One possible plotline could be that Naruto's sister secretly helps him during his difficult times in the village. Maybe she provides him with extra training resources or helps him outwit the bullies without him knowing it's her at first.
The main antagonists could be the traditional Naruto villains like Orochimaru or the Akatsuki members. They might target Naruto's sister as a way to get to Naruto, seeing her as a weakness or a way to manipulate him.
It could be an original character created just for the fanfiction. Many fanfiction writers like to introduce new characters to add their own unique twists to the story.
Well, Naruto's reaction can vary. Sometimes, he might be a bit hesitant at first. Given his past focus on becoming Hokage and his general obliviousness to Hinata's feelings in the original story, he could take a moment to fully process what she's saying. He might then respond with a heartfelt speech about how he values her and wants to explore their relationship further. For example, he could say something like 'Hinata, you've always been there for me, and I want to be there for you too. Let's see where this love takes us.'
In most ethical and moral frameworks, incestuous relationships, even in the context of fanfic, are considered inappropriate. However, in the realm of fanfiction, it's a fictional exploration. But real - world moral values generally condemn such relationships.
Perhaps Naruto would immediately reciprocate Sakura's feelings. Given his kind heart and his deep bond with Sakura over the years, he might realize that he has also had underlying romantic feelings for her all along. This could lead to a very sweet and passionate relationship. They would support each other even more in their ninja goals and become an even more formidable team. Their friends would likely be very surprised but also happy for them in the end.
She could be an original character created specifically for this fanfiction. The author might give her unique abilities and a distinct personality to make the story more interesting.
She could be a really strong - willed character. Since she's from the world of Naruto, she might have a fierce determination to protect her village and those she loves. Maybe she's also curious about Harry's world of magic and wants to learn more, showing her inquisitive side.
Well, different fanfic writers approach it in various ways. Some might write it in a more psychological way, delving deep into the sister's psyche to explain why she has such feelings. Others might use it as a shock factor to draw in readers, but then try to resolve the situation in a way that still adheres to some sense of morality, like having the sister realize it's wrong and move on. There are also those who might write it in a very dark and disturbing way, but that's not the norm. Usually, they try to handle it with some level of responsibility, even if it's a fictional and often taboo concept.
Their friends outside of the immediate ninja team would also have different responses. Some of the villagers who have watched Naruto grow up might be overjoyed. They see Naruto as a hero, and seeing him find love would be like a fairytale come true for them. However, there might be a few who are more cynical and think that it's just a passing phase or that it could cause problems in the village in some way. But in general, the positive reactions would outweigh the negative ones.