The way other characters interact with her will change. They might view her as a male, so there could be different power dynamics, friendships, or rivalries. For example, male characters may treat her as a brother or a competitor.
It might also lead to a re - evaluation of gender roles within the fanfiction world. If Sakura is successful in her pretense, it could make other characters and the overall story question the traditional expectations and limitations placed on genders.
It can make the tone darker. Since Naruto is a main character and Sakura is also important, when he hurts her, it can bring a sense of unease and sadness to the story.
It can create a lot of tension. If Naruto hates Sakura, it changes the dynamic of their team. Their interactions become more strained and filled with conflict, which can drive the plot forward as they have to work together despite their feelings.
On the other hand, her jealousy could also be a driving force for her to improve herself. She might see Naruto's success and instead of just being jealous, use it as motivation to become stronger. This could lead to a more equal relationship in the long run, as she catches up to him in terms of skills and abilities.
It might also create a rift within their group. If their friends witness Naruto yelling at Sakura, it could cause tension among the whole group. Some might side with Naruto, thinking Sakura deserved it, while others might defend Sakura, leading to a divided group dynamic in the fanfiction.
It might create a rift between them. If Naruto feels that Sakura is always nagging and yelling, he could start to avoid her. In some fanfictions, this could lead to a period of estrangement where they don't work well together as a team. For example, Naruto might choose to go on solo missions instead.
It can create tension. Sasuke's jealousy may lead him to push Sakura away at first. He might be afraid to show his true feelings, so he acts distant. But this only makes Sakura more confused and a bit hurt. Eventually, if they communicate, it can strengthen their bond as they realize the depth of their feelings for each other.
When it comes to Kakashi's possessive - like protection, Sakura might see it as a sign of his faith in her abilities. It could inspire her to train harder and become a better ninja. But at the same time, if it's too much, it could also put pressure on her. For instance, if Kakashi is always pushing away potential training partners for her because he's possessive of her development, Sakura might miss out on some valuable learning experiences.
It could strain their friendship. Naruto might start avoiding Sakura, which would make her realize she's done something wrong and try to fix it.
The reincarnation can introduce new cultural elements. If the SI was from a different world or time, they might bring with them different ways of thinking, building, or even cooking. This can start to change the setting as the local characters in the Sakura world become exposed to these new ideas. For example, they could introduce new farming techniques that increase food production in the area.
It can make the story less focused on sexual elements. Since Sakura avoids Sasuke in these types of fanfiction, it might shift the focus away from inappropriate relationships. For instance, the story could then explore other aspects of the Naruto universe like the friendships between other characters.