Well, some fanfictions might have a plotline where they face a new threat to the village as a married couple. They have to use their combined skills and their relationship to overcome it. Also, there could be a plotline about them building a new home together, deciding on the layout and all the little details that come with it. This would show their teamwork and how they understand each other's needs.
One interesting plotline could be them going on a mission together as a married couple. It would be different from their solo missions as they have to rely on each other in a new way. Another could be Hinata introducing Naruto to some of the more traditional Hyuga family customs now that they are married.
There are several great plotlines. For instance, a fanfic could focus on Hinata's role as the Hokage's wife. How she represents the village at diplomatic events, or how she uses her influence to promote peace. Another plotline could be about them trying to balance their family life with their ninja duties. Maybe Naruto has to be away for a long mission and Hinata has to take care of everything at home, or vice versa. This would explore the challenges they face in their married life.
One interesting plotline could be Hinata becoming a powerful ninja in her own right and protecting Naruto instead of the other way around. For example, she could master a new and unique jutsu that saves Naruto from a powerful enemy.
One plotline could be that Hinata sees Naruto getting a lot of attention from other female characters in the village. This makes her jealous as she has deep feelings for him. For example, when Naruto is invited to a party by a group of girls and Hinata overhears them talking about how great he is. She starts to doubt if she has a chance with him and her jealousy grows.
Another plotline could be them working together to improve relations between different clans in the village. Since Naruto is from the Uzumaki clan and Hinata is from the Hyuga clan, their marriage can be a catalyst for uniting the two clans and by extension, all the clans in the village. They might face opposition from traditionalists, which makes for an exciting story arc.
Well, in some fanfics, there's a plotline where Hinata loses her memory and Naruto has to make her fall in love with him all over again. It's a classic but still very engaging. There are also stories where they are arranged to be married for political reasons at first, but then they actually fall in love for real during the process. And a really unique one is when Hinata becomes a super powerful ninja overnight and Naruto has to deal with his feelings of being a bit overshadowed while also being proud of her.
One interesting plotline could be Caroline and Klaus adjusting to living in a new supernatural - friendly community as a married couple. They might face challenges from old enemies who are not happy about their union.
A common plotline is them starting a family. For example, in some fanfictions, Kagome discovers she is pregnant. This brings a whole new set of challenges and joys as they prepare for the arrival of a new life. They have to think about how to raise a half - demon child in their world, which is full of danger and prejudice.
One interesting Naruto noticed Hinata fanfiction could be 'The Unseen Bond'. In this story, Naruto starts to notice Hinata's small acts of kindness towards him during their missions. He begins to see her in a new light and realizes how much she truly cares for him.
One interesting fanfiction could be about Hinata's journey to become stronger to stand beside Naruto. In this kind of story, Hinata might train secretly and then surprise Naruto with her new skills. Another could be a story where Hinata and Naruto get lost in a mysterious forest together and have to rely on each other to find their way out. It would be full of their cute interactions and Hinata's shy but determined nature.
There might be a fanfiction where Hinata discovers a new 'drug' - like substance in the Hidden Leaf's forest that has unique chakra - enhancing properties. She then has to decide whether to share it with Naruto and the rest of the village or keep it a secret for safety reasons. It could involve a lot of moral dilemmas and character development.
One interesting fanfiction could be about Hinata and Sakura teaming up for a special mission. In this story, they might start off with some misunderstandings due to their different personalities but then gradually learn to work together and become great friends. They could combine their unique skills, Hinata's Gentle Fist and Sakura's medical ninjutsu and brute strength, to overcome the challenges in the mission.