'It has been said that something as small as the flutter of a butterfly's wing can cause a typhoon halfway around the world'-Chaos Theory
To many people, Katsuki Bakugou would come off as a loud, brash child with a great quirk. A perfect candidate to be enrolled at any hero school. What not many people realized was that under that brash exterior laid an intelligent mind that was to be feared.
Even very young, Katsuki understood the way that society was structured and that despite what his parents and teachers would claim, no one was created equal.
He first understood this when he met his childhood friend's elder twin brother.
When Katsuki first met Madara he thought the boy to be a mere nerd stuck within books all day and weak. The glare he had been pinned under while the boy delivered his unspoken threat was anything but weak.
When Madara first got his quirk, it wasn't really that impressive and yet the boy still managed to beat everyone that came against him with his genius mind and cunning schemes. Katsuki respected him for that. Madara was not weak, not by a long shot. When it came time for elementary school Katsuki asked Izuku where his brother is, Izuku said that he tested out of elementary school and was on his way to test out of middle school as well. It was then that Katsuki understood on what level Madara truly was. Still he was determined to beat him. After all he can't be the number one hero if he can't beat the smart guy with the useless quirk. Katsuki would quickly learn that he was not the only special one. Madara was too.
When the news came that Izuku was quirkless, Katsuki was at a loss again. Izuku was Madara's brother, his twin. Whenever Izuku wasn't with Katsuki, he was with Madara. How could the brother of such a special person be useless?
Katsuki tried distancing himself from Izuku. He called him Deku now, meaning useless. He shunned him and yet the other boy kept on clinging to him. One day Katsuki was out and about putting down the extras that thought they could challenge him when Deku stepped in to protect one. Katsuki was mad. How dare the Deku try and play the hero? He was weak, quirkless and had to be protected, that was his place in society.
Sure, he was better than all the other extras because of his smarts and he would make an invaluable asset later on as a support techie for Katsuki, but he would still be a civilian. This was Katsuki's origin story, not Deku's.
That day he sent the nerd home with a black eye and burns on his hands. It was a mistake he would never repeat.
True, Izuku was powerless, but Madara was not and for better or worse Madara was like Katsuki in many ways. He won at any cost and ensured that his enemy couldn't rise again to threaten what he held most dear. The beating Madara gave Katsuki that day was one Katsuki remembers even now as the only time in his life that he honestly thought he would die, before the sludge villain that is. At the end of it he came out with a broken arm and wrist, a sprained ankle and a body that was more of aalking bruise.
Katsuki told his mother that he got caught up in a gang fight but managed to escape. For the next month he could feel Madara's eyes on his back the entire time. Deku was keeping him company though and Madara was always along as his brother's personal bodyguard. It came to the point that no one was willing to even talk to Deku for fear of what his brother might do to them if they said the wrong thing.
This kept going on until Deku finally put his foot down just like he did with Katsuki. At first Katsuki thought that Madara would beat the little nerd black and blue for talking like that to him when he was doing his job as a hero and protecting Deku, but he only nodded and left. He was never seen again intimidating people to not bully Deku. Once again Katsuki was confused. Why did Madara listen? He was smarter, stronger and had a quirk.
He was better than Deku in every way, so why did Madara listen to what was supposed to be an extra in his life. Deku was meant to be a background character in the stories of Katsuki and Madara so why did Madara listen to Deku? Katsuki didn't know the answer but he decided that if Madara the genius listened to Deku then there might be some value in what Deku said and Katsuki should listen too.
Katsuki did and immediately saw an increase in his performance in the use of his quirk. Deku was not that useless, but still useless. Eh whatever, Deku was Deku no matter how you took it.
It would be years later that Katsuki would see another shift in his worldview. A student managed to absolutely shatter All Might's record score at the UA entrance exam. The student's name: Madara
Midorya.
The week after that was an absolute frenzy as all the extras crowded Deku to get some pointers on how his brother got this strong. Still, Katsuki's respect for Madara only increased. To have enough power to beat All Might's record and at a younger age than when All Might took the exam himself meant that you had incredible power and potential. Another shock came a few weeks later when 19 students from UA's famous class A were expelled leaving only one: Madara Midorya.
There were those that said the teacher was biased, but those extras had no place in UA in the first place. Must have been a bad year if this was the cream of the crop. There was a class B, but their quirks were not that well suited for direct combat, not like Madara's. Katsuki had seen the leaked footage of Madara using the ground on those robots and crushing them like some trash compacter.
