The plot might involve Naruto being on a quest in his rurouni state and Hinata gets caught up in it. For example, he's looking for a rare herb that can cure a strange illness in a nearby village, and Hinata, with her knowledge of plants, offers to help. As they search together, they face some challenges like wild animals or other ninja trying to steal the herb. Through this adventure, their bond grows stronger and Hinata becomes more confident in Naruto's presence.
In a fanfiction where Naruto is a rurouni meeting Hinata, their interaction would have a different dynamic. Canon Naruto was always in a rush, trying to achieve his goals. As a rurouni, he's more laid - back. So when he meets Hinata, he might actually take the time to have a long, deep conversation with her. They could talk about things like their dreams for the future of Konoha, or their personal insecurities. This would be very different from the quick exchanges they had in the original story.
A simple plot could be that Hinata gets injured while on a mission, and Naruto takes it upon himself to nurse her back to health. During this time, they have long conversations and get to know each other on a deeper level, leading to the start of their romantic relationship.
The plot could involve Naruto protecting Hinata from the Hyuga clan's strict traditions. Since he's not bound by those traditions as her brother, he could fight against the elders who want to keep Hinata in a subservient role.
In a 'Naruto and Hinata reborn fanfiction', perhaps they are reborn with enhanced abilities. They might be reborn into a world where ninjutsu works differently. Naruto could be more in touch with his Uzumaki heritage from the start, and Hinata might have a new form of Byakugan. They would have to learn how to use these new powers together, and also navigate their relationship, which may be different from their past life due to different circumstances.
It could also be a misunderstanding. Hinata might be framed as a traitor. Some false evidence could be planted that makes Naruto and his friends believe she has betrayed them. This would lead to a lot of drama and conflict in the fanfiction as Naruto struggles with whether to believe Hinata or the evidence against her.
It could be about Naruto and Hinata going on a secret adventure together. Maybe they discover a hidden place in Konoha that no one else knows about and have to protect it from some sort of threat.
One possibility could be that in the fanfiction, Naruto has realized Hinata's unwavering love and support over the years. So, he starts to obey her out of respect and love. For example, Hinata might suggest a new training method for Naruto, and he obeys without question because he trusts her judgment. It could also involve Hinata having a say in Naruto's decisions regarding the village, as she is also a respected ninja.
One possible plot could be that the Joker discovers a way to travel between universes and ends up in the Naruto world. He decides to target Konoha because it seems like a place full of order that he wants to disrupt. Naruto and Hinata notice the strange new presence in the village. They initially underestimate the Joker, but as he starts causing mayhem, they realize they need to combine their skills to stop him.
In this fanfiction, perhaps Hinata and Naruto are living together and learning more about each other on a deeper level. Hinata could be teaching Naruto some of the traditional Hyuga clan techniques, while Naruto shows Hinata some of his unique jutsu. Their living situation might also involve a lot of visits from their friends like Sakura and Sasuke, creating some really fun and heart - warming group dynamics.
In a 'Naruto meet the Robinsons' fanfiction, Naruto could end up in their world while on a mission gone wrong. The Robinsons, being a curious and inventive family, would be intrigued by Naruto's abilities. Naruto, in turn, would be amazed by their advanced technology. They could team up to face a common threat, perhaps an enemy from Naruto's world who has followed him and wants to use the Robinson's world for evil purposes.