Quirkless

Quirkless (無個性) is a term in the My Hero Academia universe that is used to refer to someone who was born without any superpowers whatsoever.

Description
Quirkless people are those who possess absolutely no Quirk, particularly unique features, or anything that would put them under the classification of being superhuman. As of now, they exist as a minority in the My Hero Academia universe, currently making up approximately 20% of the global population.

Before the rising phenomenon of Quirks (previously known as Meta Abilities), Quirkless people were considered ordinary, and far outnumbered those with Quirks (previously known as Metas). However, after generations passed by and superpowers came to be accepted, people possessing Quirks now make up the majority of the human population.

Society reacts differently to Quirkless people. In the case of Izuku Midoriya, for example, he was the subject of mockery and prejudice, whereas with Melissa Shield, although she had a good relationship with people with Quirks, she used to be seen with pity for being Quirkless. Commonly, anyone who does not possess a Quirk is considered to be weak and worthless, or that their circumstances are incredibly unfortunate and rare.

Despite being seen as weak, one advantage Quirkless people have is that they are immune to bioweapons that stimulate Quirks to dangerous degrees, such as the Ideo Trigger Bombs, given that they lack a Quirk in the first place.

Generally, it is seen as impossible, though not actually prohibited, for Quirkless people to become Heroes due to their need to combat Villains and enter dangerous situations. Furthermore, Pro Heroes who have lost their Quirks are forced to resign from their posts after being deemed unfit for duty, such as O'Clock and Ragdoll. Despite this, being Quirkless doesn't appear to affect other career areas, at least not as heavily, as Kyudai Garaki became a well-reputed doctor and physician, despite being listed as Quirkless in his official records.

There are currently no known cases of Quirkless Villains, since the legal definition of a Villain is a person who uses their Quirk to break the law. Pro Heroes do not have the jurisdiction to deal with non-Quirk criminals, and need to refer them onto the police, although there are exceptions for extreme cases where Heroes can arrest non-Quirk criminals, albeit with restraint.

As stated by Dr. Tsubasa, people born Quirkless are quite uncommon in the current era, and Yoichi Shigaraki has noted that the number of Quirkless individuals has continued to become far fewer as the generations pass by.

Genetics
The trait of Quirklessness appears to be recessive; meaning if at least one of the parents has a Quirk, then the child has a higher chance of being born with a Quirk, even if the other parent is Quirkless. However, even if both parents are carriers for Quirks, there is still a chance that their child will be born without a Quirk, as seen with Izuku, who didn't inherit either of his parents' Quirks or develop an amalgam of their powers.

As seen at the beginning of the series, people who are born with Quirks only have one joint in their pinky toe, suggesting a close chromosomal linkage between the extra toe joint and a lack of a Quirk; people with two joints in their pinky toe are almost always Quirkless.

Quirk Attainability
It is possible, though highly uncommon, for a Quirkless person to gain a Quirk later in life. One such example of this is them being given a transferable Quirk, such as One For All. However, since they were not born with said Quirk, their body would not be naturally suited to it; because of this, they must train their body in order to be able to use the Quirk properly, similar to how Izuku worked hard to build up enough muscle to use a Quirk that stockpiles large amounts of raw power. Another way for a Quirkless person to gain a Quirk is for a Quirk to be bestowed upon them through a Quirk that can give Quirks to other people, such as All For One. Unfortunately, some recipients are put into a mindless state due to their inability to handle the physical strain of being given a power through this specific Quirk, or sometimes, as was the case with Yuga Aoyama, their body can't handle the Quirk and is forced to rely on a support item to utilize it properly.

Another, more commonly used method of Quirk attainability is via Quirk-infused DNA injection, which involves an individual being infused with the DNA of a Quirk user, granting the recipient the same power as the donor. One instance is when Kuin Hachisuka, while already possessing a Queen Bee Quirk, injected herself with a blood sample collected from Teruo Unagisawa, allowing her to access Teruo's Electric Eel Quirk. However, the recipients don't always acquire the same Quirk efficacy as the original user of the Quirk they've obtained. An example of this is the Villain Nine, who was injected with the DNA of another Villain named All For One, granting the former the same ability to steal Quirks from other people, but he was limited to only being able to wield a maximum of 8 stolen Quirks.

Becoming Quirkless
It is possible for a person to lose their Quirk. One way this is possible is if an individual requires a certain body part to activate their Quirk, which is where their Quirk Factor is located. It is possible to render them functionally "Quirkless" by severing or destroying said anatomy. Kai Chisaki, whose Quirk required the use of his hands, is one such example; after both of his arms were destroyed by Tomura Shigaraki and Mr. Compress, Kai was left unable to activate his own Quirk, despite still technically possessing it. Another example is Shota Aizawa, whose Quirk requires his eyes; after losing one of his eyes to Tomura, his Erasure Quirk has been rendered nearly useless, despite still being able to activate it.

Another way a person can lose their Quirk is by being subjected to drugs that can damage their Quirk Factor. The Yakuza group, Shie Hassaikai, developed a Quirk-Destroying Drug using the genetic material of a girl named Eri, whose Quirk allows her to reverse people back to the way they once were. The drug itself rewinds a person's Quirk Factor back to before the Quirk Phenomenon became a factor of human genetics.

Additionally, a person will become Quirkless if their Quirk is stolen by someone whose Quirk has the power to do so. One such example is the power-stealing Quirk, All For One.

In the unique case of One For All, when the Quirk is passed down, the previous recipient will be left with only the "leftover embers" that will eventually burn out, as seen when All Might used up his remaining power in his battle with All For One, rendering him Quirkless and forcing him to retire.

Born Quirkless

 * Toshinori Yagi
 * Melissa Shield
 * Yuga Aoyama
 * Izuku Midoriya

Lost Quirk

 * Iwao Oguro
 * Tomoko Shiretoko
 * Mirio Togata (Temporarily)
 * Mahoro and Katsuma Shimano's father
 * Cathleen Bate
 * Keigo Takami

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