Quirk

Quirk
Information
Japanese Name	個 (こ) 性 (せい)
Rōmaji Name	Kosei
First Appearance
Manga Debut	Chapter 1
Anime Debut	Episode 1

A Quirk (個 (こ) 性 (せい) , Kosei^?, lit. "Individuality"), formerly known as a Meta Ability (異 (い) 能 (のう) , Inō^?, lit. "Extraordinary Ability"), is a superhuman power that a person can possess.

Along with being unique to each user, Quirks are sorted into multiple categories. Quirk users are also limited to only developing one power or set of powers and are thus unable to achieve any other through natural means.

History

The twin Shigaraki and their mother: The three first superpower users.

The earliest known instance of a human having superpowers was a prostitute who would later become the mother of the twin boys Zen and Yoichi Shigaraki. Her superpower was Spearlike Bones, but it only manifested as hardened growths on her left arm. She died during childbirth by a riverbank, her life force sucked away by the fetal older twin, without ever truly knowing about her ability.

The first Meta Ability officially recorded.

A year after her sons were born, the first superpower ever to be officially recorded was manifested by a newborn baby in Qing Qing City, China with the ability to radiate light from its body. After this phenomenon, many people around the world began to manifest different kinds of superpowers, not just at birth, but also during puberty. These powers became known as "Meta Abilities".

While the cause of this phenomenon is unknown, one research group looking into the matter hypothesized that it was caused by the spread of a previously unknown novel disease carried by mice, while others theorized that it was actually a natural evolution of the human race. However, to date, there is no hard evidence to support any of these theories. The aforementioned research group announced to the public that those with Meta Abilities were a subbranch of humanity with new genetic factors.

The advent of the Quirks led society into chaos.

The dawn of this extraordinary era was marred by a breakdown of society caused by the sudden onslaught of criminals, dubbed villains, empowered by their newfound superpowers, as well as ordinary people being prejudiced against the new minority. It suddenly became impossible to define one's self as a normal person, laws and human rights were thrown into constant debates, and the progress of civilization came to a sudden halt. The announcement by the researchers proved to be reckless and premature, as it caused division among people and chaos to grow. Meta Ability users were labelled as monsters or diseased, and as a result, Anti-Meta groups rose up with the objective of exterminating those with Meta Abilities.

All For One becomes a symbol of unity, gathering followers.

The Luminescent Baby took advantage of their fame as the first recorded Quirk user, attempting to rally a following that preached a return to a peaceful and stable society. They had 10 million followers at one point, but was later murdered by Zen, a powerful supervillain who would later be known worldwide as All For One, out of jealousy for all the attention and admiration they were getting.

As chaos and unrest ensued due to the outbreak of Meta Abilities, ordinary civilians decided to take matters into their own hands to bring order to society, and thus the first "heroes" appeared in the form of vigilantes, beginning the Vigilantes Era.

During this time period, All For One became a symbol of unity in society. He used his own Meta Ability to remove Meta Abilities from those who did not want them and give them to those that did. He claimed his actions were meant to help return society to its prior state, when in reality, he was gathering followers who were loyal to him, allowing him to act out his ulterior motives.

A mother's unconditional love led to the birth of the term "Quirk".

At some point, a woman gave birth to a son named Chikara Yotsubashi. As Chikara grew up, he faced a lot of discrimination and abuse for having a Meta Ability. His mother supported him, stating that her son's Meta Ability is "just a Quirk of his". Although at the time, her message was scorned and even led to her murder, decades later, "Quirk" became the most common term for such Meta Abilities, and she retroactively became known as The Mother of Quirks.

As society adapted to the new status quo, the Police Force moved to prioritize leadership and to maintain the status quo, and as such, decided not to use Quirks as weapons. To fill that void, the profession of crime-fighting Quirk users, Pro Heroes, began to exist, starting in Rhode Island, USA, which caused the vigilantes to slowly disappear. Authorizing the use of powers that could so easily kill, however, was a greatly criticized decision at first, but eventually became accepted as a legitimate occupation. This became known as the "Advent of the Extraordinary" (超常黎明期, Chōjō Reimeiki^?, lit. "Dawn of the Paranormal").

Destro preaching that Quirks should be used freely.

With the proliferation of Quirks, the government began to regulate their use. A group of Quirk users known as the Meta Liberation Army, led by Chikara under the alias, Destro, had tried to stop the passing of regulations that would restrict Quirk usage, believing that free use of Quirks is a basic human right. They rebelled against the governments of a number of nations for several years before meeting their defeat. Chikara himself was imprisoned and wrote a biographical book, Meta Liberation War, detailing his ideals over liberating Quirks. After getting his writing published, Chikara committed suicide, but his legacy would continue over the years with members and supporters of the Meta Liberation Army operating from the shadows.

Currently, roughly 80% of the people who make up the global population possess a Quirk, and that percentage continues to increase. According to Yoichi, the number of individuals without a Quirk has been rapidly declining in population, indicating that now less than 20% of the world's population is Quirkless (無個性, Mu Kosei^?, lit. "No Individuality").

Information

The exam that diagnosed Izuku Midoriya as Quirkless.

Quirks are said to be the next stage of evolution in the human race. It is possible, though rudimentary, to diagnose a person as possessing or lacking a Quirk by analyzing the presence or absence of an extra joint in their pinky toe. People with only one joint tend to develop a Quirk, while having two joints usually indicates that the person is Quirkless. The lack of the extra joint makes a person's body more "streamlined", a secondary aspect of human evolution brought about by the emergence of Quirks.

A person's Quirk will normally manifest anytime before the age of four, sometimes even straight after birth, such was the case with Present Mic and the Luminescent Baby, although there are late bloomers who don't develop their power until a bit later in life. There are also records of people not developing their powers until they hit puberty, and Izuku Midoriya was able to hide the truth of receiving One For All by claiming that he was a late bloomer, showing that it is possible for someone not to develop their Quirk until their teenage years or perhaps even later. In one very early case in the history of Quirks, Yoichi's Quirk Bestowal did not make itself known for most of his life due to his malnourished body causing it to be weak and unformed, leading to the belief that he was Quirkless.

Eijiro's Hardening Quirk first manifesting as a child.

A Quirk's manifestation tends to happen very suddenly, often to the child's surprise. Eijiro Kirishima's Hardening Quirk first manifested in the middle of the night when he needed the toilet, and resulted in one of his hands accidentally cutting his right upper eye. That said, there can be precursors to a Quirk manifesting as well, such as Tenko Shimura feeling a sudden pain in one of his arms the evening before his Quirk fully manifested.

While Quirks are unique from person to person, some powers are more common and widespread than others, such as fire or water manipulation and the power to grow to gigantic sizes. On the other hand, Quirks such as spatial warping and regenerative healing are very rare.

A multifaceted Quirk that grants Tsuyu the abilities of a frog.

Furthermore, not all Quirks are singular abilities, as there are some that can have multiple powers. Lady Nagant's Quirk, Rifle, allows her to protrude a rifle from her right elbow, but she can also mold pieces of her hair like epoxy putty and shape them into any kind of bullet. Tsuyu Asui's Frog Quirk gives her the physiology of said creature, granting her the many abilities of a frog, such as an extendable tongue, great leg strength and leaping ability, camouflage, etc.

