Chapter 17: MHA Theory
What if the so called Quirk was a virus.
My theory is that the quirk was created when a human experiment gone wrong, the experiment was initiated to create a perfect serum that is immune to all known and unknown disease in the world, when they manage to create the serum by testing it on animals they need to find a human to test it, there in a hospital they proposed that the serum they create will saved a sick child from dying, the mother of said child agreed to their proposal for she wants to saved her only child, so the baby undergo the procedures after the serum was injected the child became healthy every hour. In midnight the nurse try to check on the child only to find out the the child is glowing. The scientist tried checking the child but the child was healthy the only difference is that the DNA of the child is mutated to an unknown that make the child glow.
Years later most human started gaining powers after taking the serum that created the glowing child. The people who did not liked the idea of the new generation gaining powers from a bottle started to rebel and attack the organization of this experiment, destroying the building and killing the scientists involved in the experiment, in their last rope the scientists did something that the rebellion never thought off, the scientists fired a rocket containing all of the serum they manage to save. The rocket shot to the sky while releasing a mist form serum spreading them to the world.
Decades later almost the whole population in the world have a super power being, For those human who was not born without power was seen as an abnormality because they don't have a super power, but what everyone doesn't know is that all the living being who doesn't have a superpower was born with immunity to the virus that created by the serum that was created ages ago.
The Quirkless, who people now call those who doesn't have powers adapted to became immune to the virus. As Humans adapted throughout the years it became immune to the virus and because of this they were born without the sign of gaining powers/quirk, while the humans adapted to the virus the virus also adapt and evolved as well after years of being pass through many human genetic, the first ever virus to evolved had the power to give and take the other viruses of the other beings, while the second virus evolved to be passed on like a parasite while helping its host to became strong inorder to maximize its survival until it finds a new host.
Weekly Power Status
-- Power
Ranking 
-- Power
stone