Maybe a story where some Digimon are brought to the Naruto universe. They would have to adapt to the ninja world, and perhaps some Digimon abilities could be mistaken for new jutsu. For example, a Digimon with the ability to fly might be seen as having a very advanced wind - based jutsu.
Maybe the Digimon are in the Naruto world, and a female Naruto has to protect them from the shinobi who see them as a threat. This could lead to some interesting battles and alliances. For example, she might team up with some of the more open - minded shinobi to keep the Digimon safe. And along the way, she could discover new jutsu inspired by the Digimon's powers.
Well, a great idea for a pokemon and digimon fanfic could be a story about a new type of evolution. What if there was a way for Pokemon and Digimon to combine their powers during evolution? For example, Pikachu could combine with Agumon and evolve into a completely new and powerful creature. It would be really exciting to explore how such an evolution would change their abilities, appearance, and relationship with their trainers or tamers.
One idea could be that Naruto is banished from the Hidden Leaf and somehow ends up in the Digimon world. There, he might form a bond with a Digimon like Agumon. He could use his ninja skills along with the Digimon's powers to face new threats. Another idea is that the banishment was a setup by an enemy who wants Naruto in the Digimon world to disrupt some kind of balance there.
Another interesting concept is that some of the Digimon end up in the Naruto universe and are mistaken for strange summons. Naruto befriends them and helps them find a way back home. In the process, he learns about their unique abilities and how they can be used in battles. For example, a Digimon like Gatomon could use her speed and claws in combat alongside Naruto.
One idea could be a story where the trainers of Pokémon and the Tamers of Digimon have to team up to save both their worlds from a common threat. Maybe a powerful virus that affects both Pokémon and Digimon data.
A third idea is a love triangle in the Digimon world. A Digimon is in love with a human, but at the same time, another Digimon also has feelings for the same human. This could lead to a lot of drama, with the two Digimon competing for the human's affection, and the human having to decide between the two different worlds they represent.
Maybe in this fanfiction, the Digimon are drawn to Naruto's world. The ninjas in Naruto's world are initially suspicious of these strange creatures. But as they learn more about the Digimon and their fight against the evil forces in the Xros Wars, they decide to help. And Naruto could teach the Digimon some of his ninja techniques, like how to use chakra.
One interesting crossover could be Naruto characters getting Digivices and having to learn how to handle Digimon partners. For example, Naruto himself might get a Digivice and his boisterous personality could lead to some really exciting adventures with his Digimon. Maybe his Digimon would be a fire - type, like Agumon, and they would have to work together to defeat enemies that threaten both the Digital World and the Hidden Leaf Village.
One idea could be a time - travel fanfic where Naruto or Sasuke go back in time and try to change certain events. This would allow for a lot of creative storytelling as they interact with their younger selves and try to prevent future tragedies.
One idea could be to create an alternate universe where Naruto has a different elemental affinity from the start. For example, instead of wind, he has lightning. Another could be a fanfic focused on the relationships between the characters outside of the main plot, like how Sakura and Ino rekindle their friendship in a more in - depth way. Or you could write about Naruto's training journey with a different mentor, say Jiraiya's long - lost brother who has a completely different teaching style.