Common themes in 'bakugou kidnapped' fanfiction often revolve around Bakugou's growth during the ordeal. He might learn more about himself or his relationships. There could also be a theme of mystery, where the identity of the kidnapper is slowly revealed through clues. And sometimes, the fanfiction will focus on how the situation affects the overall story - line or the world in which Bakugou exists, for example, how it impacts the hero - villain dynamic in the story.
I'm not sure of specific 'bakugou kidnapped' fanfictions off - hand. But you can try searching on fanfiction websites like Archive of Our Own (AO3). Just type in 'bakugou kidnapped' in the search bar, and you should get a list of relevant fanfictions.
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.
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.
Bakugou might react with his usual anger. He could lash out at the bullies verbally or even physically, which might make the situation worse. For example, if someone makes a snide comment, he could respond with a loud and aggressive retort.
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.
All Might would probably be one of the first to try to stop Bakugou. As Izuku's mentor and a symbol of justice in the story, he wouldn't tolerate such violence. Another could be their teacher, Aizawa. He's strict and protective of his students, so he'd surely step in.
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.
Midoriya is very likely to be in it. He and Bakugou have a complex relationship. Midoriya could be the one who either challenges Bakugou to face his fears or is there to support him in the process. Their rivalry - turned - friendship can play a big role in Bakugou's journey of facing his fears.
Bakugou might be initially shocked. He's used to Izuku calling him 'kacchan' for so long that it's become a normal part of their relationship. So, when Izuku stops, it could throw him off balance.