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Midoriya Izuku tended to think he wasn’t the sort of person who hated others. He had to be tolerant of the neighbors who didn’t like him, patient with the teachers who ignored him during class, forgiving when his classmates “accidentally” used their quirks on his person and belongings.
His mother, too, was fond of saying that it was always better to be the bigger person. To put aside his anger whenever possible, in order to do the right thing. She was no push-over, but Midoriya Inko disliked confrontation and avoided it whenever possible.
Izuku tried to do that as well, but it was hard. He wanted to be a hero, and heroes made a point of intervening when it could help someone, and intervening inevitably meant confrontation. Still: he tried not to hold grudges after the fact.
For the most part, he succeeded.
But there were times when he wanted nothing more than to throw that punch he should have withheld, or make himself possible to ignore in whatever way possible, or to send a package full of spiders in the mail to Kacchan, or to force everyone to see that look, Midoriya exists and he’s more than just a Deku .
To see that look, Midoriya-without-a-quirk is still somebody. Somebody even stronger than you, Kacchan.
He knows he could do it, too. If he really wanted to, if he pulled out his notebooks and all the knowledge he has rattling around his head about all his unforgiving classmates, impatient teachers, and intolerant neighbors. If he wanted to, if he was any inch less of a hero through and through, he would do it.
Sometimes, not always, but sometimes… Izuku is filled up with spite.