In rarer cases, a single Quirk can take the form of multiple abilities that are completely different from each other, giving the impression of having more than one Quirk; Shoto Todoroki possesses a Quirk that is a perfect combination of his father and mother's fire and ice powers respectively, essentially giving him two Quirks in one. Valdo Gollini's Alchemy Quirk gives him the impression of possessing many different abilities (being able to transform coins into various objects, manipulating the earth, launching glowing projectiles, and even modifying his own appearance) but is really a single overpowered Quirk that can transmute the matter of any non-living thing Valdo touches.

Fumikage's Dark Shadow is an example of a sentient Quirk.

It is even possible, albeit quite rare, for some Quirks to take the form of sentient beings that are connected to their users. Fumikage Tokoyami's Dark Shadow grants him a dark creature that lives inside his body which is capable of speaking and acting by itself, even going against its own user's command on occasion. Rody Soul's eponymous Quirk gives him a small bird-like companion named Pino, who acts based on his innermost feelings.

Quirks are extensions of a person's bodily functions. As such, they can be trained and worn out. When a person works out their muscles, the muscle fibers are destroyed and new, stronger ones grow back; this same rule applies to Quirks. However, should a Quirk be overused, the user could suffer any of a variety of drawbacks, depending on the nature of the Quirk. These drawbacks are usually simple ailments, such as dry skin or nausea; however, in some cases, the drawback can be much more severe.

Dabi's body unable to handle his own flames, resulting in permanent burns and scarring.

The body of a Quirk user has natural adaptations to protect itself from any damage the Quirk might do to them without these natural defenses. For example, someone who can breathe fire does not burn their mouth when using their ability. However, there are instances where a Quirk doesn't suit the user's body and the body can't handle it. Such conditions can be bypassed through the use of support equipment, such as Yuga Aoyama's belt.

Some people have bodies that are not properly suited for their Quirk, such as Toya Todoroki, who inherited his mother's tolerance for freezing cold, rather than his father's tolerance for high heat, causing him to easily get burned by his own flames, even being warned by a doctor that he shouldn't use his Quirk for his own well-being. Some people, have Quirks that are simply too powerful for their body to handle; a notable example is Nine, whose Weather Manipulation Quirk caused him to suffer a massive strain on his body when used, resulting in excruciating pain and cellular degeneration.

Some Quirks can even be more of a curse than a superpower to their users. Takeshi Bushijima's Poison Gas causes toxic fumes to accumulate inside of his body, causing Takeshi to become severely ill and being forced to release the gas for the sake of his health. This led to the young man accidentally poisoning several civilians and being mistakenly labelled as a villain. Anna Scervino's Overmodification caused her to hurt anyone she made physical contact with and plagued her life with painful seizures that required a Neutralization Quirk to remedy. Because of this, Anna struggled with living a life at all without the help of her butler, Giulio Gandini, even desiring to be killed so she wouldn't lose herself to her Quirk and harm anyone else. In both these cases, Takeshi and Anna's Quirks caused them perpetual pain and just not using them wasn't an option.

Young Himiko fascinated by gore due to having a blood-based Quirk.

Quirks are known to have a direct influence on the user's personality. For example, Himiko Toga, whose Quirk allows her to transform into a lookalike of anyone whose blood she drinks, caused her to have an obsession with blood and gore, even when she was a child, as well as an unyielding desire to become like the people she admired. While a Quirk's influence on personality can cause the user to have trouble fitting in with others, it does seem to allow the user to use their power more naturally and effectively; Himiko's obsession with blood allows her to use her Quirk and drink blood without feeling disgusted, and without her conscience getting in the way.

Another facet of Quirks is that they are affected by the user's emotions, given that they serve as a part of their physiology. This applies to some Quirks more than others, such as Blackwhip being empowered by intense emotions such as anger and hatred. Some Quirks can even be based on certain emotions entirely, such as La Brava's Love, which allows her to grant a power boost to the person she loves by confessing her feelings to them.

Nezu is a prime model of an animal with a Quirk.

Quirk Levels can be measured, though only All Might's have ever been shown, being at 15,000 AP at his peak and reaching a low point of 2,500 AP in the present.

Although very rare, it is also possible for animals to possess Quirks, such as Nezu's High Specs, which gives him above-human intelligence, the Monster Cat's eponymous Quirk, which allows it to fuse with and control objects while amplified by Trigger, and Kuin Hachisuka and Bee☆Pop, two parasitic bees whose Quirk, Queen Bee, allows them to control a hive mind of other bees as well as possess the bodies of individual humans.

Vestiges

One For All, a perfect example of Vestiges in the mindscape of a transferred Quirk.

Every Quirk contains an echo of the consciousness of its wielder, known as a Vestige (面 (おも) 影 (かげ) , Omokage^?). If a person's Quirk is transferred to someone else, the consciousness of the previous wielder will appear in the new user's mind, either as voices in their dreams or as manifestations in a mental mindscape. This phenomenon is compared to cases of people whose personalities and tastes changed after an organ transplant. If further transferred to yet another new user, then that new user will experience the consciousnesses of all of the previous users, though these consciousnesses will disappear if the new user loses the transferred Quirk.

All For One's Vestige restraining Tomura.

While not much is known about these consciousnesses and what they do, they are seen to hold the same personality and memories of their original users up until they are transferred to someone else. It is shown that these Vestiges (who have been transferred to other hosts) can potentially act or override the new host body they reside in. All For One's Vestige himself holds such an immense will that he was capable of controlling Tomura Shigaraki for a lengthy time, being the only Vestige capable of such an act. During All For One's battle against Endeavor, Hawks, Earphone Jack, and Tsukuyomi, the Vestiges inside him were capable of temporarily rebelling against the villain and hindered him until he consumed them to regain control. Later, nearing the end of his Rewind Drug-induced rampage, Hawks' Vestige was able to help stir the other Vestiges to regain control and rebel once again.

The Vestiges rebel against All For One.

The Vestiges of One For All within Izuku, after a direct encounter with All For One, could freely communicate with their wielder, giving him advice and able to hold full conversations. During the battle between Koichi Haimawari and Number 6, it's implied that an ember of Iwao Oguro's Vestige briefly spoke with All For One despite him transferring Iwao's Overclock Quirk to Number 6. However, a Vestige could be suppressed if the host's body overwhelms them with their own will, as Tomura did with All For One's Vestige while seizing back control of the Quirk itself. A Vestige may also be potentially destroyed if enough damage is done to them or the Quirk itself. The Vestige of Star and Stripe's New Order was completely eradicated following its self-destruction during her battle with Tomura, though a small ember of it remained to aid Izuku and the One For All users against Tomura.

In a similar spectacle, a Vestige of Himiko remained in Ochaco Uraraka's mind after the villain transferred all her blood into Ochaco in order to save her life. Eight years later, Himiko's Vestige appeared in Ochaco's dreams, with Ochaco speculating that even long after Himiko's blood had mixed with her's, a part of Himiko remained inside of her and likened it to the Vestiges inside One For All.

Quirk Factors

The strain of possessing multiple Quirks can cause a person to become mindless.

Quirk Factors (個性因子, Kosei Inshi^?, lit. "Individuality Factor"), also known as Plus Alpha Elements (+ (プラス) α (アルファ) な仕 (し) 組 (く) み, Purasu Arufa na Shikumi^?), refers to the collective physical and genetic traits that compose a person's Quirk. This includes the primary Quirk power, as well as the specific body parts that allow said primary power to function properly. For example, Kyoka Jiro's Earphone Jack is located in her earlobes, so her Quirk Factors are her ears.

