In some fanfictions, new original characters are introduced. These new characters are designed to be a potential threat to Uraraka's relationship with Deku. They might be transfer students with amazing quirks who immediately take an interest in Deku. Uraraka then sees this new character getting close to Deku and becomes jealous, leading to various conflicts and emotional drama in the fanfiction.
A popular plotline is when there's a new girl who has a power that complements Deku's really well. Uraraka sees them interact and gets jealous. She may start to doubt her own worth and place in Deku's life. In response, she could either become withdrawn or go on a journey of self - improvement to be more confident and show Deku that she's the one for him.
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.
As of the latest chapters, Izuku and Uraraka have shown some mutual interest and closeness, but it's not a definite romantic pairing yet. It's still evolving in the story.
In a midoriya x uraraka fanfic, the author might play with the idea of their unspoken feelings. Uraraka's admiration for Midoriya could be delved into deeper, and Midoriya's possible realization of her importance in his life. It could also include some cute moments like when they train together or share a meal, which would add a lot of charm to the story.
Typically, these fanfics often focus on their relationship, whether it's friendship or a budding romance. They usually incorporate elements from the original 'My Hero Academia' universe, like their hero training and the challenges they face at school.