It could also be due to a misunderstanding. Perhaps there is some misinformation spread about Sasuke in the fanfiction, like false rumors that he has a hidden and malevolent plan. Naruto, being someone who values their friendship deeply, would be scared at the thought of Sasuke turning into an enemy because of these untrue stories.
Definitely. Fanfic writers often play around with different character dynamics. Sakura being scared of Sasuke can be a part of exploring their relationship in a non - canonical way. It could be due to Sasuke's cold and distant nature, especially after the Uchiha massacre. This fear could be the starting point for many different plotlines in fanfics, such as Sakura trying to understand Sasuke better to get over her fear or Sasuke realizing the impact of his actions on Sakura.
Their relationship could start off very tentatively. Sasuke, being so used to solitude, might be a bit standoffish. But Hinata's gentle nature could gradually break down his walls. They might start with simple exchanges, like Sasuke noticing Hinata's Byakugan abilities during a battle or training session. This could lead to a mutual respect, and as time goes on, they could become friends and perhaps more depending on how the story progresses.
In a fanfic, Sasuke's association with dangerous elements might make Sakura scared. For instance, if he teams up with a group of rogue ninjas. Also, his emotional state could play a role. If he is consumed by revenge and his anger is constantly boiling over, Sakura, who cares about him, might be scared of his self - destructive tendencies. Additionally, if Sasuke were to develop some sort of mind - control ability that he struggles to control, Sakura would surely be frightened.
Maybe Sasuke is being manipulated by an evil force that wants to get at Naruto through Hinata. Since Hinata is important to Naruto, targeting her would be a way to hurt Naruto.
It makes their relationship more tense. Normally, they have a complex but strong bond. But with Naruto being scared, there is an added layer of unease. Naruto might avoid Sasuke, which is a big change from their usual interactions where they would confront each other directly.
One possible fanfiction scenario could be that Hinata, Sasuke and Naruto are on a difficult mission together. They start off with some tension due to Sasuke's past actions. However, as the mission progresses, they learn to trust each other more. Hinata might use her gentle nature to ease the situation between Naruto and Sasuke. Naruto's determination and Sasuke's skills combine with Hinata's support to make them a formidable team in this fictional adventure.
In a highschool fanfiction, Sasuke and Hinata's interaction could be really interesting. For example, in a classroom debate, Sasuke's strong opinions might clash with Hinata's more gentle and empathetic views. But this contrast could lead to a deeper understanding between them as they learn from each other's perspectives.
In some fanfics, Hinata might be the one to bring Naruto and Sasuke closer together. Since she has a deep understanding of Naruto's heart and also respects Sasuke's strength, she could act as a mediator between the two. For instance, when Naruto and Sasuke have an argument over a strategic decision during a battle, Hinata steps in to calm them down and find a compromise.
A really interesting one is 'The Unlikely Trio'. This fanfiction imagines a mission where Naruto, Hinata, and Sasuke are forced to work together in a very dangerous and isolated place. They have to rely on each other's strengths and overcome their differences to survive, which makes for a really engaging read.