Quirkless

Quirkless (無個性) is a term that describes someone who was born without any Quirks whatsoever in the My Hero Academia universe.

Description
Quirkless people exist as a minority in the My Hero Academia universe, possessing absolutely no Quirk, particularly unique features, or anything that would put them under the classification of being superhuman. They appear to be the subject of mockery and a level of prejudice, as shown by Izuku Midoriya's treatment in the first few chapters of the story. Commonly, anyone who does not possess a Quirk is considered to be weak and worthless, or that their circumstances are incredibly unfortunate and rare.

As seen in the beginning of the series, people who are born with Quirks do not have an additional joint in their small toe, suggesting a close chromosomal linkage between the extra toe joint and a lack of a Quirk; people with the additional toe joint are almost always Quirkless.

Quirkless people make up approximately 20% of the world, and the trait of Quirklessness appears to be recessive; meaning if at least one parent has a Quirk, that child is more likely to be born with a Quirk, even if the other parent is Quirkless. However, if both parents are carriers for Quirks, there is a chance that their child will be born without a Quirk, as seen with Izuku, who inherited neither of his parents' Quirks.

It is possible for a Quirkless person to gain a Quirk later in life, such as One For All. However, they must train their bodies in order to be able to use the Quirk, similar to how Izuku worked hard to earn his Quirk. This is because, unlike other people who are born with adaptations, they are born with none.

Currently, only three people in the entire franchise are confirmed to have been born totally Quirkless: Izuku Midoriya, Toshinori Yagi, and Melissa Shield. However, it is possible to steal a Quirk, as seen with All For One, who rendered Tomoko Shiretoko Quirkless, despite having been born with a Quirk. Quirks can be destroyed in a particular way; currently, only the Yakuza villain group, the Shie Hassaikai, managed to achieve this by using Quirk Destroying Bullets. Using these bullets, they rendered a third-year student at U.A. High School, Mirio Togata, Quirkless. The Vigilante Knuckleduster has also been rendered Quirkless by unknown means.

Additionally, if an individual requires a certain body part to activate their Quirk, it is possible to render them functionally "Quirkless" by destroying said body part. Kai Chisaki, whose Quirk is triggered by the fingertips, is one such example; after having both of his arms destroyed by Tomura Shigaraki and Atsuhiro Sako, he is now unable to activate his own Quirk despite still technically possessing it.

Born Quirkless

 * Izuku Midoriya
 * Toshinori Yagi
 * Melissa Shield
 * Maruta Shiga

Lost Quirk

 * Mirio Togata
 * Tomoko Shiretoko
 * Iwao Oguro

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