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I'm only following the anime and I dont know if the manga or some guide says
something about this, I dont think there is any hint in the anime about it.
IIRC, it was said that Gran Torino started to train All Might in combat right
away because he could handle the power of One for All at once. Midoriya in the
other hand, everytime he uses One for All 100% breaks his body and to keep
from harming himself he has to use One for All 5% or 20% later for what I've
read in a wikia. Is it known why All Might could handle the power of One for
All at once and Midoriya couldnt?


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2018-06-24T15:40:44.120
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2019-10-07T22:47:33.920
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my-hero-academia
Why All Might could handle the power of One for All at once and Midoriya couldnt?


Sadly there is no explanation that will satisfy you or the question. However I
can give a small spoiler about it.

> In later chapters it's revealed that All Might once used support items to
> increase his power output like %10.

That's all we know.


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2018-06-24T21:15:07.097
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It hasn't been clearly stated in the manga but One for All is a stockpiling
quirk that gains power from the current user and this power is transferred to
the next when the quirk is transferred. With each transfer the power of the
quirk increases which mean that when Nana gave All Might the quirk it wasn't
as strong as when All Might gave it to Midoriya.


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