One idea could be that Hinata runs away due to family pressure to marry someone she doesn't love. Naruto then sets out to find her. Along the way, they both discover new things about themselves and their feelings for each other. Maybe they end up in a hidden village where they have to work together to survive and in the process, their bond deepens.
Perhaps Hinata runs away because she feels she's a burden to Naruto. In the fanfiction, Naruto is determined to prove her wrong. He follows her trail and finds her in a forest. There, they encounter some mythical creatures. As they fight side by side to protect each other, Hinata realizes that Naruto truly cares for her and she decides to return with him, stronger and more confident in their relationship.
Maybe the main character in the HTTYD runaway fanfiction runs away due to a misunderstanding. They think they've accidentally caused harm to their dragon or their village. As they run, they discover a long - lost dragon lair filled with ancient secrets. This discovery could lead them on a journey to redeem themselves and bring back valuable knowledge to their people.
One idea could be Naruto, as a kitsune, having to protect Hinata from an ancient evil that targets her because of her special Byakugan powers. The kitsune powers of Naruto could add an interesting twist to the battles and their relationship.
One idea could be that Naruto and Hinata are colleagues in a modern corporate setting. Naruto is the energetic and ambitious new hire, while Hinata is the shy but highly skilled employee. They get paired on a big project and gradually fall in love as they work together.
Maybe in the fanfiction, the Kyuubi has a soft spot for Hinata. Since Hinata is always so kind - hearted and gentle, the Kyuubi starts to protect her in its own way. This could create some interesting situations, like when Naruto is in danger, the Kyuubi takes over not just to save Naruto but also because it doesn't want Hinata to be sad. It would be a different take on the relationship between the three.
A cute plot idea would be a slice - of - life story. Hinata is trying to bake a special cake for Naruto's birthday. But things keep going wrong, like the oven breaks and she has to use her ninja skills to fix it. Meanwhile, Naruto is completely oblivious to what she's doing and in the end, he's really touched by her effort.
One idea could be exploring their first year of marriage. They might face challenges like how to balance Naruto's Hokage duties with family time. Hinata could struggle with being in the public eye as the Hokage's wife.
Well, perhaps a plot where Naruto and Hinata accidentally switch bodies. This would lead to a lot of comical situations as they try to adapt to each other's lives. Hinata would have to deal with Naruto's boisterous friends and Naruto would have to navigate Hinata's shy family interactions. But through this, they also learn more about each other and their respective struggles.
One idea could be a story where Naruto, Hinata, and Shion have to team up to protect the Hidden Leaf from a new and powerful enemy. Shion could use her unique powers, Hinata could support with her Byakugan and gentle fist techniques, and Naruto would be the main force with his Nine - Tails chakra.
One plot idea could be that Hinata is kidnapped by a rogue ninja group who wants to use her Byakugan for their own evil purposes. Naruto then embarks on a dangerous mission to rescue her, facing various challenges along the way.
Perhaps there could be a plot where an enemy tries to target Hinata because of her pregnancy, seeing it as a way to get to Naruto. Naruto then has to go to great lengths to protect her and their unborn child. This could lead to some intense battles and also show the deep love Naruto has for Hinata and their future family.