A possible fanfiction could be about a character from Naruto being summoned to the world of Smite by Hel. She could have an ulterior motive, like using Naruto's chakra for her own dark purposes. Naruto, not understanding the new world at first, has to quickly adapt and use his skills to either escape Hel's clutches or find a way to work with her to solve a greater problem that affects both his world and the Smite world.
In a Naruto and Hel Smite fanfiction, it could be set in a scenario where the power balance in the Smite world is disrupted. Hel, seeing Naruto's power from another dimension, decides to make a deal with him. Naruto, being the hero he is, is hesitant but realizes that by working with Hel, he might be able to save both his world and the Smite world from an impending doom that is slowly spreading across both realms.
To write a good fanfiction, do a lot of research on the Naruto universe and the Smite game. For the Naruto part, study the different jutsus, the relationships between characters, and the overall theme of friendship and growth. In Smite, understand the mechanics, the gods, and how Hel fits into the game world. Then, start with a strong hook, like Naruto suddenly appearing in the Smite world and being confronted by Hel. Develop the story from there, making sure to keep the characters' personalities true to their original sources.
A cool Naruto and Smite fanfiction idea could be a time - travel story. A Naruto character, like Sasuke, travels to the Smite world and has to learn the ways of the gods to get back home. He could form alliances with certain gods based on their similar personalities or powers. For instance, he might team up with Loki because of their shared penchant for trickery. Another concept could be a story where the Nine - Tailed Fox in Naruto is actually related to a powerful beast in the Smite world, and this connection causes all sorts of chaos and revelations in both universes.
One idea could be to have characters from Naruto end up in the world of Danmachi. For example, Naruto himself could find his way into the dungeon and his ninja skills would be put to the test against the dungeon monsters. His shadow clone jutsu could be used in interesting ways, like sending clones into different dungeon levels to scout or fight. Another idea is to have the concept of chakra introduced into the Danmachi world. This could change the way adventurers fight and level up. Maybe some of the Naruto characters could train the Danmachi adventurers in new combat techniques.
One idea could be a crossover where Naruto is somehow transported to the Star Wars universe and meets Padme. Maybe he uses his ninja skills to protect her from the Sith.
Another concept is that Naruto is sent to Middle - earth. There, he could use his ninja skills and chakra powers. He and Gandalf could team up to fight Sauron. Naruto's ability to make friends and inspire others would be really useful in uniting the different races of Middle - earth against the common enemy.
A more complex idea is that the Matrix is used to create a virtual training ground for the shinobi. They enter the Matrix to practice their skills in a more controlled environment. However, they soon realize that there are some dark secrets within the Matrix, and Naruto has to lead the way to uncover the truth and free those who are trapped inside.
Another possibility is that Naruto visits the Townsville, the city where the PPG live. He might be confused by the modern technology there compared to his own world. The PPG could teach him about it while he shows them some of his ninja skills like tree - climbing and water - walking.
A third idea could be a story where Naruto's clones are mistaken for some kind of superpower by the Thundermans. Max might be intrigued and try to figure out how to do it himself. Meanwhile, the Thundermans could teach Naruto about modern technology which he has never seen in his own world. This could lead to some really interesting and comical situations as they try to understand each other's worlds.
Another possibility is that Pokemon exist in the Naruto world. Some ninja could have Pokemon as partners instead of traditional ninja animals. For example, Sasuke could have a Dark - type Pokemon like Umbreon that would match his cool and mysterious personality. And the Pokemon battles could be incorporated into the ninja battles, adding a new layer of strategy.
One idea could be a crossover where Naruto characters gain the abilities of Needless characters. For example, Naruto could get the power of Adam Blade's regeneration. It would be interesting to see how he uses it in battle, especially against tough foes like Pain or Madara.