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For those who don't know a brief description of the 2 major quirks involved in
the main story of _My Hero Academia_ are the quirks One for All (All Might,
Izuku) and All for One.

First, about One for All,

> All Might explains that One For All is the union of two Quirks: A Quirk that
> stockpiles power and a Quirk that could be transferred to others. One For
> All allows the user to access stockpiled power, which grants the user
> momentary superhuman strength at destructive levels, increased agility, and
> superhuman speed. Izuku Midoriya is the ninth user of One for All.

Now, about All for One,

> All For One allows the user to steal other people's Quirks and wield these
> stolen powers as their own. All For One also allows the user to transfer
> stolen Quirks to other people. The user of All For One can combine several
> Quirks in order to create devastating techniques which would normally not be
> possible with the usage of only one Quirk.

In the fight between All Might and All for one,

> we see the combined effects of multiple quirks used together by All for one.
> Going by the name that is around 10-12 stolen offensive quirks (not to
> mention numerous defensive ones as well as ones allowing him to live etc.
> [![](https://i.stack.imgur.com/3Emff.png)](https://i.stack.imgur.com/3Emff.png)

How is it that the combined physical prowess of 9 individuals (2 of which we
know were quirkless) can be stronger than the combination of at least a dozen
Strong quirks, maybe more?

Possibly Related: [What does it mean that "One for All" allows to stockpile
power?](https://anime.stackexchange.com/questions/46643/what-does-it-mean-
that-one-for-all-allows-to-stockpile-power) The accepted answer fails to
explain how this stockpiling would outgrow All for One unless it's some sort
of exponential increase for One for All vs a linear increase for All for One.


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my-hero-academia
How is "One for All" stronger than "All for One"?


Because All for One is adding powers on top of one another, while One for All
is multiplicating its strength.

All for One is using the quirks of other users, I think he isn't the kind of
person to go and master each and every one of those quirks.

On the other hand, every user of One for All has been training the same quirk
again and again, mastering it, and then passing their knowledge to their
successors.

I don't think the battle All for One vs One for All was a pure contest of
strength, but also of mastery and technique. You can clearly see that when it
comes to pure strength, All for One is stronger. But when it comes to ability,
All Might was better.

What made All Might victorious was not his strength, but his ability to think
ahead, and his near-perfect mastery of One for All.


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There's no reason to assume that the strength of AFO's techniques is a simple
function of the number of quirks that he incorporates.

Think of it like a recipe. Does a dish always get better and better as you add
more and more ingredients? The answer is no. It only gets better if you add
the right combinations of ingredients, and even then, there comes a point
where adding more ingredients serves no purpose. Sometimes adding unneeded
ingredients even makes the dish worse.

Meanwhile, OFA does just keep getting stronger. It doesn't necessarily have to
worry about coherently engineering a bunch of different synergies. Not that it
doesn't have other limitations, but apparently they're not severe enough to
prevent it from being able to overpower AFO.

* * *

Another point is that there are physical limits to how. An example was how
Todoroki's body temperature dropped during his fight with Deku in the
tournament. It is possible that AFO has similar limits.

It need not be a contrived limit either such as some sort of "maximum" number
of quirks he can marshal at once. It could be the case that he just doesn't
have the mental capacity to keep track of **all** of the quirks he can
possibly use at once.


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I don't think it's clear that All Might didn't have a quirk prior to receiving
All For One. He said he didn't have a quirk ... but everything else indicates
he did. For instance, when he can't use his quirk, his body shrinks and loses
all the mass he has as All Might. This implies that ability is a quirk. I
believe All Might actually had a quirk that, just like the original user of
All For One was not evident until it was combined with the other quirk.

What isn't clear also is why Deku has not shown a significant mass increase as
well, especially when he is using 100% of the power of his quirk. Admittedly
in the anime, he is only using about 8% as of season 3's ending. So this may
change as he is able to use more of All For One.


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If memory serves, it was stated (or at least heavily implied) that the
increase of One for All is exponential. Whereas All for One is only increasing
linearly very fast, but it was most likely overtaken or at least matched in
power by the fight against All Might.

It is also likely that All for One is experiencing Logarithmic growth causing
his power increase to slow down as he reaches his mental/physical limit for
the usage of quirks.


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One for All may be stronger because of the exponential increases, but certain
quirk combinations of All for One are just too good to be ignored.

For example, the intelligence quirk of the principle would allow him the
intelligence required to use all sorts of quirks to their fullest potential.
For example, the intelligence quirk combined with foresight and the create
quirk would allow All for One the ability to counter any opponent he fights.

One for All may have more strength, but All for One has almost infinite
flexibility with any quirk combinations at his fingertips. He has the power to
counter any opponent.

Another quirk combination that could completely shut down any opponent without
interacting with them in any way would be Eraser Head's quirk to stop any
shenanigans, brainwashing, and confession.


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