What are some interesting plot ideas for a 'Naruto Soul King' fanfiction?

One plot idea could be Patty somehow getting transported to the Naruto world and using her Soul Eater abilities to fight alongside the ninjas. For example, her weapon skills could be a great asset in battles against the Akatsuki.

One idea could be a crossover where Naruto characters gain the abilities of King of Fighters fighters. For example, Naruto could learn Kyo Kusanagi's fire-based moves and use them in his battles. Another plot could involve a tournament in the Naruto universe where the rules are based on King of Fighters. Characters from both universes would compete, leading to some epic battles and unexpected alliances. A third idea might be that Orochimaru is interested in the power of the Orochi from King of Fighters and tries to bring it into the Naruto world, causing chaos.

A plot could involve a shamanic tournament in the Naruto world, similar to the one in Shaman King. Naruto, Sasuke, and other ninja characters participate, and Anna is brought in as a special guest or judge. Along the way, Naruto discovers new powers within himself that are related to shamanic energy, and he has to learn how to control them with Anna's help.

One idea could be that Naruto has Arthur's leadership skills and uses them to unite the ninja clans in a new way. He might also inherit Arthur's sense of justice and chivalry, which would make him approach battles and conflicts differently.

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.

Perhaps Naruto, as an Uchiha, has a mission to retrieve a powerful artifact that has ended up in the Soul Eater world. There he meets Moka and at first they are at odds because of their different goals. But as they face various challenges together, they start to understand and respect each other, and eventually fall in love. Their relationship could then be the driving force to overcome the final obstacle, which is a powerful demon that wants the artifact for itself.

Perhaps the King of Storms is a being that can travel between dimensions, and it has a special interest in the unique powers of Fairy Tail and Naruto. It starts kidnapping powerful characters from both worlds to study them. So, the remaining heroes from Fairy Tail and Naruto must team up, enter the dimension of the King of Storms, and rescue their friends. Along the way, they face various challenges and discover new powers within themselves.

One idea could be that Naruto discovers a hidden power within himself that allows him to communicate with the Monster King. They form an unlikely alliance to fight a common enemy, like an ancient evil that threatens both the ninja world and the monster realm.

One idea could be a story where the main character discovers a hidden power within their soul that has the potential to either save or destroy the world in the Soul Eater universe. They then have to struggle with the moral implications of using this power.

Maybe an OC that has a special ability related to time. They can slow down time briefly during a fight. But this power comes with a cost, like it drains their soul energy quickly. The fanfiction could explore how they learn to control this power and balance its use while also dealing with the normal challenges at the DWMA, such as making friends and passing classes.