The characters' interactions would be a blend of different cultures and power sets. Naruto's team might be amazed by the Death Scythes in Soul Eater. They could see them as super - powerful weapons compared to their kunai and shuriken. Meanwhile, the Soul Eater characters would be intrigued by Naruto's ability to summon toads. They might ask him to summon one for them to study. And when it comes to the Juubi, characters like Kid from Soul Eater, with his love for symmetry, might be especially interested in studying the Juubi's power structure, while Naruto would be more focused on how to defeat it.
The plot could involve Naruto characters in the world of Soul Eater. Maybe Naruto's chakra could be seen as a unique form of soul energy. The Juubi's power might be something that either disrupts or enhances the balance in the Soul Eater universe. For example, the Shinigami in Soul Eater might be very interested in the Juubi's power and try to either contain or use it. And Naruto characters could have to adapt to the rules of the DWMA (Death Weapon Meister Academy), like how they deal with Kishin eggs.
Perhaps in this crossover, the concept of the tailed beasts in Naruto are related to the Kishin in Soul Eater. The tailed beasts are seen as powerful and dangerous entities, much like the Kishin. A group of characters from both universes, including Naruto, Maka, and Soul, come together to find a way to either control or destroy these powerful forces that threaten both their worlds. They would have to learn from each other's strengths and weaknesses to succeed.
One idea could be a crossover where the Juubi's power somehow gets transferred to a character in Soul Eater and they have to learn to control it. Another could be Naruto getting lost in the Soul Eater world and having to adapt to their way of fighting and dealing with souls.
There could be a really interesting fanfiction where Naruto characters possess immortal souls like in Soul Eater. For example, Naruto's strong will could be translated into an extremely powerful and unbreakable immortal soul. The ninja world's chakra system might interact with the concept of souls from Soul Eater in unique ways, like using chakra to enhance or protect the soul. Maybe Sasuke's Sharingan could have a new ability related to seeing and manipulating the immortal souls.
You can try websites like Fanfiction.net or Archive of Our Own. They have a vast collection of fanfictions covering Naruto, Juubi, and Soul Eater. Just use the search function and type in relevant keywords like 'Naruto Juubi Soul Eater crossover' to find what you're looking for.
The key elements often include the character designs. The distinct looks of Naruto characters with their headbands and unique outfits, and the edgy, cool looks of Soul Eater characters like Black Star with his star - patterned clothes. When they cross over, seeing how their styles blend or contrast can be really cool. Also, the goals of the characters play a part. Naruto aims to become Hokage and protect his village, while Soul Eater characters are often focused on collecting souls or becoming stronger in their own ways. In a crossover, these goals might intersect. For instance, they could team up to stop a villain who is threatening both the ninja world and the world of Soul Eater. And the different settings, Konoha in Naruto and Death City in Soul Eater, can create a really diverse backdrop for the story.
One popular plot is where the characters from Naruto are transported to the world of Soul Eater. They have to adapt to the new rules about souls and weapons while still using their ninja skills. Another plot could be the opposite, with Soul Eater characters ending up in the Naruto world and having to deal with things like chakra and jutsu.
You can try websites like Fanfiction.net or Archive of Our Own (AO3). These platforms have a large collection of fanfictions, including crossovers between Naruto and Soul Eater. Just use their search functions to look for 'Naruto and Soul Eater crossover' and you'll likely find many interesting stories.
The Akatsuki members from Naruto could pose as a great threat in the Soul Eater world. For example, Itachi could use his Sharingan to manipulate some of the Soul Eater characters. But then, Death the Kid with his precision and unique abilities might be able to counter Itachi's illusions. Naruto would likely try to reason with Itachi, while the Soul Eater crew is more focused on taking him down. Also, Black Star could see Naruto as a rival and constantly challenge him to prove who is stronger.