This one is for my anime and Webtoon fans I suppose, and this is really a no-brainer.
Both of these stories occur with the base idea of a world full of super powers, and the main setting and situation in both is a school. They both have their differences as well, however, such their main characters. Both are "quirkless" or "crippled", same thing really, and both receive or secretly have tremendous power. One is shy, nerdy fanboy with a big heart, and the other is a confident guy that refuses to get pushed around, and might have some mental health problems...
Another thing is that in the anime, The world has its fair share of villains and licensed heroes, while the Webtoon has world where power is everything and the stronger you are, the more political power you have against those around you. Bullying also doesn't seem to be a problem...in the sense that no one cares about it enough to put their figurative foot down...
Anyways, I digress. The point is, this would be a great fanfic or comic, and despite it being such and obvious crossover, in my opinion at least, I have found relation between the two, no fan art of the two together or anything. In fact, the only things I have found are crazy discussions about whether Unordinary is a rip off of My Hero Academia, which is absolutely absurd.
Like I mentioned before, they're both initially the same concept, except that concept splits into vastly different scenarios.
Maybe fans of both of them are too aggressive towards each other that they don't see the fun possibility, or maybe the Unordinary fans are simply a bit... dishevelled right now because the tension is hugh right now in the story, because Dangnambit the Tension is still rising!
anyways, I mean no insult fans of either, of course, as I'm a fan of both.
To End this off, I don't have much for plot ideas besides the cliche Interdimensional mishap, but maybe someone else can find some way to meld the worlds together, mix the history and world factors together.
Anyways, that's all for this concept for now.