their immediate vicinity.

Weaknesses - Covering one ear would block the effects of the scream or not hearing it in general.

Users - Kyoki/Kuragari

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Quirk Name - Immortality/Revival/Resetting

Quirk Type - Emitter

Quirk Range - None/Self

Effect - The user is unable to die under any circumstances, such as being completely crushed, decapitated, or even due to malnutrition. The user with this quirk wounds begins healing immediately after a revival, which only takes a few seconds. However, they only begin to heal after dying or "resetting." Otherwise, their injuries will not heal immediately and will only heal at a natural rate. This resetting doesn't heal the physical deformities that the user was born with, as shown by Kyoki's hollow eyes.

The user also passively uses the biggest piece of a body part as a base and collects the smaller pieces for regeneration. However, pieces that are too far away are not collected and are instead replaced by growing new body parts. The leftover piece will then simply stop working. This has been shown multiple times by Kyoki.

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, a severed piece of their arm is removed from their body 100 meters away, and they can regenerate their entire being from that arm. This was mentioned by Kyudai, when he tested the Nomu he created with the cloned copy of this quirk.

Weakness - None

Users - Kyoki/Kuragari, Unnamed Nomu(Cloned version)]

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Name - Negative Ghost

Quirk Type - Emitter

Quirk Range - Long range

Effect: The user can summon a being known as a Negative Ghost. The ghosts are able to fly and are immune to all kinds of attacks, and should a person have a Negative Ghost pass through them or vice versa, they will immediately become very negative about themselves, and 9 out of 10 times, it will lead to suicide.

Weaknesses: Their number is based on the user's age, meaning the user can only summon 5 when they are five years old.

Users: Kyoki/Kuragari]

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Name - Vestige World/Black Ocean

Quirk Type - Emitter

Quirk Range - None/Self

Effect - The first property is the user's hollow black eyes, capable of sucking in the lifeforce and later soul into the Vestige World/Black Ocean, should anyone stare into their eyes.

The Vestige World/Black Ocean is a 'separate world' that exists within the user of this quirk. The world is filled with black water, also known as the Black Ocean. All the souls that have been transformed into Black Ghosts reside in this world.

If a soul enters the Vestige World, the Black Ocean transforms the soul into a black ghost. Using some black water to turn a soul into a Black Ghost reduces the size of the ocean, and if there isn't enough black water, the transformation fails, as seen with Shigaraki.

When a soul isn't transformed into a black ghost after a while, the other Black Ghosts residing in the vestige world will attack the soul to destroy it.

To increase the amount of water in the vestige world, people have to die next to the user, allowing them to absorb the remaining life force of the person into the vestige world and turn it into black water for the Black Ocean through their Hollow Black eyes.

~~~~Black Ghost:

Black Ghosts are souls that were transformed after entering the Black Ocean by the black water. Not much is known about the form they take when they transform.

All Black Ghosts also seem to have a will of their own and often mimic the 'core' personality of their host, as seen with how Kuragari obeys Ankoku since that's his core personality. They can continue regenerating as long as their host still has stamina.

~~~~Weakness: If they take too much damage, they disappear, or if the user runs out of stamina. As displayed by the Black Phantom.

Weaknesses - If a Black Ghost gets killed within the Vestige World, the black water that was used to create them floods back into the Black Ocean. This can often time lead to the Black Ocean overflowing, leading to the user feeling excruciating pain and might lead to death.

Users - Kyoki]

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Shigaraki Kyoki / Kuragari's overall weakness: Anthropophobia, Mental Instability, and Erasure (Eraser Head's quirk).

Villain Rank: S-Rank villain.

Kill count: 900,000 +

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And if you are curious, Overtone's quirk was the ability to control the sound of his heartbeat. By controlling it, he can make it sound like his voice and enhance it, giving the illusion that he is enhancing his own voice. By overlapping the sound of his heart over another sound and then silencing the sound of his heart, he can silence said sound. Think of it as putting on an invisible cloak to go invisible. He is putting his silence sound over a sound to make it silent... He displaced this when he silenced Theresa.

Weakness: Losing his heart.

In my opinion, this is the most interesting quirk I ever created.