Truth about One For All

Austin_Bale said:
We know thanks to both One For All and All For One that quirk factors contain a part of someone’s consciousness. When OFA’s past users passed on the quirk, they passed on a part of themselves along with it. That’s what the vestiges are. All Might’s vestige is different because he doesn’t have a quirk factor, so instead his consciousness was imbued into OFA directly rather than through his own quirk. As for why Deku will probably be the last wielder, it’s because with all the quirks that have been added to OFA, it’s now too much for someone who already has a quirk to handle. If someone with a quirk inherits OFA, it will massively shorten their lifespan. So if Deku has a successor, it would have to be a quirkless person, but quirkless people are super rare these days. It’s true that 20% of the population is still quirkless, but those are mostly old people. The prevalence of quirks increases greatly with each generation, to the point where they’re nearly extinct in Deku’s generation, and finding one who’s worthy of inheriting OFA 30 or 40 years in the future will be basically impossible.

akaivikram said:
I also asked the same question a few days before but I think no one saw it. so this was really a great help