In the fight with Noumu, since Noumu was as strong as All Might, and it was made to battle All Might at 100%, All Might has to punch him with over 100% of his power. And in the last episode of My Hero Academia (Season 3, Episode 4)

Midoriya punchs muscular with One for All 1,000,000%

Does this mean One for All give unlimited power? Or how can they punch with over 100% of their power?

  • I'm guessing its just your "typical" Shounen speak for going above your limits. – Arcane Apr 30 '18 at 5:30
  • I'd say that Midoriya didn't really use 1 million% power, say maybe 200% or smth like that as he used Detroit and Delaware Smash. Basically the 1 million % was most likely his battlecry, not the actual output of power. – Fel31 Apr 30 '18 at 10:17

One for All gives unlimited power?

No, it doesn't. You can't just get 101% power, where is the extra 1% coming from? Out of nowhere? Nothing comes out of nothing! By 100% power, it means the power of all the successors of One for All (as far as I understood). Thus again, it is impossible to get unlimited power.

And if you based your question (clearly you did) after watching Midoriya using One for All at 1,000,000%, I would ask you to think of it again. Can Midoriya even use 100% of One for All in his current condition?

Clearly Midoriya can't even use or control 50% of his power (or let's just agree that he can't use his full power yet without arguing on the percentage)

Now it's time to unravel the mystery. How did Midoriya use 1,000,000% of One for All? Without saying a word, I will just post a picture of the Author explaining how he did that:

The Supplementary Info

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I'd wager that it all comes down to the risks and consequences of going above 100%. If you look at midoriya, when he uses 100% of One for All, it leaves quite a bit of damages. Wich mean that :

The strength of One For All is not limited by one's body

If your body is able to contain One for All, then nice, you can use it at 100% of power all the time, but if you go over the 100% limit, there's no proof that it won't have an effect on your body.

Let's take the All might vs Noumu fight, if you remember well, after defeating Noumu, All-Might was exhausted, and could'nt gather the strength to throw even one punch. While it is true that all might is wounded, and is time limit is closing in, I think it's safe to assume that going above 100% accelerated his exhaustion.

One for All users are able to control the output of their strength

As shown by Midoriya, it is possible to reduces the output of One for All. That's how Midoriya is able to use it without breaking his body in half : He reduces the power output, wich also reduced the harm to his body.

Now if he is able to reduce the power output, and doing so reduces the harm to his body, then I think it's safe to assume that he can also increase the strength of his output, and doing so would increase the harm on his body.

So, Can One for All grant unlimited power ? Technically yes, but using One for All comes with a price, wich is tied to the power output you use. If you go too far, it could probably kill you.

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    It's been pretty clearly stated in the anime and manga that One for All is the culmination of all the predecessors' strengths. Therefore, there is a limit to how much strength a user of One for All can muster, and does NOT grant unlimited power. The POTENTIAL of One for All is unlimited, because each user's strength is added to it when it gets passed on, but the amount of power one can use with One for All is LIMITED to the culmination of strength of the predecessors to that specific point in time. – Jun Kang Jul 17 '18 at 21:07
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    If One for All could grant unlimited power, why couldn't any predecessor defeat All for One? The answer is, until All Might, the collective power of One for All's predecessors was not enough to defeat All for One. Now that Midoriya has inherited One for All from All Might, Midoriya's potential is higher than All Might, because his strength is now added onto One for All's strength. – Jun Kang Jul 17 '18 at 21:10

Deku never uses 100% ever, except in the battle against Muscular. The doctor told Izuku that 80% is everyone's limit, but in an emergency they'll break that limiter and use 100%, but it really hurts the body. Plus, if Deku really had used 1 million percent of One for All's power, it would have killed him and destroyed the whole of Japan.

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