It could be a passionate fan who loves the shinigami arc so much that they take on the role of a reading agent. They read all the fanfictions in this arc and share their thoughts with other fans.
Perhaps a self - appointed critic within the fan community. This person has a deep knowledge of the shinigami arc and its lore. They read through the fanfiction, looking for things like how well the new stories adhere to the original arc's concepts. They might point out if a character's behavior in the fanfiction is inconsistent with how they are in the official shinigami arc. They also give feedback to the writers to help them improve their work.
The 'reading agent of the shinigami arc fanfiction' might be a concept where there is a virtual or even a real - life person acting as an agent. This agent's job could be to promote the fanfiction of the shinigami arc. They might read through different works, select the best ones and then share them with a wider audience, perhaps on social media platforms or dedicated fanfiction websites. This would help to increase the visibility and popularity of the shinigami arc fanfiction among fans.
Kakashi could be a popular character in 'shinigami naruto fanfiction'. His intelligence and combat skills could be enhanced by shinigami abilities. He might be the one to first discover the existence of shinigami in the Naruto world and then try to figure out how to use or counter their powers.
Maybe it's a new villain created specifically for the fanfiction. This villain could have powers that are extremely dangerous to Naruto, like the ability to drain his chakra completely. So the Shinigami has to step in to save Naruto from this new and powerful foe.
Obviously, Naruto would be one of the main characters since it's in the title. And the Shinigami who gives the gift is likely to be another important character.
Naruto is surely the central character in this fanfiction. Given the title, the Shinigami is another key figure. It's possible that characters like Kakashi could also play important roles. Maybe he serves as a mentor to Naruto in understanding the powers and responsibilities that come with being the champion of the shinigami. Also, villains or antagonists related to the shinigami's realm might be introduced as main characters to oppose Naruto.
Since it's a Naruto - based fanfiction, Naruto is likely to be one of the main characters as he is the Jinchuuriki. There might also be other characters from the Naruto universe such as his friends like Sasuke, Sakura, etc. who could be involved in the story related to Naruto's connection with the Shinigami.
Obviously Naruto would be one of the main characters, as the title implies he is the son of the Shinigami. There might also be other Naruto -verse characters like Sasuke, Sakura, and Kakashi who could play important roles. Maybe the Shinigami itself might be a character in some form, either as a physical presence or a guiding force in Naruto's life.
Apart from Naruto and the Shinigami, there could be other characters from the Naruto universe. For example, Sasuke might be involved. He could be either jealous of Naruto's new blessing or he could end up being an ally in Naruto's journey with this new power. Also, Kakashi could be there to guide Naruto in understanding and using the power given by the Shinigami. Maybe there are also some original characters created specifically for this fanfiction that are related to the Shinigami's realm or have some connection to Naruto's new situation.
Obviously Naruto would be one of the main characters since the title implies he is the substitute shinigami. There might also be other characters from the Naruto universe, like Sasuke or Sakura, who could be involved in Naruto's new role. They might either support him or be skeptical of his newfound powers and responsibilities.
Obviously, Naruto is one of the main characters. And of course, the Shinigami King. There may also be other characters from the Naruto series who interact with Naruto in the context of his relationship with the Shinigami King, like Sasuke or Kakashi.