User blog comment:GAMEONBOI/quirk duplication quirk/@comment-35975040-20180724113951

I can understand where your coming from, but honestly, I don't think regenerative quirks or super strength quirks are as rare as you make them out to be. I think quirks like these are pretty prevalent, but have slight differences in properties. For example, Aizawa labels Deku's quirk as "Superpower" (possibly to hide OFA) meaning that it's being presented as a strength quirk, but the condition is that whenever he outputs too much energy it backfires. Yo Shindo of Ketsubutsu makes note of this. Similarly, during Mt. Lady's debut in the first episode, we can see that both her and the criminal she was apprehending had gigantification quirks, Endeavor's and Shoto's quirks involve flames but so does Midoriya's dad supposedly, and even All for One says he has several strength multipliers in Camino.

Again, I understand where you're coming from, since we don't see many similar quirks in the main series, but I think quirks like strength augmentations aren't that rare.

However, since you brought up Tomura, I think AFO did give him his quirk(s?). Not only would it suit the killer Shigaraki he wanted to create if his quirk was inherently destructive in nature, but I also believe that this was not Nana Shimura's quirk. If it was, All Might or Gran Torino would've realized it sooner. I think AFO also plans to give Tomura more quirks in the future. He tells Best Jeanist that his quirk isn't worth stealing because it requires more practical skill attained over time, AND IT WOULDN'T ALIGN WITH TOMURA'S PERSONALITY. That implies at least that AFO's planning to give Shigaraki a quirk.

That's all, have a good day.