He might become more responsible. Since One for All is such a significant power, he'd have to step up. He couldn't just be as reckless as he used to be.
Bakugou could become more empathetic. Understanding the weight of One for All, which was passed down with a lot of history, might make him see things from a different perspective. He may start to value teamwork more, as he realizes he can't handle this power alone all the time. He might even become a bit more humble, though that would be a big change for him. After all, having a power like One for All would force him to re - evaluate his place in the hero world.
His self - confidence could skyrocket in a different way. He already has a lot of confidence, but with One for All, he'd feel like he's on a whole new level. However, this could also lead to some overconfidence issues. He might start to take on challenges that are way beyond his current capabilities with the new quirk, thinking he can handle anything just because he has One for All. This could put him in dangerous situations and also cause some friction with his friends and allies.
Midoriya is often a common character. Since he has a complex relationship with Bakugou, his reaction to Bakugou's expulsion can be an important part of the story. All Might might also be included as he could be a mentor figure who tries to guide Bakugou, even after his expulsion. And Bakugou's other classmates like Kirishima would likely be there too, as they are his friends and would be affected by his leaving.
He could become more empathetic. If the quirk makes him experience something difficult like the pain of others or a disability, it might make him more understanding of those around him who are less powerful or have faced hardships.
His relationship with Deku might change significantly. Usually, Deku is seen as someone Bakugou has a complex relationship with. When Bakugou gets hurt, Deku could become more protective or Bakugou might finally start to see Deku in a new light, as someone who truly cares about him.
His aggression might become more unhinged. Without the moral compass of the hero side, he could be more willing to use excessive force. He'd still be competitive, but now it would be against heroes instead of his fellow hero trainees.
One possible plot could be that Bakugou is in the middle of a battle with villains. He's being his usual brash self, charging ahead. Suddenly, a sniper from the villains' side takes aim and shoots him. His friends then have to rush to his aid and figure out how to get him medical help while still fending off the villains.
Well, Bakugou's development in Bakugou One For All fanfics can be quite complex. Initially, he might struggle with the idea of having a power that wasn't his own. But as the story progresses, he starts to adapt. He becomes more empathetic as he realizes the sacrifices that were made for One For All to be passed down. His relationships with his mentors, like All Might, also change. He becomes more receptive to advice and starts to see the bigger picture of being a hero, not just in terms of strength but also in terms of character and leadership.
A '5 times bakugou fanfiction' could be really interesting. It might explore five different emotional states of Bakugou. One time could be when he was extremely angry and how that affected his actions. Another time could be when he was vulnerable, perhaps after a difficult battle. Then there could be a time when he was happy and celebrating a victory. And two more times could be related to his growth as a character, like the first time he realized he needed to change his attitude towards his friends, and the second time when he actually made a significant change in his behavior.
One idea could be '5 Times Bakugou Saved the Day'. It would show his heroic side as he uses his powerful quirk to rescue people in different dangerous situations. Another idea is '5 Moments Bakugou Realized His Mistakes', which would focus on his character growth.
He might lose his own quirk temporarily. In some fanfictions, a quirk hit can disrupt a character's own power system.
There's also a possibility that it's an agent of a secret organization. This organization might be aiming to disrupt the hero society, and they see Bakugou as a key figure to target. So they send one of their best shooters to take him down.