Under special circumstances, a second Quirk can be added to a person's genetics. However, gaining multiple Quirks often puts immense strain on the inheritor, turning them into mindless living dolls incapable of speaking. It was once thought that a person could only endure two Quirks if they were physically fit, as was the case with One For All users, but it turns out that they, too, suffered from the backlash of carrying two Quirks, resulting in a considerably reduced lifespan.

Hikage Shinomori having suffered from accelerated aging due to the burden of having two Quirks.

Presently, All For One, Gigantomachia, Lady Nagant, and Izuku are the only known people to have been able to wield multiple Quirks without suffering from this Quirk overload. On the other hand, Number 6, Nine, and Tomura have been able to achieve this feat through heavy modification on the body and mind. It is potentially possible that a Quirk that can heal the body or provide more energy to the user can supersede the negative effects of holding multiple Quirks, as seen through Gigantomachia's Endurance, Tomura's Super Regeneration, and Nine's attempt to claim Cell Activation. There is also a rare chance that the initial Quirk and the bestowed Quirk may merge together, becoming a new singular Quirk, as was the case with One For All following the fusion of Quirk Bestowal and Power Stock.

Warp Gate: A Quirk that was artificially created.

It is also possible for a Quirk Factor to not only be extracted from the body, but also replicated, enhanced, and created. Doctor Kyudai Garaki developed a way to duplicate Quirk Factors, allowing multiple individuals to possess the same Quirk. He had also obtained a large collection of various different Quirk Factors, both through duplication and extraction from the original body, which through a procedure could be forcefully implemented into a body, as shown through the Nomus. Experimentation can also result in a Quirk Factor evolving into something new, as was the case with Teruo Unagisawa's Eel becoming Electric Eel. Artificial Quirks can be created through the combination of multiple Quirk Factors, as seen through the creation of Kurogiri's Warp Gate from the base of Oboro Shirakumo's Cloud and several others. Artificial Quirks can also be created based on removing certain aspects of the original Quirk; Decay was created as a copy of Kai Chisaki's Overhaul, but with the restoration attributes removed, leaving only the destruction ability.

The expression of Quirk Factors interrupted.

Certain Quirks, such as Erasure, Erasure Spot, or Neutralization, are capable of temporarily halting the expression of the Quirk Factor, rendering the Quirk unusable for a short period, but not affecting the Quirk Factor otherwise. There are other Quirks, however, that are able to directly damage the Quirk Factor of a target, preventing the Quirk from being activated until the user manages to naturally recover. An example of this is Hawks' Fierce Wings, which was heavily damaged by Dabi's Blueflame, limiting his Quirk's usage. Even after Hawks' wings were healed by Recovery Girl, they couldn't be fully restored, forcing him to rely on prosthetics to try to reach his Quirk's original full potential.

It's possible that a Quirk Factor can be damaged beyond recovery, causing the Quirk to be permanently suppressed. The first instance was when Eraser Head was severely injured by the U.S.J. Nomu. Eraser Head's body sustained a large amount of damage, especially his face and head, and this caused his Erasure Quirk to have a much shorter time limit, as he has to blink more often because of the damage he took. His Quirk's usage was further worsened when he lost his right eye completely during the Paranormal Liberation War, making his Erasure nearly useless.

With his arms destroyed, it is impossible for Kai to use his Quirk.

Another instance of a Quirk Factor damaged beyond recovery was when Overhaul had his arms destroyed by Mr. Compress and Tomura, making him unable to use his Quirk anymore, as his arms were his Quirk Factors. There is also the Quirk-Destroying Drug, which can temporarily or permanently (depending on the variant) destroy the users' Quirk Factor, losing their ability to utilize said Quirks.

It has been shown that destroying a person's spirit would also destroy their Quirk. After All For One seemingly destroys Tomura's spirit and gains back control of his body, he notes that Decay got destroyed alongside his rage and hatred due to Izuku attacking his soul.

Heredity

An example of Quirk heritage of two families.

Quirks are inherited genetically through what appears to be Mendelian inheritance. A child will either inherit the father's Quirk, the mother's Quirk, or a completely new Quirk formed by a fusion of the two. Depending on the parents, this new Quirk may sometimes give the appearance of the person having two separate Quirks, such as Shoto's Half-Cold Half-Hot. While the inheritance of Quirks appears to be recessive, there is a small possibility that two people with Quirks will have a Quirkless child, as was the case with Izuku.

Naturally, since Quirks are inherited genetically, siblings tend to have the same or very similar Quirks. Fuyumi and Natsuo Todoroki both possess their mother's Frost Quirk with no apparent differences between them. The Three Sturm und Drang Brothers all possess the exact same Glide and Slide Quirk and are hinted to be triplets, implying that children who shared the same womb can inherit identical Quirks. Meanwhile, the Ida brothers possess the Engine Quirk, with the older brother, Tensei having engines in his arms, while the younger brother, Tenya, has engines in his legs. Engine seems to be dominant in terms of inheritance, having persisted for at least three generations without being masked or altered by other Quirks.

The Ida Family, which shares the Engine Quirk.

Quirks in families can also have similar functions but be expressed in different ways. Although both Zen and Yoichi have Quirks with the functions of absorbing and holding Quirks, the two Quirks are very different to the point of being opposites. All For One could take and give the Quirks of others but itself could not be passed on. Yoichi's Quirk could be passed onto others and imprinted the Quirks of those that had possessed it. Coincidentally, Zen and Yoichi were also twins, though the former sapped most of his mother's nutrients, causing Zen's body and Quirk to be strong, whilst Yoichi was physically weak and his Quirk remained unformed for most of his life.

In rare cases, a child may manifest a Quirk that is completely different from anything in their genetic lineage, akin to a mutation, such as Eri's Rewind and Koki Terumoto's Darkness. These Quirks are deemed as "variants" and are shown to be treated as especially unnatural. Eri's Rewind unintentionally reverted her father out of existence, causing the girl to be disowned by her mother, while Koki's family reacted extremely negatively when his Darkness first manifested, to the point where they all turned on him and locked him away in their house's basement.

Physical abnormalities caused by Quirks can be passed on to the next generation, even if the Quirk that causes the abnormality is not passed on; Fumikage has a bird-like head that has nothing to do with his Dark Shadow Quirk, Koji Koda has a jagged, rock-like head with no relation to his Anivoice Quirk, and Mina Ashido has a pair of horns and eyes with black sclerae that have no effect her Acid Quirk. Notably however, all of these changes have had their relation to the user's Quirk called into question; Fumikage's bird head is expressed in his Dark Shadow, Koji's rock-like head grows into a horned protrusion that allowed him to telepathically issue commands using Anivoice, and Mina's horns and sclerae both change when overusing her Acid.

Quirk Marriages

The only shown perfect child of a Quirk Marriage.

Since Quirks are passed on from parent to child, some people had taken to marrying a partner based on their Quirk, what's known as Quirk Marriages (個性婚, Kosei Kon^?, lit. "Individuality Marriage"). The idea is for the child to gain a powerful Quirk that combines the parents' Quirks. A popular example of this is Shoto and his Quirk, Half-Cold Half-Hot, which is a combination of his father's fire Quirk, Hellflame, and his mother's ice Quirk, Frost. Powerful combinations, while possible, are not fully guaranteed, however, even from strong parents, seeing as Shoto was the only one of four siblings to have a powerful combination of the parental Quirks without experiencing downsides. Due to the concept of creating children solely for the sake of experimenting with powers, Quirk Marriages were quickly deemed as unethical by society. Nowadays, they are regarded as a taboo and outdated practice.

