In naruto kuchiyose fanfiction, an interesting aspect could be the relationships between Naruto and his summoned creatures. For instance, he might form a deeper bond with one of his summons, like the toads. This could lead to the summon having a greater influence on Naruto's growth as a ninja. Additionally, some fanfictions might explore how Naruto's kuchiyose jutsu evolves over time, perhaps allowing him to summon larger and more powerful versions of his usual summons.
One idea could be a fanfic where Naruto discovers a new and powerful summon that no one has ever seen before. This summon could have unique abilities that help Naruto in a crucial battle against a powerful enemy.
Obviously Naruto himself is a very popular character in naruto kuchiyose fanfiction as the main user of the kuchiyose jutsu. Jiraiya is also popular since he taught Naruto about the jutsu. And the toads like Gamabunta are often featured as important characters as well, given their role in Naruto's summoning adventures.
One interesting idea could be the combination of Naruto's ninja skills with mecha technology. For example, Naruto might use his chakra to power up the mecha in unique ways. Another idea could be the new enemies that are created specifically for this mecha - Naruto concept, like robotic shinobi that require different combat strategies compared to normal foes. Also, the design of the mecha Naruto itself can be really cool, perhaps with features inspired by the Nine - Tails.
One interesting idea could be the combination of Naruto's unique ninja abilities with the concept of 'beyonder' powers. For example, Naruto might use his chakra in new and unexpected ways influenced by beyonder abilities, like being able to teleport across long distances instantly, which is not a typical ninja skill. Another idea could be the interaction between Naruto and other characters from the beyonder universe. They might form new alliances or face off in epic battles that combine the rules and powers of both worlds.
In a Naruto Pokemon fanfiction, you could have a plot where the Pokemon and the tailed beasts are somehow connected. For instance, the tailed beasts were once Pokemon that got corrupted by some dark force in the Naruto world. The characters from Naruto would then have to team up with some expert Pokemon trainers to purify the tailed beasts. There could also be a tournament where Naruto characters and Pokemon trainers compete against each other, using their respective skills of ninjutsu and Pokemon training.
In Naruto helmet fanfiction, one interesting idea could be a helmet with special powers. For example, it might enhance the wearer's ninjutsu skills. Maybe it has the ability to store chakra and release it in a powerful blast when needed.
One idea could be to create a story where Naruto discovers a new and powerful fighting style from an ancient scroll. Another could be a fanfiction about a tournament among all the ninja in the Naruto universe, with unique rules and unexpected alliances. Or perhaps a story where Naruto has to fight an enemy who can copy his every move and he has to find a way to outwit them.
One idea could be a crossover where Naruto visits Equestria and meets Fluttershy. He could learn about her kindness towards animals and they could team up to protect the magical creatures there from some sort of threat. Another could be a story where Fluttershy somehow gets transported to the Naruto world and has to adapt to the more dangerous environment, while Naruto helps her understand the ways of his world.
One interesting idea could be the unique interactions between Naruto's ninja world and the monstergirls. For example, how Naruto's skills like the Rasengan might be used in situations involving monstergirls. Maybe he uses it to protect a monstergirl from other threats in the fanfiction world. Another idea could be the cultural clashes. Since Naruto has his own shinobi culture, and the monstergirls would likely have their own distinct cultures, seeing how they interact and adapt to each other can be really engaging.
A really cool fanfiction idea could be that Naruto and Elsa are both summoned by a powerful sorcerer in a different dimension. They have to work together to find a way back home. Along the way, they discover that their powers are connected in some way, like Naruto's chakra can enhance Elsa's ice powers and Elsa's ice can be used to create new jutsu for Naruto.