Prologue
Aizawa, at the beginning, never would have believed that he would be a teacher. And, much less, that he would be a teacher from the UA. Why would he? He was already established in Howards.
When he became a wizard, he only was there because he wanted to be away from home. Howards could be the most calmed place that he was in his bare 11 years, without the shouting and the lack of attention. And, Lily was there.
(Oh god, he was a simp when he was a brat)
Then, he became a servant of the You-know-who and blah blah blah. The point is, that when he finally became a teacher, with his betrayal, he knew that he was not a saint. He didn't want to get attached to the students, because they needed discipline, and he didn't knew if he could continue with that discipline if he couldn't be the “mean teacher”.
And then, after some time, Dazai Osamu arrived at Howards, and he changed all his life.
When he first saw him, he saw a problem child that couldn't use magic and didn't pay attention to class. Yes, he was a snake, but that didn´t mean that he was an example of how a student should be. He was a total mess, making friends with the people of Gryffindor and Slytherin at the same time. He made an abomination when he was trying to make potions, and making jokes about suicide when he failed.
But, then, the first impression of the problem child became deeper. When he saw the vendanges in his arms, his thin body, the tired eyes that he had when nobody was around... He knew something was going on.
He knew that feeling to well, and he wanted to do something about it.
Dazai didn't want help, but that didn't mean that he was safe. And, even if he would never admit it, it made him remember his childhood.
The second year, with the vendanges in his eye, with the bullying of “The Demon Student”, and more signs, like the shivers when someone made physical contact, just showed him that he would be at he stupidest person in this planet, if he would just ignore that.
But when he told that to Dumbledore, he just ignored that and justifying it with the classic “There are more important things than that”.
How could he dare to say something like that?!
A child that clearly was suffering, in an environment that just was sinking him in a river of tragedies…
...How would he end up if he continued in that?
What could be his final?
With a bunch of questions, and with the worries pecking on his skin, he searched for answers. This weird thing called google helped him a lot.
At 4 am, searching about the world that he ignored. Because, if he was going to help Dazai, he had to knew what was he doing after school. He found out that in the muggle society, 80% of the people had a type of magic called “quirks”. A genetic development in humanity, making a society of heroes, villians and civilians.
A type of magic that made heroes in the world, like All Might.
He had to take all of his determination to not shout of the impression. Al his life, beliving that the wizards were a hide society, more powerful and superior... When a muggle could destroy a building with his bare hands.
That was his break point.
After Dazai left Howards, (The dissapointment of himself and depression that he couldnt saved his problem child hitted him for months) He moved to Japan, becoming an UA teacher. Why be a teacher? Why be a hero?
He knew the answer.
Howards was a magic school, nothing more. They didn't care when a student clearly showed signs of abuse, or an unsafe home life. They didn't care about the discrimination of muggles' blood and rumors that break friendships, only because that would ruin the reputation of someone. There wasn't a hero that could pay attention to the calls of help. So, even if he hated the hero society, and the discrimination was still there, he wanted to be there for more people. He wanted to be who in Howards he couldn't be.
So, he changed his name. He made a spell on himself, so he could act like he had a quirk. He changed his historial, so he could become a hero in a short period of time.
(Nezu helped him with that)
In less than 2 years, he was a hero, a teacher and a different person because of that problem child.
Now, imagine the shock that he suffered, when he found his problem child in the detention of the UA with another ginger.
(What is the obsession of Dazai having gingers on his side anyway?)
-Oh! Aizawa, we found this 2 in a staff zone. And, they fought Kurogiri and won!- Nezu exclaimed, finding the situation fun.
…Oh god, what the hell happened?