One plot idea could be a time - travel fanfic. Naruto, Sakura and Hinata are sent back in time to their childhood days. They remember their future lives where they got married. This knowledge makes them act differently. Naruto tries to avoid some of the mistakes he made in the past. Sakura focuses more on her medical ninjutsu from a young age. Hinata works on her confidence even earlier. Eventually, they still end up getting married in a more perfect way than in the original future they knew.
In a fanfic, there could be a magical spell gone wrong. A powerful ninja casts a spell that was supposed to strengthen the bonds between the three of them (Naruto, Sakura and Hinata) for the good of the village. But the spell backfires and they end up thinking they are married right away. Naruto is confused but tries to be a good 'husband' to both. Sakura is initially angry about the situation but then realizes that there are some good aspects to it. Hinata is blushing all the time but also enjoys the new closeness. As they try to figure out how to reverse the spell, they actually start to develop real feelings for each other and by the end, decide to stay married even after the spell is broken.
One interesting plot idea could be a story that focuses on their wedding preparations. It could show how Naruto, who is not used to all the formalities, struggles with choosing the right wedding kimono or learning the proper wedding etiquette. Hinata, on the other hand, is more in tune with the traditional aspects but is nervous about becoming the wife of the Hokage. Another idea could be a time - travel fanfic where they go back in time to their first meetings and relive those moments with the knowledge of their future together. It would be a chance for them to see how far they've come and how their relationship has developed over the years.
One idea could be a story that focuses on their wedding preparations. It could show how Naruto is clueless about most of the traditional wedding stuff in the Hyuga clan, and Hinata has to patiently explain it to him. Another plot could be set after their marriage, where they face challenges in balancing their ninja duties and family life. For example, a mission comes up that might take Naruto away for a long time right after their honeymoon, and they have to figure out how to deal with it as a newlywed couple.
One idea could be that they are brought together through some kind of post - war alliance building. With the ninja world in a state of rebuilding, their villages see the marriage as a way to strengthen ties. Hinata, with her gentle nature, slowly breaks through Sasuke's cold exterior as they navigate the challenges of married life together, like dealing with family expectations from both the Hyuga and Uchiha clans.
One idea could be that Sakura, still being Naruto's friend, helps Hinata with some wedding preparations. She could use her medical skills to make sure Hinata is in perfect health for the big day. Another could be a story where Sakura initially has some mixed feelings about Naruto marrying Hinata but then realizes how happy they are together and becomes their biggest supporter. For example, she might see how Hinata understands Naruto's dreams and ambitions in a way she never could, and that makes her respect their relationship more.
A plot could involve time travel. Naruto and Hinata find themselves sent back in time, and they have to find a way to get back to their own time. Along the way, they meet a younger Sasuke and Sakura. This gives Naruto a chance to try and prevent some of the bad things that happened in Sasuke's past, and Hinata can bond with a younger Sakura, sharing her own experiences of growing up shy and how she overcame it.
One idea could be a story where Naruto and Temari are arranged to be married for political reasons between Konoha and Suna. At first, they're both a bit hesitant, but as they start to spend time together, they discover they have more in common than they thought. For example, they both have a strong sense of duty to their villages. Another plot could involve a threat to both villages that forces them to marry quickly to show unity, and during their relationship's development, they learn to trust each other and combine their unique ninja skills to protect their homes.
One idea could be a mission where Naruto, Sakura, and Hinata have to infiltrate an enemy stronghold. Naruto uses his shadow clones for distraction, Sakura provides medical backup and uses her strength in combat, and Hinata uses her Byakugan to detect hidden traps. Another could be a story set in a post - war Konoha where they work together to rebuild and also deal with the emotional traumas of the war. They could also go on a journey to find a lost ninja art that was once from Konoha but was stolen long ago.
A plot could revolve around their family planning. Maybe Sakura wants to start a family right away, but Sasuke is hesitant due to his past and the dangerous world they live in. This creates tension between them, and they have to work through their differences and communicate better. They could also face external pressure from the village elders regarding their family plans.
A plot idea could be that they go on a mission together as a married trio. They encounter a powerful enemy that can only be defeated by the combined efforts of their unique skills. Naruto uses his Rasengan, Sakura her super - strength punch, and Ino her mind - control abilities. This mission could strengthen their bond and show how well they work together as a married team.
Perhaps a plot where they all enter a ninja tournament together. They start as rivals within their own village but as the tournament progresses, they realize that they need to work together to defeat a common enemy from another village. This would involve them training together, sharing their techniques and learning to trust each other more.