Awakening

Himiko discovers she can use another person's Quirk.

After the initial manifestation of a Quirk, it is possible for the user to undergo an "Awakening" (覚醒, Kakusei^?) later in life. The right emotional catalyst can cause Quirks to evolve (飛躍, Hiyaku^?) on the spot, usually requiring the individual to experience intense feelings of stress, like that of a life-or-death situation. This results in one's Quirk gaining a new level of strength and/or new aspects to its nature that were previously not possible.

People whose Quirks underwent an Awakening include:

• Himiko Toga, whose Transform Quirk evolved to allow her to use the Quirks of people she transformed into. This is first shown when she uses Zero Gravity while she had taken the form of Ochaco Uraraka.
• Geten, whose Ice Ply Quirk evolved to be able to control the temperature of ice after Re-Destro burned himself.
• Tomura Shigaraki, whose Decay Quirk dwindled in power and potency after accidentally killing his family when it first manifested. During his fight with Re-Destro, his power underwent a Re-Awakening as Rikiya described, not only increasing in power and removing the restriction of needing all five fingers to be on the target for the Quirk to take effect, but also expanding its lethality by spreading to anything and everything the rot comes in contact with.
• Katsuki Bakugo, after a near-death experience upon being skewered by Tomura's Rivet Stab, went through an Awakening causing his Explosion Quirk to become stronger, faster, and more condensed than usual, resulting in the development of Cluster. This later allowed him to create explosions across his entire body using Cluster, increasing his speed and mobility while removing the need to use his hands to do so.
• Koji Koda, during the siege on Central Hospital, had his horns grow in as his Quirk awakened. This expanded his Anivoice's effective range, in which he can reach out and control animals, enabling him telepathic commandeering over having to issue verbal commands.
• Ochaco Uraraka, after Himiko grievously injured her, underwent an Awakening, allowing the anti-gravity effects of her Zero Gravity Quirk to spread from one target to others she didn't touch in a domino fashion. In addition, Ochaco's Awakening removed her weight limit of three tons. She can generate gravitational bubbles that make anything they touch float, while removing the need to physically touch her opponents or objects.
• Yuga Aoyama underwent an Awakening that strengthened his Navel Laser Quirk following his injuries at the hands of Kunieda, which made his laser beams faster and more potent, even to the point of causing Toru Hagakure's Invisibility Quirk to glitch out.

While never referred to as an Awakening, Izuku unlocked the ability to use the other Quirks of One For All starting with Blackwhip, which was also triggered by intense emotion and represented a fundamental evolution of the Quirk, similar to an Awakening.

Awakenings are typically considered very rare, to the point that not even All For One could comprehend the concept as he witnessed the battle between Koichi and Number 6, noticing the two exhibit such incredible power and resilience with their Quirks that he believes shouldn't be inherently possible. Koichi demonstrated his Slide and Glide's Awakening as a result of his many years of vigilantism, turning him into a "variant fighter" that could instinctively utilize his Quirk in numerous of previously unknown applications, defensively or offensively, while Number 6 used his augmented body and multiple Quirks to overload each of his abilities to their extremes.

Dabi's ice Quirk manifests while on the verge of death.

In similar cases to Awakenings, it's possible for one to summon an absurd amount of power in a crisis when they are at death's door. An example of this is Izuku, who, after nearly being crushed to death by Muscular, managed to rise to his feet and operate at 100% of his power for an extended period of time, allowing him to send the villain flying with 1,000,000% Delaware Detroit Smash. Another example of this is Dabi, who after overusing his Blueflame Quirk for an extended period of time, despite it burning himself to a crisp, was able to manifest the ice from his mother's Frost Quirk, increasing his power's capabilities while being minutes away from death.

Quirk Singularity

The next generation possessing stronger Quirks.

The theory of the Quirk Singularity (個性特異点, Kosei Tokuiten^?, lit. "Individuality Singularity") is a popular line of thinking that suggests that Quirks will continue to mix together and deepen, growing in both strength and complexity with every new generation. Eventually, Quirks will develop to a point where no one will be able to control them anymore.

This idea was first theorized by Kyudai, who started to see early signs of this phenomenon among the fourth generation of Quirk users. However, with the exception of All For One, no one believed his theory, and he was ostracized from society as a result.

Humarise, the global anti-Quirk cult.

This theory is first mentioned by Seiji Shishikura when Present Mic notes how the Masegaki Primary School students have very powerful Quirks and have much better control over them than he did at that age. He also mentions that in this current era, the theory is viewed as fringe thinking, and is primarily followed by some cultists. One of these cults, Humarise, were so indoctrinated in this belief that they committed mass terroristic acts all in service of culling the Quirk population to prevent what they believe to be the end of the world. Quirk users also joined the cult, whether that's due to a hatred for their own Quirk, giving their power and life to the cause as "penance", or simply to save their own skin.

The Quirk Singularity was eventually proven true as a result of Tomura obtaining the All For One Quirk. His body began to morph and reshape to an absurd degree to reach its optimal shape that represented the user and the amount of power that resided within his body.

Quirk Duplicates

Tomura Shigaraki undergoing a Quirk transplant surgery.

It is possible through advanced scientific means to copy a person's Quirk and preserve it in a container, allowing the possibility of transferring said ability to another individual. The exact process and requirements involved in Quirk duplication are unknown, but Kyudai has insinuated that it takes a great amount of time just to replicate a single Quirk, let alone the countless ones he had stored away in his secret laboratory.

Quirk Duplication is believed to have great potential in benefitting humanity, with Present Mic stating that it could have been applied to regenerative medical care and likens it to using "cheat codes".

The process of artificially transferring a Quirk to another person requires a complex surgery, whereas the individual is rendered in stasis while the Quirk is implanted into their body. Since the strain of possessing more than one Quirk can cause the user serious problems, such as heavy drawbacks to the body, accelerated aging, or even inducing a mindless state, a person who undergoes such a process must have a body that is strong and conditioned enough to receive another Quirk, while also being compatible with the respective Quirk Factor.

A duplicate Quirk will possess the exact same abilities as the original, though not always to the same extent and quality. The Quirk-stealing ability, All For One, has been duplicated twice and both variants are more limited in usage than the original. Nine's version of All For One only allowed him to steal up to 8 Quirks, while the Villain All For One's copy of the eponymous Quirk does not grant him the same level of command over his stolen Quirks, allowing the vestiges of their past users to resist and hinder him from within. Decay, a modified copy of Overhaul, lacks its reconstructive abilities and initially its speed. However, due to its Awakening, it has properties Overhaul never had, such as solipsistic destruction.

So far, Kyudai is the only known person who is capable of duplicating Quirks, as well as transferring them artificially.

Quirk Restriction Laws

Koichi being scolded for using his Quirk in public.

In an effort to preserve order in the superhuman society, there are several laws and procedures in place to ensure the conscientious use of Quirks. Public display of Quirks is against the law, as is using them with the intention to harm other people, except in cases of self-defense, such as when one is under attack or preventing someone else from being attacked.

Since the vast amount of different Quirks can range from harmless to lethal, it is impossible to account for every single Quirk in the law books, leading to the simple strict banning of using one's Quirk to commit bodily harm. Despite this, the notion of Quirks not being used in public is sometimes ignored or overlooked, being compared to an old rule of not riding bicycles on sidewalks, although doing so would still be an infraction of the law. Certain Quirks also have more regulations than others to prevent their abuse, like Camie Utsushimi's Glamour.

