Looking normal in Hero society was an incredibly, incredibly subjective thing.
This was a world in which looking more like a regular Human was more rare than having a mutation of some sort. Quirks affected peoples' biologies in so many different ways that every single person was almost fundamentally different to every other person on a genetic or biological level. Concepts that divided people in the past like race had long been utterly abolished. Everyone looked different to everyone else, there weren't really any categories that made sense to split people into.
Even within that society though, some people stood out more than others. Some people had patterns on their skin, and some had the heads of a bovine, ten fingers on each hand, and a thin tail. It was very subjective as to what was normal and what wasn't.
The very baseline of normalcy had long been eradicated. What was normal was now abnormal. Even the normal baseline of Humanity had mutated - Two hundred years ago, Izuku's green hair, which turned towards black the closer it got to his roots, wouldn't be normal, by any stretch of the imagination. The world had completely changed around them. If someone from the past was transported to the modern day, it would have to be like setting foot onto an alien world, surely.
Still, even within that society, Mina was one of the more standout individuals.
Her pink skin made her contrast against the greys of the cities and pulled attention to her wherever she went. Not that she was the only person who has an unusual skin colour, but the brightness of it helped pull eyes towards her. If that was all it was, that in of itself would be enough, but that was only one of her mutations.
There were her horns that came from her skull, made of bone. They jutted up, then hooked back, and then craned back forward. The taller she got, the more she joked that eventually her horns were going to get caught on the doorframes. It had already happened a few times.
Finally, came her eyes. No idea where those came from, she claimed. Literally none. Her family tree, right back to when Quirklessness was the default, showed nothing that would indicate her black sclera. Even her golden irises were an oddity to her. They just seemed to be natural mutations that occurred irregardless.
Regardless of their origins though...
Izuku adored them.
Mutations were always something that interested Izuku.
Perhaps it was due to his own lack of any definitive features, or perhaps it was how his brain worked - Constantly thinking about Heroism, and how to better utilize just about anything he could in order to become a better Hero.
Mutations were the new normal of mankind. They were present in nearly everyone who had a Quirk, and they ranged incredibly from person to person. One person might have four arms, or someone might have multiple skin colours, or extra digits, or just an iris in an unusual shape. They ranged from outlandish to subtle. Some mutations became so common as to practically become a divergence onto the baseline - Like white pupils that a great many people had.
To Izuku's mind, mutations that had next to nothing to do with a person's Quirk could be utilized. It was always something he considered, growing up around people with them. Someone like, say, Kirishima, if he needed to, could use his sharp teeth to bite someone if the situation ever presented itself and he had no alternative - Admittedly he wasn't sure what sort of situation would come up where that would happen, but the option was open to him.
Those mutations could vary from person to person - Todoroki's were his bi-colured hair and his heterochromia, and Uraraka's were her finger-pads, so it wasn't like this advantage was something that was open to everyone. It was something he was interested in though.
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Izumina Week 2020
Romance2020's Izumina Weeks prompts - From Eyes, to Space and Burns - 8 days of Izumina prompts!