It could be Naruto and Ichigo. Since it's a crossover of the two series, these two popular protagonists would likely play important roles in the fanfiction.
It could be Naruto himself, if the fanfiction is about him obtaining Soul Reaper powers. Maybe Sasuke could also be involved, perhaps as a rival who also gets some sort of power related to Soul Reapers. And there could be characters from the Soul Reaper side like Ichigo making an appearance in the Naruto world.
Well, it could be about a fictional academy where characters from Naruto and Soul Reaper universes come together. Maybe it has students learning special skills from both worlds, like Naruto characters learning about soul reaping and Soul Reaper characters learning ninja techniques.
Naruto is often one of the most popular characters. His tenacity and unique abilities make him a natural fit for fanfiction. Fans love to see how he would interact with the new setting of the Soul Academy and what new challenges he could overcome there.
One main theme is power combination. Naruto's ninja abilities combined with Soul Reaper powers. Another could be the exploration of different worlds. Naruto traveling between the Naruto world and the Soul Society.
Since it's a Naruto - based fanfiction, Naruto himself is likely one of the main characters. There may also be other familiar characters from the Naruto series like Sasuke or Sakura, who could interact with Naruto in this new scenario involving the reaper of death.
There could also be characters like Sasuke. He might be involved in the story as Naruto's friend or rival. Maybe he has his own encounters with the Death Reaper or gets affected by Naruto's actions regarding the Reaper.
In addition to Naruto, characters like Sakura could be part of the story. She might be involved in Naruto's quest for justice in some way, maybe as a healer for those affected by the unjust actions. Also, villains from the original Naruto series could make appearances as the ones that Naruto has to bring to justice, such as Orochimaru or Pain. Their presence would add conflict and challenges for Naruto as he tries to uphold justice in the fanfiction.
Probably, there would be some well - known members of the Soul Reaper crew like Ichigo or Rukia. And from the Pokémon Reborn side, it could be the main player character in the game or some of the important gym leaders. They might come together due to some strange event that links their two worlds, and then they become the main characters who drive the story forward, facing various challenges and enemies along the way.
It could be a powerful Hollow that has somehow broken free from the normal Hollow hierarchy and is causing chaos in the Soul Society. This Hollow might have a special ability that makes it difficult for the Soul Reapers to defeat it, and Naruto, as the new Soul Reaper, has to figure out a way to stop it.
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.