One idea could be Naruto and Hinata going on a secret mission together as Hokage and his wife. They face an unknown enemy that tests their relationship and combat skills. Another could be a story set in an alternate universe where Naruto isn't the Hokage and he and Hinata have a simple, peaceful life in the village, but then a threat emerges that forces Naruto to step up in a different way.
A great plot idea could be about Naruto and Hinata's family life. Hinata is pregnant and Naruto has to balance his Hokage duties with taking care of her. Meanwhile, there are rumors in the village that some old enemies are regrouping. So Naruto has to find a way to protect his family and the village at the same time. It could show their love and commitment to each other and the village in a more domestic setting.
One idea could be Naruto as Hokage facing a new threat that only Hinata's unique skills can help with. For example, a mysterious enemy that can nullify normal ninjutsu, but Hinata's Byakugan - based techniques are effective. Another plot could be a time - travel fanfic where Naruto and Hinata go back in time and have to prevent a disaster that would change the future of the Hidden Leaf Village. They could also explore their relationship in a different era.
Another plot could revolve around the family going on a diplomatic mission to another village. Along the way, they encounter various challenges that test their family bonds and ninja skills. For example, they might have to deal with bandits or a natural disaster. They could also learn about the different cultures of the other village and how to make alliances in a more personal way.
Another plot could involve Naruto and Hinata dealing with a new threat to the village that specifically targets their family. They must protect their children and the village while also maintaining their relationship. This could include Hinata using her Byakugan in new and creative ways to help Naruto in his leadership role.
One idea could be Naruto facing a new and powerful enemy that challenges the very foundation of the Hidden Leaf while he's Hokage. He has to use his unique leadership style and ninja skills to protect the village. Another could be Naruto implementing new training programs for the younger ninjas, based on his own experiences growing up.
One idea could be a story where Naruto has to face a new, powerful and mysterious enemy that has the ability to manipulate time. This would put his skills as a Hokage to the ultimate test.
One idea could be Naruto facing a new and mysterious threat from a hidden clan that has long been dormant. They could be trying to undermine the peace he has worked so hard to achieve as the Seventh Hokage.
One idea could be exploring the Shodai Hokage's early days as a ninja, before the founding of the village. Maybe show his training and how he developed his unique skills.
One idea could be Naruto having to deal with a new and powerful enemy while still adjusting to his role as the 5th Hokage. Maybe this enemy has a unique jutsu that can disrupt the village's chakra network. Another idea is Naruto using his new position to reform the shinobi education system in the village. He could introduce new training methods that focus on teamwork and moral values as well as combat skills.
One idea could be that Sakura becomes Hokage first. Naruto goes on a long-term mission and during his absence, Sakura steps up and proves herself as a great leader. She implements new medical ninja programs in the village. When Naruto returns, he is proud of her and they work together to make the village even better.
One idea could be Naruto and Sasuke teaming up to face a new, powerful and ancient threat that even the combined might of the Hidden Villages can't handle easily. They have to use their unique skills and the bond they've reforged as Hokage and his equal.