It could be his friend, like Mitsuki. Mitsuki has his own secrets and goals, and in some fanfiction, he might be forced to betray Boruto for the sake of some greater good in his mind. For instance, if he has to choose between following Orochimaru's orders and staying loyal to Boruto.
One possible plot could be that Boruto is betrayed by his friends due to a misunderstanding. For example, they might think he has turned to the dark side because of some false evidence planted by an enemy. Another could be that Boruto is betrayed by the village he loves. Maybe the village leaders suspect him of a crime he didn't commit and turn against him.
In fanfiction, the idea of Boruto and Sarada getting married is quite popular. Many fans like to explore this relationship because they have a unique bond in the Naruto universe. Their personalities, with Boruto being adventurous and Sarada being determined, could make for an interesting married couple in fan - created stories.
In most cases, it is legal. Fanfiction is often considered a form of derivative work. As long as it doesn't violate any copyright laws in terms of excessive use of copyrighted material without permission in a way that goes against fair use, it's okay. For example, if a fanfiction writer is just using the Boruto characters in new and creative scenarios, it's generally fine.
No, Boruto is alive in the manga. The plot hasn't led to his death. However, the manga is ongoing, and anything could happen in the later developments.
Physically, Naruto can use his Rasengan or other powerful jutsus to fend off enemies attacking Boruto. His combat skills are top - notch, and he won't hesitate to engage in battle to keep Boruto safe.
It could be a rogue ninja who has a personal vendetta against Boruto's family. This ninja might have caused harm to Boruto's father Naruto in the past, and now Boruto is determined to make him pay.
Well, Naruto would be in a really tough spot. He loves his family and the village, and this situation would be a huge blow to his traditional values. He might struggle to understand how this happened between his son and Hinata. Hinata's family, on the other hand, would be protective of her. Her father would want to ensure that Boruto is taking responsibility. Boruto's friends would also be surprised. Some might be supportive, like Shikadai, who would try to see the good in the situation, while others might distance themselves at first, not sure how to handle this new and rather strange development.
Boruto and Hinata fanfiction can be really interesting. It often explores different aspects of their relationship. Some fanfictions might focus on Hinata's role as Boruto's mother, showing her guiding him through difficult times. Others could create unique scenarios where they have adventures together, which is a great way to expand on the Naruto universe's storylines.