Something just hit me with the force of a brick wall while re-reading the backstory of One for All (mainly the story of All for One and his brother):
One for All is passed down with the DNA of the user, right? The successor has to digest the DNA in any form – a hair, blood (?) – just something to take One for All into his body. Tracing that back to the beginning, that means that the very first user of One for All, the little brother, gave his DNA to his successor. And that successor passed it down again, and again… until we reach Izuku, who got it from All Might.
What I’m trying to say here is – if there are traces of all the DNAs of all of the former users of One for All somehow stored in that quirk, then that means that there are also remnants of the little brother’s DNA in there.
Who happens to share his DNA – at least partly – with All for One.
On the other hand, there would also be a part of Nana’s DNA in One for All – who shares her DNA with Shigaraki.
Both villains, mentor and student, are connected to One for All by their DNA.
I wonder if this is going to be important in the future.
(I’m sorry, I’m rambling stupidly again.)