Citizens are required to have their Quirks registered with the government. It is possible for the details of a person's Quirk registration to be changed, as it is quite common for people to discover new things about their Quirk that they were previously unaware of. However, major and frequent changes are usually not allowed. It is unknown whether Quirks are generally named by the government, the Quirk user themselves, or their parents and guardians, but it appears to be a mixture depending on the circumstances, an example being All For One giving both himself and his Quirk that name, based on a line from the Captain Hero comic book series.

Koichi's "Slide and Glide" Quirk redubbed as "Flight".

However, Quirk names can also be changed if necessary. One For All is registered for Izuku as "Super-Power", though whether that was his choice or the government's is unknown. Koichi's Slide and Glide Quirk was renamed as "Flight" after the latter moved to America and became Captain Celebrity's Sidekick, The Skycrawler. Dabi's Quirk is officially registered as "Blueflame", but since he's never heard referring to it by that name, and considering his true identity was hidden for years, along with the fact that his flames originally burned red like his father's Hellflame, it's likely that Toya's Quirk had a different name registered prior to becoming Dabi.

During elementary school, children receive Quirk counseling in order to learn how to use their powers responsibly and to help support their growth, since a young child's Quirk can have a large effect on their self-esteem. Quirk counseling can also be intended to correct and reform any "deviant" behavior that is caused by one's Quirk.

Despite this, Quirk counselling is not a cure-all and is not always met with success. Curious even highlights the major flaw with Quirk counselling is how it tries to forcibly correct any abnormalities present in children's Quirks, pressuring them to get rid of their differences rather than accepting them. Himiko is a key example of this, as her fascination with blood was deemed as abnormal during her childhood and being forced to suppress this trait led to her mental instability, eventually causing her to become a Villain.

In the following eight years, an expansion to Quirk counseling is started by Ochaco, with her and her fellow Pro Heroes touring elementary schools around Japan, wishing to make Quirk counseling more accessible and likely intending to give children better guidance with their abilities.

A Provisional Hero License.

Aspiring Pro Heroes undergo special education during their high school careers and receive licenses that give them the authority to use their Quirks freely. Only licensed Pro Heroes or heroes in training with Provisional Hero Licenses are allowed to use their Quirks for things such as rescuing people or to commit bodily harm by attacking villains.

Using one's Quirk to do such things while unlicensed is illegal and punishable by law, sometimes through hefty fines, as seen with Danjuro Tobita, whose parents were forced to pay for him using his Quirk without a license, as well as unintentionally intercepting a Pro Hero from rescuing a falling victim. In other cases, illegal usage of Quirks can be labelled as acts of vigilantism or even villainy and can be met with dire consequences.

The confidentiality of All Might's Quirk resulted in One For All being "one of the seven great mysteries of the world".

When it comes to heroes, it is also possible for the specifics of their Quirks to be kept classified by their nation's government. An example of this is All Might, whose Quirk was kept secret to protect the truth of One For All. This led many people to assume it was simply a super strength or invulnerability Quirk, while many others theorized endlessly as to what his Quirk could actually be. A similar notion applied to America's No. 1 Hero, Star and Stripe, and her New Order Quirk, which was kept strictly confidential under the U.S. government, although civilians gained a rough idea of what it was from seeing her in action in the field, with her being able to apply a rule of her choosing to anything she touched and called out the name of.

Additionally, it is also possible for regular workers to use their Quirks provided they have the proper permissions and licensing. Izuku said that Ochaco could use her Zero Gravity to help with her parent's construction company by reducing prices on heavy lifting if she managed to get her Quirk licensed. Furthermore, electricity-based Quirks are said to be highly valued in the job market, which is why Heroes with electric Quirks are quite rare. A person's Quirk can even play a big role in their employability status, as seen with Recovery Girl, a Pro Hero who also works as a nurse at U.A. High School. Her Heal Quirk is exceedingly rare and valuable, causing her to journey to different hospitals around Japan to provide healing services. On the other hand, Tenko Tejina was turned down from multiple jobs due to how easily his Conjure Quirk could be used to steal things.

Quirk Types

Quirks come in a very wide variety, as the name "Quirk" implies they are unique to each individual. However, Quirks can be divided into categories based on what they do and how they function, known as Quirk Types. Some Quirks cause a permanent physical abnormality to the user's body, known as Mutant-type. Some cause the user's body to undergo a temporary physical abnormality when the power is used, known as Transformation-type. Finally, some Quirks don't cause any abnormalities to the user's physical body at all, known as Emitter-type.

Although Quirks are officially classified into just one of three main types, they can exhibit traits of multiple categories. This is especially common with Mutant-type Quirks, which often display characteristics of either Emitter or Transformation-types as well. For instance, Mina and Jurota Shishida possess Quirks classified as Emitter and Transformation-types, respectively, yet both display permanent physical traits typical of Mutant Quirks. Mina's skin is naturally resistant to acid, complementing her Acid Quirk, while Jurota has a permanently hairy body and fangs due to his Beast Quirk, which gives him a naturally hairy body providing insulation against and bite-based offense.

Aside from the three Quirk Types, Quirks can also be categorized into sub-types. A Quirk can fall into a given sub-type regardless of what type it is. In other words, a given sub-type can be designated to Quirks of all three types, so long as the Quirks possess an aspect that fulfills the requirement to be considered as part of that sub-type.

Known Quirk Types

Emitter

Denki Kaminari emitting electricity with his Quirk, Electrification.

Emitter (発動, Hatsudō^?)-type (also called Operative) Quirks are abilities that allow the user to generate and possibly control certain things, or alter existing things around them in certain ways. The emissions of Emitter-type Quirks can have a wide variety of properties and abilities.

Emitter-type Quirks, such as Brainwashing, Explosion, and Half-Cold Half-Hot usually require a conscious effort to activate, and some, such as Erasure, even require large amounts of concentration in order for them to remain active.

Emitter-type Quirks can also have various ranges. While some users require physical contact to use them, others can have much longer ranges with no distance restrictions.

While most Emitter-type Quirk users generally have a handle on their own "emissions", it's also possible for users to hurt themselves from coming into too much contact with their Quirk. In the case of generating substances, making too much of them too fast or for too long can harm the user as they are using reserves from their own body (such as Momo Yaoyorozu's Creation), or gradually lose their natural resistance to their own harmful Quirk (such as Mina's Acid).

The molecular destruction of Tomura Shigaraki's Decay.

While some things produced by Emitter-type Quirks, such as the loud sound produced by Present Mic's Voice, have common properties, some are unique to the user, and thus have special properties, such as the ectoplasm produced by Ectoplasm's Clones. Those who alter the properties of things around them can also widely vary in effects, from molecular alteration to molecular destruction, such as Softening or Decay, respectively.

Some Emitter-type Quirks cause the user's body to take on a temporary alternation. While such Quirks would normally fall into the Transformation class, the difference is that these powers require the user to take in an outside resource in order for the Quirk to activate. Such Quirks are Sugar Rush, which requires the user to ingest sugar, and IQ, which requires the user to drink tea.

Emitter-type Quirks are, by a wide margin, the most common type of Quirk.

Transformation

Himiko after using her Quirk, Transform, to assume Camie's form,

Transformation (変形, Henkei^?)-type (also called Composite) Quirks are abilities that cause the user to take on a temporary alteration of some kind. Transformation-type Quirks allow the user to temporarily transform their body in a variety of manners, sometimes enhancing existing features, removing features, or adding new features to the body altogether.