Then there was Deku. He seemed happier suddenly and his eyes had this fire in them that he had only seen in Madara before him or the time before Deku was deemed quirkless. He was also dead tired and had scrapes and bruises from what was obviously combat training. The nerd had probably asked his brother to train him or fail that ask some teachers at UA about where he could seek training.
One thing was clear to Katsuki. This year's sport festival would be interesting.
To Izuku, Madara was more than his brother, he was his anchor. His big brother was the first person to tell him that he could be a hero and he was the only one that never doubted him. Madara always made time to play or spend time with Izuku. Izuku knew that is he ever had a problem he could not deal with then his brother would be by his side and willing to devote all his strength to help him in whatever way he could. Be it letting Izuku cry himself to sleep in his bed, Madara himself staying the night with him when he had a nightmare, helping him with school work, dispatching the hoard of bullies that thought to take him on, teaching him how to defend himself and giving him advice on how to best train in order to take up the mantle as All Might's successor.
When Izuku was 9 Madara told him about his quirk that was probably not a quirk. He told him of how his eyes could see chakra in him and how he could see something called the 'eight gates' in Izuku.
Madara said that the eight gates were like valves that controlled a person's chakra and stopped them from exploding from the inside, but they could be opened if you knew how and it will grant you a boost in power enough to beat even All Might. Izuku wanted to doubt that anything could beat All Might, but Madara had never lied to him and was rarely wrong about anything. Even so, the cost of opening all of them was death, so Izuku was understanding when Madara told him flat out that he wouldn't teach him the eight gates if he had a choice.
Izuku tried to meditate and unlock his chakra but nothing happened. It was more than a little frustrating for bought brothers since Madara kept powering forwards, discovering new and innovating ways to use chakra while Izuku was stuck. In the end the two of them decided to use a more forceful method to unlock Izuku's chakra once summer brake rolled around since Madara had refused to let Izuku have chakra without supervision.
Then, on the day of the UA entrance exam, while his brother secretly went to take it, Izuku met All Might who at the offered his own quirk, One For All, to Izuku as well as the mantle of Successor to the Symbol Of Peace after witnessing his actions and dedication to save Kachan.
It made Izuku so very happy. He would finally get a quirk of his own and his brother would stop worrying so much about him, not that it wasn't nice that he cared so much.
Madara had always cared. Even their mom was willing to look away and not investigate Izuku's injuries any more than accepting the standard ' tripped' excuse or taking his slightly ruffled state as children roughhousing when he had been beaten up. But Madara wasn't like that. He always asked where he got even the slightest bruise and luku knew he couldn't lie to his brother to save his life, but he was grateful for Madara's overprotective tendencies, even if he got a bit carried out in doling justice to the bullies. At least he could reign in his temper, unlike Kachan.
Speaking of his sort of friend, Izuku knew that the time Kachan came to kindergarten all busted up was because he had a run in with his brother.
Izuku hadn't cared enough to notice at the time and when Madara went too far again he asked him to stop. And he stopped, so Izuku knew he could trust his brother with anything.
It was why he broke his promise to All Might and told Madara about him and One For All. In the end even All Might admitted that Madara's guidance during that first month of training as well as the previous training Madara had all but forced on Izuku would pay off well. Who knows, maybe Izuku would be ready to receive One For All before the entrance exam since Madara didn't seem too fond of letting him into the exam with only some martial arts skills and an untested power.
The popularity he got at school because of his brother's success was a bonus, somewhat. It brought him back on speaking terms with Kachan at the very least. Sure, it involves some shouting, but Izuku was used to the caustic personality that came with the package deal that was Katsuki Bakugou. Their relationship would never be fully mended, not yet at least, but they weren't clashing with one another each time they saw each other.
Madara had told Izuku that Katsuki's violent actions and bullying of others was his way of dealing with a world that wouldn't align with his mental image of how it should look like. A world where the weak stayed weak, and the strong rise to the top and on that top was Kachan. Obviously not since the top spot would inevitably fall into Madara's lap before his brother got bored of it and let others take it for themselves, but honestly Izuku was ok with that. Madara never lorded his superiority in anything over anyone, save perhaps some old cots at the university who couldn't accept that they were wrong, and always did his best to raise those around him up alongside him.
In Izuku's eyes, Madara was the one that should take the position of All Might's successor but when he broached that subject with his brother all he got was a pat on the head, a smile and the simple words 'I believe in you'.
Izuku knew that this meant his brother had entrusted him with the legacy of All Might fully as well as a shard of his very own will and legacy.
Izuku would do his best to not fail his mentor and brother, the two most important people in his life.
A/N sorry for not posting yesterday to make it up y'all get two chapters to day