How Does Deku Possess One For All In My Hero Academia?

I still get goosebumps thinking about that hospital scene where All Might literally makes the transfer — it felt like watching a torch being passed. In the world of 'My Hero Academia', 'One For All' is a unique quirk that was created when a quirkless person was given a power that could be passed on and could accumulate strength. The current bearer needs to intentionally pass a piece of themselves (in All Might’s case he used something like a strand of hair/saliva) so the successor ingests it and becomes the new user. That’s how Izuo—sorry, Izuku Midoriya, Deku—ends up with it: All Might chooses him because of his courage and heart, and transfers 'One For All' directly to him.

Mechanically, the quirk stores kinetic power and amplifies the user’s physical abilities. It also kind of carries the echoes of past users; Deku later discovers that previous holders can kind of talk to him inside his head and that their quirks can surface as distinct abilities (like Blackwhip, Float, Danger Sense, etc.). That’s wild, because 'One For All' isn't just raw strength — it’s strength plus a legacy. The downside is brutal: when Deku first uses it, his body can’t handle the output, so he breaks bones and has to learn percentage control and specialized training to use it without destroying himself.

On top of the emotional bit — a quirkless kid being chosen — there’s danger in the world: the villain 'All For One' actually created the quirk originally by forcing one onto someone and manipulating quirks, so the ability to transfer makes Deku a target. Watching Deku learn, train, and slowly unlock those extra powers has been one of my favorite parts of the series; every time he figures out a new control trick I smile like I just won something small and beautiful.

When I explain it to friends who haven’t binged 'My Hero Academia' recently, I usually boil it down: Deku gets 'One For All' because All Might gives it to him. The quirk is special because it’s transferable and stores power, so each transfer makes it stronger. In practice, All Might passed some of himself (you see the DNA transfer scene), Deku swallowed it, and suddenly he had a quirk despite being born quirkless.

There’s more to it, though: 'One For All' carries the history of previous users, and Deku later discovers their quirks popping up inside him as separate abilities. The early arc shows the brutal cost—his arms breaking when he overuses the power—so a big part of the story is learning control, training, and unlocking those inherited quirks. If you want a neat scene to watch again, the handover and Deku’s first attempts at punching are crucial; they show both the technical side of the transfer and the emotional reason All Might chose him.