Transformation-type Quirks usually require a conscious effort by the user to activate, though most users can be trained to initiate them reflexively, depending on the conditions required for activation, and practice to initiate their Quirks with greater intent and precision. Edgeshot serves as an example with his Foldabody Quirk; he's mastered it to a point where he can change faster than the speed of sound.

Transformation-type Quirks usually require a close-range proximity in order to fully utilize them in combat due to them only affecting the user's body. While Transformation-type Quirks are usually quite powerful, their biggest weakness is that their effects are often temporary, and overexertion usually leads to negative repercussions on the user's behalf. Transformation Quirks can also be limited based on the user, how resilient their body is, and the resources they have available to them. For instance, Tetsutetsu Tetsutetsu describes that his Steel Quirk softens if he doesn't consume enough iron, and suffers from iron fatigue if he maintains it for too long. Some users condition their body in certain ways so that their Quirks can operate more effectively.

A Transformation Quirk affecting another person.

Transformation-type Quirks are the only known type of Quirk that can bestow the user attributes they do not normally exhibit by default. Because this type of Quirk combines the activation time and mutant-shape aspects of the other Quirk types, it is also often known as Hybrid or Composite.

Transformation-type Quirks generally affect the user exclusively, the only known exceptions being Seiji's Meatball and Himiko's Transform.

Transformation seems to be the least common type of Quirk.

Mutant

Mezo's Mutant-type Quirk, gives him extra arms that he can transform into other body parts.

Mutant (異形, Igyō^?)-type (also called Heteromorphic) Quirks are abilities that cause the user a permanent "abnormality" directly related to their power. Mutant-type Quirks create bodily structures that grant the user more complex abilities that Emitter and Transformation Quirks cannot safely provide. Often times they will bestow prehensile appendages that the user can control or add structures to pre-existing limbs to enhance pre-existing abilities. Mutant-type Quirks even have the ability to channel certain aspects of their user through them in a similar manner to Emitter-type Quirks.

Mutant-type Quirks are also the only known type of Quirk which can be passed down through generations without necessarily bestowing the corresponding ability, such as with Fumikage and his bird-like head that is unrelated to his Dark Shadow. As a result of this, while it's uncertain how common Mutant-type Quirks are, it can be safely assumed they are the most commonly inherited.

While not necessarily a weakness, Mutant-type Quirks cannot be turned off, and sometimes cause the user inconvenience due to their malformations. Such is the case with Mashirao Ojiro and his Tail Quirk, which makes it difficult for him to sit or lay down, as well as Mezo Shoji, whose Dupli-Arms Quirk makes it impossible for him to wear clothing with sleeves. Because these Quirks are passively active, they are partially immune to Quirk-disabling effects, such as Eraser Head's Erasure Quirk. Since Mutant Quirks are passively active, they are the most identifiable at a glance.

A heteromorph suffering discrimination.

Users with Mutant-type Quirks, most often known as "heteromorphs", also find themselves the most discriminated against, even by other Quirk users, due to their outer appearances. Mezo always wears a mask over his mouth to hide the scars he received as a child, and people like Chimera and Spinner are pushed toward villainy due to the prejudices they deal with due to their looks. Cults such as the Creature Rejection Clan also exist with the purpose of eradicating these heteromorphs.

Known Quirk Sub-Types

Accumulation

Eri's Accumulation-type Quirk kicks in.

Accumulation-type Quirks are powers that, in order to function properly, require the user to accumulate something ahead of time, such as power, energy, mass, or a particular resource. Such Quirks of this type include One For All, Stress, Rewind, Fa Jin, Fat Absorption and Shame.

