One idea is that Mizore and Shirayuki's world is on the verge of destruction due to a natural disaster. Naruto, with his ninja skills and determination, tries to help them stop it. However, they soon find out that the disaster was actually caused by a dark wizard from the Naruto universe who escaped there long ago, and now they have to defeat him to save both worlds.
A fanfic might explore the idea of Naruto being sent to the world of Mizore and Shirayuki for a mission. He has to adapt to their world while also helping them with a local problem, like a dark force threatening their land. This could involve a lot of character development as Naruto learns about their cultures and they learn from his ninja ways.
Maybe in the fanfiction, Naruto and Mizore are brought together by a prophecy. They initially don't trust each other, but as they work towards fulfilling the prophecy, they discover that they have a deep connection. Their love story could unfold as they learn more about each other's pasts and dreams, and they end up falling in love while saving their world from a great evil.
One possible plot could be that Mizore, who is from a different world or dimension, somehow ends up in the Naruto universe. Naruto, being the curious and friendly ninja he is, decides to help her find her way back. Along the way, they face various challenges together and learn about each other's powers and cultures.
Some fanfictions focus on what - if scenarios. What if Tsukune was actually a powerful vampire from the start? How would that change his relationship with Mizore? There are also fanfictions that deal with challenges to their relationship, like a rival for Tsukune's affections who is also a powerful monster. This creates a lot of drama and tension in the story as Mizore has to fight for Tsukune's love.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
The fanfic could be about a dimension - hopping adventure. Naruto accidentally ends up in Mizore's world. Their first encounter is hostile as they don't understand each other. Mizore attacks Naruto with her ice powers, thinking he's an intruder. Naruto retaliates with his ninja techniques. But as they interact more, they realize they have more in common than they thought. They could be on a quest to find a way to send Naruto back home while also dealing with threats in Mizore's world.
Another plotline might be a love story between Shirayuki and a character who has always been on the opposite side in the Naruto universe. Their relationship could be a complex one, full of misunderstandings and moments of connection as they try to bridge the gap between their different loyalties.
One idea could be that Naruto discovers a hidden power within Shenron. For example, instead of just granting wishes in the traditional way, Shenron could offer Naruto a special training regime that enhances his already powerful jutsu. This could lead to Naruto facing new and even stronger enemies.
Another plot could be Samui getting involved in a time - travel adventure. Maybe she gets sent back in time to the era when the ninja world was just being formed. She then has to use her modern - day knowledge and skills to survive in that primitive yet dangerous time, and also has the chance to change the course of ninja history in small ways.
One idea could be that Tayuya, after being defeated, has a change of heart and teams up with Naruto to fight a new common enemy. They could learn from each other's skills and jutsu.