Yes, there might be. Fanfiction websites are filled with all kinds of creative and unique crossovers. You can start by checking popular fanfiction platforms like FanFiction.net or Archive of Our Own. Just search for 'naruto is the soul king' and see what comes up.
One possible plot could be that Naruto is somehow transported to the world where the Soul King exists. He discovers his new role as the Soul King and has to learn the rules and powers associated with it. He might use his ninja training to face the threats that come to the Soul King's realm.
Madara Uchiha could also be a great antagonist. Imagine if he came back and thought that the power of the Soul King could be used to achieve his ultimate goal of creating a world under his control. He'd be a formidable foe for Naruto, especially since he has so much experience and power already.
One idea could be that Naruto discovers he has a hidden connection to the Soul King. For example, his chakra is somehow linked to the power of the Soul King. This could lead to new abilities and a whole new arc in the story where he has to explore this connection and face enemies who want to use it for their own evil purposes.
Maybe Naruto would sell his soul to a dark and mysterious ninja who has some sort of ultimate power or knowledge. This ninja could be using Naruto's soul for some grand, but evil, plan.
There are many places to find such fanfiction. Firstly, Fanfiction.net has a large collection. Browse through the Naruto and Soul Eater sections and look for stories that specifically mention Patty. Another option is Archive of Our Own. It has a great tagging system which can help you narrow down the search to exactly what you're looking for. Some fanfiction might be about how Patty from Soul Eater could interact with the characters in Naruto, or it could be a more complex crossover story with an interesting plot.
There probably is. Fanfiction writers often come up with really creative crossovers. However, the quality can vary a great deal. Some might be really well - written with interesting plotlines that blend the Naruto and Soul Eater universes in a unique way, while others might not be as good. It's all about exploring different interpretations of the characters and their worlds.
It could be about a unique take on the Naruto universe where the concept of 'broken soul' is explored. Maybe it focuses on a character who has endured great trauma and has a fractured spirit, like Sasuke after the massacre of his clan. It might also involve some sort of dark or emotional journey for the characters.
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.
Yes, there are quite a few. You can find them on various fanfiction websites. Some might focus on Naruto somehow getting the powers of a Soul Reaper and how he uses them in the Naruto universe. For example, he could use Soul Reaper abilities like Zanjutsu to fight against the Akatsuki.