The characters would have interesting interactions. Naruto, being the energetic and friendly hero, would likely make friends quickly in the Demon Slayer world. He'd probably be fascinated by the swords and the concept of demon slaying. And the Demon Slayer characters would be intrigued by Naruto's shadow clones and other jutsus. They could learn from each other and develop new strategies for fighting enemies. For example, Naruto could show them how to use mass - produced clones for distraction while the Demon Slayers attack from a different angle.
It could blend the two worlds by having a common enemy. Let's say a powerful being that threatens both the ninja world and the world of Greek mythology. Percy and the Naruto characters would have to team up. The Mokuton abilities could be used in unique ways to fight this enemy. For instance, creating huge wooden barricades to hold off the enemy's attacks while Percy uses his powers to strike from a distance. The two worlds' cultures and powers would mix as they strategize together.
In a Naruto - Vikings crossover fanfiction, the power systems could be really interesting to combine. The Vikings have their physical strength and combat skills, while the ninja in Naruto have chakra and jutsu. Maybe a Viking could be exposed to chakra and start to develop their own unique form of jutsu based on their Viking heritage. For instance, a Viking with a connection to Thor could use lightning - based jutsu in a way that's different from how a normal Naruto character would. This would create a whole new dynamic in the story as the Vikings and Naruto characters learn from each other's powers.
A possible way to blend the two in a fanfiction would be through the power systems. In Naruto, there's chakra, and in Soul Eater, there are souls and soul wavelengths. The fanfiction could create a connection where chakra is related to the strength or quality of a character's soul. So Naruto characters with high - level chakra like Naruto and Sasuke would have very powerful souls in the Soul Eater world. Also, the different jutsu in Naruto could be adapted to deal with soul - related problems in the Soul Eater world, like using Fire Style jutsu to burn away corrupted souls.
One way is through the power systems. Naruto has chakra, while Shendu has his own brand of magic. The fanfiction could explore how Naruto's chakra could interact with Shendu's magic. Maybe Naruto could use his chakra to enhance or counteract Shendu's spells. Another aspect could be the characters' personalities. Naruto's optimistic and determined nature could contrast with Shendu's more devious and power - hungry personality, creating interesting story dynamics.
Another aspect of blending the two worlds could be the characters' personalities and relationships. Naruto's optimistic and never - give - up attitude could inspire the characters in SAO. And maybe some of the SAO characters' more tech - savvy and strategic minds could be used by Naruto characters to better understand the virtual world. This exchange of personalities and ideas would be a great way to make the fanfiction really engaging.
In this fanfiction, perhaps Sasuke could be a sort of anti - hero. He might initially be seen as a threat by the Demon Slayer corps because of his dark powers. But then, as the story progresses, he could use his Sharingan to detect demons more easily and work with the protagonists to defeat stronger demons.
One way they blend the two is through the power systems. The chakra in Naruto and the Blade system in Xenoblade Chronicles 2 can be combined in fanfictions. Maybe a character from Naruto can somehow gain the ability to resonate with a Blade, or a Blade can be powered by chakra. This creates new and exciting storylines where the rules of both universes are bent and merged.
One way is through the power systems. Naruto's chakra could interact with the magic and powers in High School DxD. For instance, a character from High School DxD might be fascinated by Naruto's ability to use chakra and it could be a starting point for a relationship in the mass harem. Another aspect could be the cultures. The shinobi culture of Naruto's world is very different from the high school and supernatural culture of High School DxD. This contrast could create interesting situations in the fanfiction.
One way is through the power system. The Susanoo's power could be compared or combined with the powers in Highschool DxD. Naruto could bring his ninja way of thinking into the Highschool DxD world. For instance, his idea of never giving up could inspire the Highschool DxD characters. And in terms of the world - building, the fanfic could have Naruto's world of ninjas and the Highschool DxD's world of demons and angels co - exist. The Susanoo could be seen as a new and fearsome power in the Highschool DxD world.
Well, the simplest way is through a magical portal. A character from either world accidentally stumbles through it and ends up in the other world. Then they have to adapt and learn about the new place while also sharing elements of their own world.