If Naruto and Hinata were sent back in time in a fanfic, it would be a wild ride. Naruto, with his future knowledge, might try to train his younger self in different ways. Hinata could also use her skills and knowledge to protect the village better at an earlier stage. Their presence in the past could disrupt the original power balance. This could lead to new alliances and enmities. They might also be able to save some characters who died in the original story, which would completely change the course of events in the Naruto universe.
In such a fanfic, Naruto and Hinata getting sent back in time could lead to some really interesting relationship developments. They could start their relationship much earlier, and since they already know each other well from the future, they might have a deeper connection right from the start. Also, they could use their knowledge of future events to gain allies more easily.
Well, the story might progress as they try to blend in with their younger selves' lives. Naruto would still be the go - lucky guy, but with a more serious undertone because he knows what's coming. Hinata would be more confident perhaps. They could start to change things like the way ninjas are trained in the village. They might introduce new techniques they learned in the future.
If Naruto and Hinata went back in time in fanfiction, one possibility is that they could change the course of many events. For example, Naruto might be able to prevent some of the tragedies that occurred in his childhood. Hinata could also use her knowledge to help her clan earlier. They might also have the chance to influence the relationships between different characters in a positive way, like improving the relations between the Uchiha and the village.
He might use his future knowledge to avoid some mistakes. For example, he could be more cautious with Orochimaru during the Chunin Exams. He might also try to train harder from the start to become even stronger faster.
One possibility is that he would try to change the relationships around him. He might reach out to Sasuke earlier and prevent him from leaving the village. Also, he could be more strategic in dealing with the Akatsuki, since he'd know their plans in advance.
In a fanfic where Naruto is sent to Haven, he might find himself in a very different environment compared to Konoha. He could encounter new types of magic or powers that are unique to Haven. Naruto's strong will and determination would likely lead him to adapt quickly and try to find a way to use his skills to help the people there. Maybe he would form new alliances and friendships with the inhabitants of Haven.
In such a fanfic, Naruto might become more in tune with his emotions. Hinata is known for her calm and perceptive nature. She could teach Naruto how to better control his chakra in a more gentle and patient way compared to some of his other teachers. This could lead to Naruto developing new and unique jutsu that combine his natural exuberance with Hinata's precision.
In such a fanfiction, Darth Vader could change the course of history. He might prevent the rise of the Empire or alter his own fall to the dark side. For example, he could warn Anakin Skywalker about Palpatine's true intentions, thus changing the entire Star Wars timeline.
Well, in this type of fanfiction, Naruto could change the relationships he had at the academy. He may befriend Sasuke earlier and in a different way, perhaps preventing Sasuke from being so cold towards him initially. Also, he could have more time to train with his classmates and help them improve too, which would make for a very different dynamic in the group.
In a 'the village want naruto back fanfic', there could be a lot of emotional turmoil. The villagers who once shunned Naruto could now be having a change of heart. Some of Naruto's old friends might be the driving force behind the village's decision to bring him back. They could go to great lengths to find Naruto and convince him that the village has changed and that he is needed and wanted there.
In a Naruto and Hinata get married fanfiction, they might have a big, traditional shinobi - style wedding. All their friends from Konoha would be there, like Shikamaru, Sakura, and Kakashi. They would celebrate with lots of food and dancing.