Perhaps the White Walkers are summoned accidentally in the Naruto universe. The ninja clans then have to put aside their differences and work together. The plot could involve some of the Naruto characters trying to understand the magic of the White Walkers and find a way to stop their spread. They might also discover that some of their own jutsu can be modified to combat the icy threat of the White Walkers. For example, Fire - based jutsu could be crucial in melting the White Walkers' ice.
A plotline could be that a character from the Naruto world travels to the world of the White Walkers. Maybe Naruto himself goes there out of curiosity or to stop a greater threat. He has to adapt to the different rules and powers in that world. He could try to make alliances with the beings there who are against the White Walkers. At the same time, back in the Naruto world, his friends are preparing for a possible invasion by the White Walkers, not knowing if Naruto will be able to stop them at the source.
One possible plotline could be that the White Walkers invade the Naruto world. Naruto and his friends have to figure out how to fight them, maybe using their chakra in new and creative ways.
A plotline could involve Islamic mythology or figures somehow making their way into the Naruto universe. Maybe an Islamic - inspired spirit or entity appears in the Hidden Leaf Village and has to be dealt with, and the characters learn about Islamic beliefs in the process.
One possible plotline could be Naruto ending up in Alois' world and having to adapt to its different rules and power dynamics. He might use his ninja skills in unexpected ways to survive and make a name for himself.
A possible plotline could be Naruto and his friends being transported to the WW2 era. They then use their ninja skills to try and stop the war. Or perhaps they side with one of the Allied forces and help them in their battles. Another plotline could be that a powerful Naruto villain teams up with a WW2 dictator and they create chaos together. The heroes have to then find a way to defeat this unholy alliance.
A plotline for a Naruto Keyblade fanfic could start with Naruto finding a strange Keyblade - like object during one of his missions. As he tries to figure out what it is, he accidentally activates it and is sent to a different realm. In this realm, he meets other Keyblade wielders who help him understand the power of the Keyblade. Meanwhile, back in the Naruto world, his friends are worried about his disappearance and start searching for him. Naruto then has to master the Keyblade and find a way back home while also dealing with any threats in the new world.
A possible plotline is that a powerful villain threatens both Naruto's world and Alita's world. They are brought together by a mysterious force to stop this villain. Along the way, they face many challenges as they try to understand each other's powers and cultures. For example, Alita may not understand the concept of ninjutsu at first, and Naruto may be baffled by her mechanical body.
I'm not sure about a specific 'naruto white walker fanfic' off the top of my head. You could try searching on fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide variety of fan - made stories.
One possible plotline could be Naruto trying to find a way to visit the Harry Potter world. He might search for some kind of magical portal or a powerful spell that can transport him there. Another plotline could be Naruto using the ideas from Harry Potter books to improve his ninja techniques. For example, he could learn about the concept of wandless magic and try to apply it to his chakra control.
A plotline could involve Naruto being influenced by some outside factor, like a bad rumor about Hinata, and starts to bully her. Hinata, on the other hand, might initially be very hurt but then decides to prove herself to Naruto. As time passes, Naruto discovers the truth and feels guilty for his actions. It could be a story of redemption and growth for Naruto and a story of strength for Hinata.
A plotline might involve Rosalie getting lost in the Naruto universe. Naruto, being the kind - hearted hero he is, decides to help her find her way back home. Along the way, they learn about each other's worlds. Rosalie could teach Naruto about the unique aspects of being a vampire, like her super speed and strength, while Naruto shows Rosalie the power of chakra and the importance of ninja values.
One possible plotline could be that Fuuka is a new character in the Naruto universe. She meets Naruto during one of his missions, and they develop feelings for each other over time. Eventually, they share a kiss. Another could be that Fuuka has some special power or knowledge, and Naruto needs her help. As they work together, the relationship deepens and leads to a kiss.