Kakashi would probably be a bit concerned. He cares about Naruto like a student and a son. He might talk to Naruto privately and tell him to give it a chance. At the same time, he could also have a word with Hinata's family if he feels the forcing is too much. As for Sakura, she might be a bit jealous at first, but then she would realize that Hinata is a good person and try to encourage Naruto to be more open - minded towards the marriage.
Sasuke would probably be very against it. He has a strong sense of justice and would see this as completely wrong. He might directly confront those who are forcing Naruto into this situation.
Naruko's friends would have a range of reactions. Her female friends might gather around her, giving her emotional support and advice. They would tell her to be strong and not let this forced marriage break her. The male friends, like Kiba, might be more ready to take action. They could try to intimidate those who are forcing the marriage. As for Sasuke's friends, they could be divided. Some might think this is a good opportunity for Sasuke to move on from his past and settle down. Others might worry that it will make Sasuke more withdrawn, as he might not be ready for such a commitment. They would all be watching the situation closely, ready to step in if things go wrong for either Naruko or Sasuke.
There would be a lot of shock and disappointment among fans. Naruto and Hinata are a beloved couple, and fans who have followed their story would find it hard to accept such a plot. Many would probably criticize the author for going against the essence of the characters.
Well, one way it could develop is that Naruto initially resists the marriage. He might be angry at being forced into it and try to find a way out. But as time goes on, he starts to see Hinata's good qualities, like her kindness and loyalty. Maybe he begins to understand that there could be something good about this arranged situation.
Hinata would be heartbroken. She loves Naruto deeply. Her world would shatter. She might try to find out the truth behind his death, not believing that his friends could do such a thing without a good reason. And she would probably hold a grudge against those involved.
It could be a character from another important ninja clan, like Hinata perhaps. Since Hinata has always had feelings for Naruto and her clan is also a significant part of the village, Minato might see it as a good match.
Another way is to join fanfiction communities or forums dedicated to Naruto. Ask the members for recommendations. They can point you to some great stories that don't involve any forced relationships. Some members might even have their own collections of fanfictions that they can share with you, which are often carefully curated and free of inappropriate content.
One common reaction could be Naruto's shock. In most fanfictions, Naruto is portrayed as someone who deeply loves Hinata, so being cheated on would leave him completely stunned.
One reason could be envy. Maybe Naruto sees Hinata as having something he doesn't, like a more stable family situation, and he lashes out in jealousy. Another reason might be that he's just being a typical, rambunctious kid who doesn't realize the impact of his words or actions on Hinata.
He might also become more reserved in future relationships. After being cheated on by Anko, Naruto could be more cautious when it comes to getting close to someone again, always having that fear in the back of his mind that he could be betrayed once more.