Well, in such a fanfiction, it could be due to various reasons. Maybe Ochako realizes that their hero paths are leading them in different directions. It might also be a plot device to create more drama and character development for both Deku and Ochako.
One great Deku x Uraraka fanfic is 'A Blossoming Bond'. It beautifully captures their relationship development from classmates to something more. The author does a great job of showing how Uraraka's admiration for Deku grows over time and how Deku starts to see her in a different light. Another one is 'Love in the Hero Academia' which focuses on their adventures together and how their feelings for each other are tested during difficult situations.
Well, in a fanfiction about Uraraka's jealousy, it could be that there's a fan event where Deku is paired with another hero - in - training for some sort of activity. Uraraka, seeing them together, feels a pang of jealousy. She tries to hide it, but her actions give her away. For example, she might be a bit short - tempered with others. Her jealousy could also drive her to work on her own skills more, not just to be a better hero, but also to be more appealing to Deku. As the story progresses, she might learn that jealousy isn't a healthy emotion and that she should focus on her own growth and relationship with Deku in a more honest way.
Uraraka might be jealous of someone who has a more powerful quirk than her and is getting more attention from Deku. So she decides to train secretly to improve her quirk. After some time, she shows off her new skills and gains Deku's admiration again.
A really cool storyline could be a time - travel one. Izuku and Ochako go back in time and meet their younger selves. They have to guide their younger selves to become better heroes without changing the future too much. Along the way, they see how their past actions and decisions led them to where they are now. And this experience also makes them realize how important they are to each other in their present lives.
For Bakugou, he could develop more empathy towards Uraraka. Usually, he's very self - centered, but through interactions with her, he might start to consider others' feelings more. For example, if Uraraka is in a tough situation, he could learn to put aside his pride and offer real help.
A good Deku x Uraraka fanfic should first have well - developed characters. Since we already know Deku and Uraraka from the original series, the fanfic should expand on their personalities and how they interact. For example, showing Deku's determination in a new light, maybe related to his feelings for Uraraka. Also, a strong plot is important. It could be about them facing a new villain together or dealing with a problem within the hero school that tests their relationship. Good dialogue is also key, as it can really bring out their chemistry, like when Uraraka teases Deku in a flirty way.
One popular storyline is where Deku and Uraraka go on a special training mission together. They face challenges that test their individual skills and also their relationship as friends. During this mission, they might have to rely on each other more than ever, which deepens their bond.
For Ochako, she might face some backlash from their mutual friends. They might not understand her decision at first. But she could focus on her own hero journey more intently. Maybe she'll start taking on more challenging missions to prove that she made the right choice. And as for their relationship, there could be a chance for reconciliation later in the story if the writer decides to go that route. It all depends on how the characters are developed further.
If Ochako becomes a villain, her relationship with Deku would be severely strained. Deku, being a hero - in - training, would be conflicted between his feelings for her and his duty to stop villains. He might try to reason with her at first, but if she continues on her villainous path, they could end up enemies.