There are several possible reasons. Firstly, Hinata's unrequited love for Naruto in the original series is a major factor. Fanfiction provides an opportunity to rewrite or expand on that love story. Secondly, her character's growth and transformation are interesting to explore. In fanfiction, she can be given more challenges and opportunities to shine. Thirdly, the popularity of the Naruto franchise means there are countless fan - created stories. Hinata, being a well - liked character, is often the focus. The ability to create alternate universes and scenarios in fanfiction where Hinata can have different adventures, relationships, and personal growth is very alluring for those interested in her character.
One reason could be the desire for more content. The official Naruto story has limits, but fanfic can offer countless new stories. For example, she might want to see different versions of her relationships with other characters.
One possible reason could be her deep love for Naruto. Despite her actions, she realizes that Naruto is the one she truly wants. Cheating goes against her values and her feelings for him, so she regrets it as she understands the harm it has caused to their relationship.
One possible reason could be misrepresentation of her character. In some fanfictions, authors might change her personality to fit a certain plot, like making her overly jealous or mean, which would be out of character for the gentle Hinata. This could make her seem unlikable and thus anger fans who love the original Hinata.
It could be due to external pressures. Maybe the village has certain expectations of them as a couple that they can't meet. Or there could be a threat to the family that Naruto, in his role as a protector, doesn't handle well, making Hinata lose faith in their relationship.
Maybe she wants to keep her real relationship with Naruto pure. Fanfiction can be full of all sorts of wild and untrue interpretations of their relationship. She values what she has with Naruto in reality and doesn't want to be influenced by fictional ideas. For example, some fanfictions might create unnecessary drama or unrealistic scenarios between them.
It could be due to the fact that Naruto is always in the spotlight. Fem Sasuke might be obsessed because she wants to be like him in some ways or wants to understand what makes him so special. Also, their rivalry in the original series might translate into a different kind of intense feeling in this fanfiction, like an obsession.
One possible reason could be if Naruto in the fanfiction is being unfaithful to her. In the original series, their relationship is built on trust and love. So, if the fanfic portrays Naruto in a way that goes against that, Hinata might get mad.
One possible reason could be miscommunication. Maybe Hinata felt that Naruto was always so focused on his ninja duties and didn't have enough time for her. Another reason might be external pressure. For example, if there were some political or family issues in the Hidden Leaf Village that made their relationship difficult to maintain. It could also be that Hinata's own insecurities got the best of her. She might have felt that she wasn't good enough for Naruto, who was a hero in the village.
A misunderstanding is also likely. Maybe Kiba overhears a conversation that he misinterprets. For instance, he might think Hinata is talking badly about him when in fact she is just discussing a general ninja problem. This could make him angry enough to hurt her, either with words or actions.
Well, one reason could be that Hinata's extreme love for Naruto gets out of hand. In the original series, she's very shy but deeply in love. In a fanfiction, this love could transform into an obsessive - like stalking behavior if the writer wants to explore a darker side of her character.