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In one Boku no Hero Academia Wikia
[Wikia](http://bokunoheroacademia.wikia.com/wiki/Shota_Aizawa) they mention
Shota Aizawa can't erase Mutation-Class Quirks. Which are these Quirks?


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my-hero-academia
What are Mutation Class Quirks?


Mutation type quirks tend to be irregular body quirks.  
Think of [Toru Hagakure's transparency
quirk](http://bokunoheroacademia.wikia.com/wiki/Transparency) .

> Mutant (異形 Igyō?)-type Quirks can have a wide variety of features and
> abilities depending on the individual, but the common similarity seems to be
> that these Quirks are a part of the user's physicality, causing the user to
> exhibit irregular bodily features that generally have some sort of purpose
> to them. As a result, Mutant Quirks are passively active and, at a glance,
> are the most identifiable.
> [source](http://bokunoheroacademia.wikia.com/wiki/Quirk#Mutant)


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