List of Quirks

Named Quirks

Quirk	Usage	User(s)	Type
2D-ify		Unnamed Avant-Garders member	Emitter
Absorption and Release		Four-Eyed Nomu	Emitter
Acid		Pinky	Emitter
Acid Sweat		Masaru Bakugo	Emitter
Air Cannon		Unknown former user All For One Tomura Shigaraki	Emitter
Air Walk		Unknown former user All For One (Formerly) Lady Nagant	Emitter
Alchemy		Dark Might	Emitter
All For One		All For One Nine Tomura Shigaraki	Emitter
Amplivolt		Amplivolt	Emitter
Anivoice		Anima	Emitter
Antigen Swap		Unknown former user All For One	Transformation
Anthropomorph		Skeptic	Emitter
Arbor		Kamui Woods	Transformation
Assault Dust		Unnamed Masegaki Primary School student	Emitter
Barrier		Hekiji Tengai	Emitter
Bat		Bat Villain	Mutant
Beams From His Eyes		Ichimoku Samazu	Emitter
Beast		Gevaudan	Transformation
Big Fist		Battle Fist	Transformation
Big Horn		Daikaku Miyagi	Mutant
Big Monkey		Rikiya Eno	Transformation
Binging Ball		Tamashiro	Emitter
Black		Vantablack	Emitter
Black Hole		Thirteen	Emitter
Blackwhip		Lariat Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Blade-Tooth		Moonfish	Transformation
Blast		Sensoji	Emitter
Blazing Hair		Burnin	Mutant
Blood Control		Vlad King	Emitter
Bloodcurdle		Stain (Formerly) All For One	Emitter
Bloodlet		Unknown former user All For One	Transformation
Blueflame		Dabi	Emitter
Body Bulk		Unknown former user All For One (Formerly) Spinner	Transformation
Body Morph		Steel Bulwark	Mutant
Bombify		Number 6	Transformation
Boomerang		Boomerang Man	Emitter
Brainwashing		Nighthide	Emitter
Brawn Boost		Unknown former user All For One	Emitter
Bristle		Tsuyoshi	Transformation
Bruiser		Junkie Villain	Transformation
Bubble		Bubble Girl	Emitter
Bull Head		Minotaurus	Mutant
Cell Activation		Mr. Shimano (Formerly) Katsuma Shimano Nine	Emitter
Cemedine		Plamo	Mutant
Cement		Cementoss	Emitter
Centipede		Centipeder	Mutant
Chameleon		Invisible Wall	Mutant
Charging Muscles		Muscle Man	Emitter
Chest Hair		His Purple Highness	Emitter
Chimera		Chimera	Mutant
Chronostasis		Chronostasis	Mutant
Clean Bubbler		Wash	Emitter
Clones		Ectoplasm	Emitter
Cloud		Loud Cloud	Emitter
Comic		Comicman	Emitter
Compress		Mr. Compress	Emitter
Confession		Shin Nemoto	Emitter
Conjure		Tenko Tejina	Emitter
Control Glass		Starservant	Emitter
Copy		Phantom Thief	Emitter
Cow		Cow Lady	Transformation
Creation		Creati	Emitter
Crystallize		Yu Hojo	Transformation
Cubism		Unnamed Avant-Garders leader	Emitter
Curse		Thousand Eyes	Emitter
Danger Sense		Hikage Shinomori Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Dark Ball		Unknown former user All For One	Emitter
Darkness		Koki Terumoto	Emitter
Dark Shadow		Tsukuyomi	Emitter
Day Dream		Deborah Gollini	Emitter
Delay Spot		Bruno Gollini	Emitter
Decay		Tomura Shigaraki	Emitter
Despot		Dictator	Emitter
Diesel Engine		Willy Wanda	Mutant
Dog		Hound Dog Gigantomachia	Mutant
Double		Twice Mocha	Emitter
Dragon		Ryukyu	Transformation
Dragon Breath		Drunk Lee	Emitter
Dupli-Arms		Tentacole	Mutant
Eagle		Takahiro	Mutant
Earphone Jack		Earphone Jack Mika Jiro	Mutant
Earth Flow		Pixie-Bob	Emitter
Eel		Teruo Unagisawa (Formerly)	Transformation
Elasticity		Gentle	Emitter
Electric Charge		Tesla	Emitter
Electric Eel		Teruo Unagisawa Kuin Hachisuka (Formerly)	Mutant
Electricity Generation		Elecplant	Emitter
Electrification		Chargebolt	Emitter
Electromagnetic Bullets		Unnamed Masegaki Primary School student	Emitter
Endurance		Gigantomachia	Emitter
Energy Saver		Gigantomachia	Emitter
Energy Suck		Rikiya Katsukame	Emitter
Enfeeble		Habuko Mongoose	Emitter
Engine		Ingenium (Tenya Ida) Ingenium (Tensei Ida)	Mutant
Erasure		Eraser Head	Emitter
Erasure Spot		Paulo Gollini	Emitter
Explosion		Great Explosion Murder God Dynamight	Emitter
Extend-o-Hair		Chewyee	Mutant
Extra Arms		Four-Armed Zealot	Mutant
Fa Jin		Bruce Lee Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Fast Fist		Blackbelt	Emitter
Fat Absorption		Fat Gum	Transformation
Fiber Master		Best Jeanist	Emitter
Fierce Gains		Gigantomachia	Transformation
Fierce Wings		Hawks (Formerly) All For One	Mutant
Fire Cracker		Bomb Villain	Emitter
Flight		Captain Celebrity Bombers	Emitter
Float		Nana Shimura Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Fly Swatter		Shoko Haimawari	Emitter
Flying Squirrel		Clair Voyance's sidekick	Mutant
Foldabody		Edgeshot	Transformation
Food		Soramitsu Tabe	Mutant
Forced Quirk Activation		Unknown former user All For One	Emitter
Foresight		Sir Nighteye	Emitter
Free Walker		Eizo Tanuma	Emitter
Frog		Froppy	Mutant
Frost		Rei Todoroki Fuyumi Todoroki Natsuo Todoroki	Emitter
Gale Gale		Gale Villain	Emitter
Gas		Mustard	Emitter
Gatling		Gunhead	Mutant
Gecko		Spinner	Mutant
Gearshift		Toshitsugu Kudo Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Gigantic Spinning Flying Turtle		Eiji Okameda	Transformation
Gigantification		Mt. Lady Gigantomachia Giant Villain	Transformation
Glamour		Illus-o-Camie	Emitter
Glide and Slide		The Three Sturm und Drang Brothers	Emitter
Glycerin		Mitsuki Bakugo	Mutant
Good Ear		Sirius	Mutant
Grasshopper		Ichiro Hotta Jiro Hotta	Transformation
Gyrate		Spiral	Transformation
Hair Control		Needle Hair Martial Hair	Transformation
Hair-Raiser		Mr. Brave	Emitter
Half-Cold Half-Hot		Shoto Todoroki	Emitter
Hardening		Red Riot Stone Villain	Transformation
Hardflame Fan		Unknown former user All For One	Emitter
Heal		Recovery Girl	Emitter
Heavy Payload		Unknown former user All For One Tomura Shigaraki	Emitter
Helical Scythe		Leviathan	Emitter
Hellflame		Endeavor	Emitter
High Spec		Nezu	Mutant
Hologram		Mahoro Shimano	Emitter
Homing		Snipe	Emitter
Horn Cannon		Rocketti	Mutant
Hula Hoop		Unnamed Masegaki Primary School student	Emitter
Hypertrophy		Unknown former user All For One	Transformation
Ice Ply		Geten	Emitter
Ignition		Moyuru Tochi	Emitter
Impact Recoil		Unknown former user All For One	Emitter
Impure Beam		Unknown former user All For One	Emitter
Incite		Trumpet	Emitter
Infrared		Unknown former user All For One	Emitter
Invisibility		Invisible Girl	Mutant
IQ		Saiko Intelli	Emitter
Iron Ball		Sidero	Emitter
Iron Claws		Power Loader Sickle Claw	Mutant
Iron Club		Rogone	Transformation
Jet		Gran Torino	Mutant
Kaiju		Kaiju Villain	Transformation
Kinetic Booster		Unknown former user All For One	Emitter
King Slam		Unnamed Masegaki Primary School student	Emitter
Landmine		Curious	Emitter
Larceny		Toya Setsuno	Emitter
Laser		X-Less	Emitter
Leafipulation		Unknown yakuza thug	Emitter
Leap		Pop☆Step Bee☆Pop (Formerly)	Emitter
Life Force		Kyudai Garaki All For One	Mutant
Lion		Shishido	Mutant
Liquification		Woman	Transformation
Lizard		Rapt Tokage	Mutant
Lizard Tail Splitter		Lizardy	Transformation
Lock Down		Rock Lock	Emitter
Longbow		Beros	Transformation
Longleg		Unknown thief	Transformation
Love		La Brava	Emitter
Mad Gluttony		Ginji Kurau	Mutant
Magic		Majestic	Emitter
Magnetism		Magne	Emitter
Manifest		Suneater	Transformation
Mantis		Kirihito Kamachi	Mutant
Meatball		Shishikross	Transformation
Metal Manipulation		Wolfram	Emitter
Mind Reaper		Odd-Eye	Emitter
Mimicry		Mimic	Emitter
Mole		Unknown former user All For One (Formerly) Gigantomachia	Transformation
Monster Cat		Monster Cat	Transformation
Monster Summon		Simon Gollini	Emitter
Muddied		Giran	Emitter
Multiplier		Unknown former user All For One	Transformation
Mummification		Mummy	Emitter
Muscle Augmentation		Muscular Unknown former user All For One (Formerly) Wolfram Four-Eyed Nomu Hood	Transformation
Muscle Expansion		Hard Head	Transformation
Mushroom		Shemage	Emitter
Mutant Bovini		Stitched Giant	Emitter
Navel Laser		Unknown former user All For One (Formerly) Can't Stop Twinkling	Emitter
Neutralization		Giulio Gandini	Emitter
New Order		Star and Stripe (Formerly) Tomura Shigaraki (Formerly)	Emitter
Octopus		Innsmouth	Mutant
Octopus (Squid)		Octoid	Mutant
One For All		Yoichi Shigaraki (Formerly) Toshitsugu Kudo (Formerly) Bruce Lee (Formerly) Hikage Shinomori (Formerly) Lariat (Formerly) Smoke-Eater (Formerly) Nana Shimura (Formerly) All Might (Formerly) Deku (Formerly) Katsuki Bakugo (Formerly) Tomura Shigaraki (Formerly)	Emitter
Orcinus		Gang Orca	Mutant
Outburst		Ms. Joke	Emitter
Overclock		O'Clock (Formerly) All For One (Formerly) Number 6	Emitter
Overhaul		Overhaul	Emitter
Overmodification		Anna Scervino	Emitter
Pain Blocker		Gigantomachia	Emitter
Papyrus		Salaam	Mutant
Permeation		Lemillion	Transformation
Physical Enhancement		Unnamed Pro Hero	Emitter
Plant		Chomper	Mutant
Plastic Transformation		Mr. Plastic	Transformation
Playtime		Mario Kugutsu	Transformation
Pliabody		Tiger	Transformation
Pointer		Compass Kid	Emitter
Poison Gas		Takeshi Bushijima	Emitter
Poltergeist		Emily	Emitter
Polygraph		Makoto Tsukauchi	Emitter
Pop Off		Grape Juice	Mutant
Power		Hood Pankration	Emitter
Power Stock		Unknown former user (Formerly) All For One (Formerly) Yoichi Shigaraki (Formerly)	Emitter
Propagation		Cluster Bombers	Transformation
Quad Arms		Fourth Kind	Mutant
Queen Beam		Unnamed Masegaki Primary School student	Emitter
Queen Bee		Kuin Hachisuka Bee☆Pop Tamao Oguro (Formerly) Pop☆Step (Formerly)	Emitter
Quirk Bestowal		Yoichi Shigaraki	Emitter
Rabbit		Mirko	Mutant
Radio Waves		Unknown former user All For One Tomura Shigaraki	Emitter
Radio Waves (Bombers)		EMP Bombers Number 6	Emitter
Razor Sharp		Jack Mantis	Transformation
Reflect		Flect Turn	Emitter
Reflect		Unknown former user All For One Tomura Shigaraki (Formerly)	Emitter
Rewind		Eri	Emitter
Rifle		Lady Nagant	Transformation
Rivet		Unknown former user All For One	Transformation
Rivet Stab		Unknown former user All For One Tomura Shigaraki	Emitter
Rocket Thrust		Mazinger Brothers	Mutant
Rupture		Woman	Emitter
Saber		Unnamed Pro Hero	Transformation
Scales		Long Weizi	Transformation
Scalemail		Unknown former user All For One (Formerly) Spinner	Transformation
Scatter		Unknown former user All For One Tomura Shigaraki	Emitter
Scissors		Monika Kaniyashiki	Emitter
Search		Ragdoll (Formerly) All For One Tomura Shigaraki	Emitter
Self-Detonation		Bombers Number 6 Anonymous	Emitter
Serpentress		Uwabami	Mutant
Shame		Teruo Hazukashi	Emitter
Shield		Crust	Transformation
Shock Absorption		U.S.J. Nomu	Mutant
Shoulder-Mounted Jets		Hood	Mutant
Size		Rule	Emitter
Slice		Slice	Transformation
Slide and Glide		The Skycrawler	Emitter
Sloshed		Deidoro Sakaki	Emitter
Smile		Mr. Smiley	Emitter
Smokescreen		Smoke-Eater Deku (Formerly) Tomura Shigaraki (Formerly)	Emitter
Soccer		Emperor Yotsuura	Emitter
Softening		Mudman	Emitter
Solid Air		Kosei Tsuburaba	Emitter
Somnambulist		Midnight	Emitter
Soul		Rody Soul	Emitter
Spatial Excursion		Kamile Gollini	Emitter
Spearlike Bones		All For One and Yoichi's mother (Formerly) Unknown former user All For One	Transformation
Spike		Soga Kugisaki	Transformation
Spirit Possession		Nyikang	Emitter
Spotted Seal		Selkie	Mutant
Spray Art		Unnamed Avant-Garders member	Emitter
Springlike Limbs		Unknown former user All For One Tomura Shigaraki	Transformation
Squirmy Fingers		David Shield	Mutant
Steel		Real Steel	Transformation
Stiffening		Mr. Smith	Emitter
Stock		Garvey	Emitter
Storage		Hood	Emitter
Stress		Re-Destro	Transformation
Strongarm		Kendo Rappa	Emitter
Sugar Rush		Sugarman	Emitter
Suicide Bomb		Suicide Bomber	Mutant
Super Regeneration		Number 6 Multi-Armed Bombers U.S.J. Nomu Eyeless Nomu Hood Woman Ribby Robot Chubs Eleph Near High-End Nomu Tomura Shigaraki	Transformation
Swan		Unnamed pervert	Mutant
Sword Kill		The Serpenters	Emitter
Tail		Tailman	Mutant
Tank Engine		Tommy S. Gordon	Mutant
Tape		Cellophane	Mutant
Telekinesis		Ugo Gollini	Emitter
Telepath		Mandalay	Emitter
Teleportation		Gil Gollini	Emitter
Telescopic		Turtle Neck	Transformation
Tidal Bore		Big Red Dot	Emitter
Toho		Godzillo	Mutant
Tongue Tank		Unnamed Masegaki Primary School student	Transformation
Traject		Kido	Emitter
Transform		Himiko Toga	Transformation
Transforming Arms		Unknown former user All For One (Formerly) Hood	Transformation
Trap Flex		Habit Headgear	Transformation
Tree Frog		Tamao	Mutant
Twin Impact		Mines	Emitter
Vibrate		Grand	Emitter
Vines		Vine	Mutant
Viral Cosmos		Unnamed Masegaki Primary School student	Emitter
Voice		Present Mic	Emitter
Voyance		Clair Voyance	Emitter
Warp Gate		Kurogiri	Emitter
Warping		Unknown former user All For One Johnny	Emitter
Water Control		Dozaemon	Emitter
Water Gun		Kota Izumi	Emitter
Water Pump		Backdraft	Mutant
Wave Motion		Nejire Chan	Emitter
Weather Manipulation		Nine	Emitter
Weld		Welder	Emitter
Whirlwind		Gale Force	Emitter
Whiteline		Ending	Emitter
Whole-Body Lens		Taneo Tokuda	Transformation
Wooden Swords From His Hands		Jube Namimaru	Emitter
Zero Gravity		Uravity	Emitter
Zoom		Mei Hatsume	Mutant

