The villain Overhaul's desire to rid the world of quirks in My Hero Academia is based on a dark theory that quirks are not a gift that bestows their possessors with superpowers, but rather the result of a disease that has spread throughout humanity. While it might be common for fans to believe that All For One is the most serious threat to the safety and security of the My Hero Academia universe, there are other villains such as Overhaul aka Kai Chisaki, who have proven to be every bit as malevolent and deadly as All Might’s old nemesis.

Unlike All For One, there’s a reasonable argument that Kai’s diabolical plans are actually in the public’s interest. Specifically, he wants to rid Japanese society of quirks and return humanity to the way it was before the spread of quirks when life, and crime, was much more manageable for criminals like him. Moreover, since Kai himself has a quirk, it would seem he is willing to sacrifice his own special powers for the greater good. Kai believes his plan will work in a manner that does not kill those who have quirks, but rather eliminate the ability of the quirk to function in the way they originally performed by giving superpowers to their possessor.

Related: How Do Quirks Work In My Hero Academia

Kai’s understanding of quirks is based on a theory that their presence in humans is not some extraordinary event, but rather due to a “previously undiscovered virus” that was spread all over the world by mice, then passed on to humans and spread in a pandemic-like situation that led to the infection of the majority of people on Earth. While there is no evidence to support Kai’s beliefs about quirks, a significant proportion of the population believes it to be true. Conversely, there is also no evidence that overwhelmingly counters or debunks the Kai's theory. As a result of quirks, Kai argues, society has become dysfunctional. One the one hand, quirks now allow people who never would have thought of committing a crime a reason to rob, steal, murder, or otherwise actualize their inner deviancy. On the other hand, quirks have facilitated the spread of "hero syndrome" among the community of do-gooders and the belief in ordinary people that they can save the world. The resulting society is a hotbed of crime, vigilantism, inequality and disorder.

MHA Overhaul

Kai wants to return order to society, which has led him to spearhead the development of a “quirk destroying drug” that when injected into the bloodstream through the use of special bullets, “rewinds” the body's genetic code to the state before the quirk mutilations occurred. The effect of the shot being that quirks are rendered useless. If Kai’s method to eliminate quirks sounds familiar, that would be due to the fact that it is not much different from real-life methods of stopping the virus outbreaks. That is, he wants to inoculate those with quirks such that their quirks are made impotent, and that any quirk genes that might be passed on to subsequent generations remain similarly impotent.

It also sounds similar to All For One’s plan to return life to how it used to be by removing the quirks from those who do not want them or are irresponsible in using them, and giving them to those who are willing and able to take the power quirks provided and use them positively. The main difference between the plans is that Overhaul truly wants to eliminate quirks, albeit in a way he could profit from and All For One wants people with quirks to remain in the My Hero Academia universe, as long as they are loyal to him.

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