Since it's a Naruto - based fanfiction, Naruto is definitely a main character. In addition, it could feature the Hokages, as they often play important roles in Naruto's life and they might be involved in the mystery of the Shinigami's left hand. Also, villains from the Naruto series could show up. For example, Orochimaru might be interested in this power of the Shinigami's left hand and try to take it from Naruto, making him a major character in this fanfiction as well.
Well, in the Naruto universe, the Shinigami is a very mysterious and powerful entity. In this 'Left Hand of the Shinigami' fanfiction, it could be that Naruto discovers something about the Shinigami's left hand that no one else has. Maybe it has a hidden seal or a power that can be harnessed. It could also lead to a new arc in Naruto's life where he has to deal with the consequences of this discovery, like facing new enemies who are also interested in this power. And he might have to figure out how to control this newfound connection to the Shinigami's left hand.
Obviously Naruto would be the main character as the title mentions him. There might also be Sasuke, as he often has a role in Naruto - related stories. Kakashi could also be involved, perhaps as a mentor to Naruto in understanding and controlling the power of the Shinigami's right hand.
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.
Well, Naruto himself is obviously a main character in most of these fanfictions. Since it's about Naruto and the Shinigami, he's the central figure around which the story revolves.