Unnamed Quirks

Quirk	Usage	User(s)	Type
Air Wall		Unknown Former Hero Nine	Emitter
Attraction of Small Objects		Inko Midoriya	Emitter
Bullet Laser		Unknown Former Hero Nine	Emitter
Burst		Near High-End Nomu	Emitter
Control Horn		Cow Cowboy	Mutant
Fire Breath		Hisashi Midoriya	Emitter
Hydra		Unknown Former Hero Nine	Emitter
Luminescence		Luminescent Baby (Formerly) All For One	Emitter
Sandstorm		Snatch	Transformation
Scanning		Unknown Former Hero Nine	Emitter
Sludge Form		Sludge Villain	Mutant
Smoke		Robber Villain	Emitter
Tongue Web		Four-Eyed Nomu	Transformation
Tool Arms		Chainsaw Nomu	Transformation
Vibration Detection		Unknown former user All For One	Emitter
Wing		Near High-End Nomu (Formerly) Tomura Shigaraki	Transformation

Non-Canon Quirks

Quirk	Usage	User(s)	Type
Brown Bear		Bearhead	Mutant
Chart		Kashiko Sekigai	Emitter
Cleaning		Zookeeper	Emitter
Dust		Dusty Ash	Emitter
Eruption		Volcano	Emitter
Fan		Gust Boy	Mutant
Flash Bang Sweat		Dadan Tadan	Emitter
Whale		Curator	Transformation
Zombie Virus		Romero Fujimi	Emitter

Trivia

• The concept of Quirks in My Hero Academia closely resembles the idea of mutants in Marvel Comics and metahumans in DC Comics. Like mutants and metahumans, Quirk users are individuals born with superhuman abilities stemming from genetic mutations. These powers are treated as natural parts of human evolution in their respective universes, and they similarly raise social, ethical, and political questions about power, identity, and discrimination.