There are a lot of things that could occur. Naruto and Hinata could start a new adventure in heaven. They could meet other deceased friends and have a big reunion. Their relationship could deepen even more as they are free from the dangers and politics of the Ninja world. They might also be given some sort of special task or mission in heaven, which would bring them even closer together while they complete it.
Well, in such a fanfic, Naruto seeing Hinata in heaven could be a really emotional moment. It might start with Naruto being confused about where he is and then suddenly spotting Hinata. Their encounter could lead to a heart - to - heart conversation. Maybe they would talk about their past, their dreams, and how they felt about each other all along. It's a great concept for a fanfic as it gives an opportunity to expand on their relationship in a more spiritual and emotional setting.
Well, perhaps Naruto sees the future where his friends are in great danger. So he tries to change the course of events. He might start to make different decisions in his present to avoid the bad future he has witnessed. For example, he could try to resolve conflicts with certain characters earlier to prevent future wars.
One possible plot twist could be that Hinata is kissing someone as part of a mission. Maybe she has to pretend to be in love with a character to gain information. Naruto, seeing this, initially misunderstands but then later discovers the truth and respects Hinata's dedication to the mission.
In the 'naruto goes to amegakure fanfic', Naruto might encounter new and powerful ninja. He could learn unique jutsu specific to Amegakure. Maybe he'll make new friends or face off against some hidden enemies there.
In the 'naruto goes to kumo fanfic', Naruto could be on a mission in Kumo. He might make new friends or enemies. He could also learn new jutsu from the ninjas in Kumo. It could be a great opportunity for him to grow as a ninja and expand his understanding of the ninja world.
Perhaps Naruto goes to Orochimaru in an attempt to redeem him. Naruto has a strong belief in the good in people, and he might think that he can convince Orochimaru to stop his evil ways. He could offer Orochimaru a chance at redemption, like a new start in the Hidden Leaf Village if he gives up his dark experiments and ambitions. This would lead to a complex relationship development between them, with Orochimaru being skeptical at first but gradually considering Naruto's offer.
In a 'naruto goes berserk fanfic', Naruto might lose control of his chakra in a new and extreme way. Maybe he's pushed to the edge by a powerful enemy that he can't defeat with his normal strength.
In a 'naruto goes crazy fanfic', Naruto might start to use his powers in unpredictable and extreme ways. He could go against his usual moral code and attack his friends or allies by mistake, perhaps due to some powerful dark influence or a misunderstanding of a new jutsu he's acquired.
Well, in the 'naruto goes to ame fanfic', Naruto might encounter new and dangerous enemies in the Hidden Rain Village. He could also meet some interesting characters that are unique to this fan - made story. Maybe he'll discover some hidden secrets about the village or its people.
Maybe Naruto will encounter new types of ninjas in the North. He could learn unique jutsu or skills that are specific to that region.