A plot could involve Naruto being cursed with some kind of insanity - causing him to act erratically. Hinata, being in love with him, refuses to give up on him. She tries to find a cure while also dealing with the changed Naruto. Their relationship could become strained as Naruto struggles with his inner turmoil and Hinata tries to hold on to the Naruto she knew. But in the end, through their love and Hinata's determination, Naruto overcomes the insanity.
Another plot could be an AU (Alternate Universe) where Naruto and Hinata are in a different setting, like a modern high school. Naruto could be the popular jock type and Hinata the shy girl. They meet in a school club and their relationship develops from there. It's interesting to see how their Naruto - and Hinata - like traits are translated into a modern - day context.
A plot could involve a time - travel scenario in naruto x hinata x sakura fanfiction. Naruto, Hinata, and Sakura are sent back in time. Hinata uses her knowledge of the Hyuga clan's secrets to train Naruto in new ways, and Sakura focuses on improving her medical ninjutsu even further with the knowledge of future techniques. They all work together to change the future for the better, and along the way, their relationships deepen in unique ways.
One interesting plot could be about their family vacations. Maybe they go to a hidden hot spring village and Naruto and Hinata have to deal with Boruto and Himawari getting into little misadventures there.
Maybe in the fanfiction, Naruto discovers he has some sort of imperial lineage and Hinata is by his side as his support. They embark on a journey to unify different clans under their imperial rule. Hinata's gentle nature helps in diplomatic relations while Naruto's strength deters any would - be enemies.
One common plot is them exploring a new and exotic location. For example, they might go to a secluded beach where they can relax and enjoy each other's company away from the chaos of the ninja world.
One interesting plot could be Naruto and Hinata traveling back to the time when the Uchiha clan was still intact. They could try to prevent the massacre. Maybe Naruto, with his future knowledge and Hinata's byakugan skills, would work together to change the fate of the Uchiha, which would have a huge impact on the future of the ninja world.
One possible plot could be that the Kyuubi's chakra constantly overwhelms Naruto's mind, leading him to make rash decisions in battles. For example, he might attack his allies by mistake when the insanity takes over.
Obviously, Naruto and Hinata are the main characters. Naruto, the hero with a big heart but perhaps in this fanfiction, he has some insane tendencies. Hinata, on the other hand, is his love interest. She's the one who will likely be there to support him, understand him, and maybe even save him from his 'insane' self. There could also be other supporting characters from the Naruto universe like their friends or mentors who might play a role in how their relationship unfolds in this fan - created story.
A plot could be that in RTN, Hinata is a part of a secret organization that Naruto is tasked to infiltrate. As he gets closer to Hinata within the organization, he starts to question his mission and his feelings for her. Eventually, they have to decide whether to stay true to their original sides or choose each other.
One interesting plot could be that Devil Naruto has to protect Hinata from the dark forces that are after his newfound devil powers. Another could be a story where Hinata tries to bring out the good in Devil Naruto. For example, Hinata's kind heart might start to soften Devil Naruto's cold exterior over time.