In a world where most humans on the planet develop superpowers soon after they're born, Izuku Midoriya was one of the few who never developed any powers. As a child, Izuku wished to become a superhero like his idol, All Might, once he developed his power, or "Quirk". As such, he was devastated once he learned that he'd never get any powers. His lack of a Quirk made him a prime target for bullying, but Izuku decided he still wanted to be a hero, and wished to go to the prestigious U.A. hero academy. Ten months before the entrance exams for U.A. started, and Izuku came face to face with All Might after being saved from a villain by him. Izuku asked All Might if it was possible for someone without powers to be a hero. However, the same villain from before ended up breaking free and attacking one of Izuku's classmates. Despite not having powers, Izuku still tried to attack the villain. While he didn't stop the villain, he did give All Might enough time to defeat them himself. After this, All Might decided that Izuku could become a hero, with his help. He decided that he would grant Izuku his own Quirk to help him achieve his dreams. After ten months of training, All Might passed his Quirk, One For All, down to Izuku. Izuku then managed to pass the entrance exam, and officially enrolled in U.A.
One For All: Izuku's Quirk, which was passed down to him by All Might. This Quirk allows Izuku to enhance his strength, speed, and durability. However, Izuku only has enough control to use One For All's full power in a single limb, greatly boosting the strength of said limb. With one One For All-boosted punch, Izuku was able to take out a giant robot with one punch. Unfortunately, using One For All like this will usually break whatever body part it's used in, and overused of it has led to Izuku's hand being permanently disfigured.
Detroit Smash: An uppercut enhanced by One For All. The air pressure from this attack was strong enough to shatter multiple windows and break through several floors of the building above him.
Delaware Smash: By enhancing his fingers with One For All and flicking, Izuku can fire powerful blasts of air pressure. However, he can only do this up to ten times before his fingers break.
Costume Gamma: After deciding to make his fighting style more kick-based to lower the damage to his arms, Izuku had some modifications made to his Hero Costume. The new additions consist of arm braces to shield his arms, and iron boot soles to increase the power of his kicks.
One For All Full Cowl: In order to prevent breaking his bones when he uses One For All, Izuku created this technique. By using only 5% of One For All's power and transferring it through his entire body, Izuku can empower his whole body and prevent himself from breaking bones while attacking. However, due to only utilizing a fraction of One For All's power, the boost he gets isn't as high as when he uses One For All normally.
5% Detroit Smash: A downward punch enhanced by One For All Full Cowl.
One For All Full Cowl: Shoot Style: A variation of Full Cowl that only affects Izuku's torso and legs. By concentrating the flow of power into only two areas, Izuku's legs gain a much larger boost than when he uses Full Cowl on his whole body. Izuku developed this technique to compensate for the damage his arms were taking when he fought, letting him utilize a kick-based fighting style that allowed for more range and power.
One For All 100%: A rare state that allows Izuku to access One For All's full power throughout his entire body. In this state, one punch can shatter most of a large cliff, and his speed and durability also increase. However, using this form will greatly damage Izuku's body.
100% Detroit Smash: A punch enhanced by One For All 100%, which can send someone flying into a cliff hard enough to partially shatter it.
1,000,000% Delaware Detroit Smash: A technique that has Izuku boost One For All's power far past 100% before he smacks the opponent aside. This attack was enough to overpower Muscular's Quirk and incapacitate him with one blow.