Well, some might be really amazed. They could see a new side of Deku that they never knew before. His singing might show a different level of confidence or a hidden talent, so they would probably cheer him on.
Bakugo would likely be furious. He'd feel betrayed and would probably be the first to attack Deku, yelling at him about how he's thrown away everything they've worked for. Uraraka might be more empathetic. She'd try to understand what drove Deku to become a villain and hope there's a way to bring him back to the side of good.
Well, 'Aizawa to the Rescue' is a great 'aizawa helps deku fanfic'. It shows Aizawa stepping in when Deku is having a tough time at school, either with bullies or difficult academic tasks related to hero studies. And 'Aizawa's Encouragement' is a heartwarming one. Aizawa gives Deku the confidence boost he needs, especially when Deku doubts himself during battles or when facing new challenges in his hero journey.
Deku's experiences with being bullied for not having a quirk. This would be important because it shaped Deku's character and his insecurities. Aizawa might focus on this to better understand the root of Deku's drive and his sometimes over - eager nature to prove himself. It also gives Aizawa more insight into why Deku is so desperate to be a hero despite the odds.
You can try fanfic platforms like Archive of Our Own (AO3). It has a large collection of fanfics, and you can easily search for 'aizawa helps deku' in the search bar. There are also some fanfic communities on Reddit where people might share or recommend such fanfics.
Deku might be completely shocked at first. Since Bakugou has always been so aggressive towards him, he would never expect such a confession. He might just stand there, mouth agape, not knowing what to say.
He might cry a lot. Deku is very emotional, and being cheated on would be a very painful experience for him. He could also get angry, which is rare for him, but this situation would be so unjust that he might not be able to hold it in. He'd probably start to question his self - worth too, thinking that there was something wrong with him that made his partner cheat.
Deku might be initially shocked. He's used to Bakugou's aggression, but an actual injury is different. He could be in pain and disbelief at first. Then, he might try to downplay it, especially if he doesn't want to cause trouble for Bakugou, because Deku is generally a very forgiving character.
He could be surprised. Maybe there are aspects of Deku's past in the fanfic that Aizawa wasn't fully aware of. This new knowledge might make him view Deku in a slightly different light, perhaps with more understanding of his motives and fears. It could also make him more determined to support Deku in the future, both in the fanfic's storyline and in his own mental image of Deku.
Well, a major theme is trust. In many fanfictions, Deku has to earn Aizawa's trust, and once he does, it becomes a crucial part of their relationship. Another is the exploration of their different personalities. Aizawa is more stoic and reserved, while Deku is enthusiastic and idealistic. Their interactions based on these personality differences are often explored. And of course, the theme of heroism. They both are heroes in their own ways, and how they contribute to the hero world together is a common theme.