Where Every Scroll is a New Adventure
Thinking about rare quirk mutations.
Like... there are so many characters (especially villains omg) where if they had just. developed a normal quirk/their family quirk/were quirkless they wouldn't have been plot relevant at all really.
You have Shigaraki, and Toga, and Eri (plus some that I feel are maybe implied but I'm not 100% on) and the only reason why they are here and important is because they developed a powerful quirk at a sucky time and doomed themselves at least a little.
Shigaraki obviously (and I may be missing some lore here but wtv) who just so happens to develop a devastating quirk immediately after a terrible fight with his family so it's the perrrrfect time to just disintegrate all of them
Eri who develops her quirk and of course the first thing she rewinds is her dad and then she gets sent away/experimented on.
I almost want to say "quirk singularity" but these aren't powers that increased in strength over generations and generations. These are just random mutations that are powerful AF and fate these kids to crappy lives because how are you supposed to live normally with power that immense??
Something something, "If you put the power of a God into the hands of a child, something's going to go awry."