Well, first of all, the son of Kami is bound to be a main character. Then, the Shinigamis, which could be of different types or ranks. In the Naruto side of things, Naruto himself is very likely to be a main character. His positive and determined attitude could contrast with the more mysterious nature of the son of Kami and the Shinigamis. Sakura might also be a main character as she could provide medical support or her own brand of tough - girl attitude in the face of the new and strange elements introduced by the son of Kami and the Shinigamis. And there could be some original characters created specifically for this fanfic that are related to the Shinigamis or have a special connection to the son of Kami.
Obviously, the son of Kami would be a main character. And some Shinigamis would also be important. Naruto and his friends could also be main characters as they are part of the Naruto universe. They might interact with the son of Kami and the Shinigamis in different ways.
The main characters would most likely be the son of Kami, who is at the center of this fanfic concept. The Shinigamis involved would play significant roles too. In addition to them, key characters from Naruto like Sasuke might also be included. Sasuke's power - hungry nature could lead to interesting interactions with the son of Kami and the Shinigamis. Also, Kakashi could be there as a mentor - like figure, guiding the younger characters through the strange events that occur due to the presence of the son of Kami and the Shinigamis.
Chapter 891, "If You're a Man, Keep Drinking!", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Yan couldn't bother to coax these two little brats anymore.
The best chapter pointer here is Chapter 1, "I'm Not Interested in Uncultured Men". It opens with Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or... and closes on Yet before she had the chance to teach her a lesson, the male lead arrived....
Chapter 695, "Is This a Matter of Money?!", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Shang Shuyue just felt she was out of luck.
Chapter 743, "They Have Already Been Released", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. It opens with Too many people caused a commotion at Fang Family's place tonight,...
A practical answer is Chapter 20, because it turns the idea into a concrete scene. The chapter opens with Several people turned their heads upon hearing the sound and saw three..., adds pressure through Miss Su, please clarify the situation and do not slander me unnecessarily., and ends on So, he.
Chapter 867, "Then what does our child count as?!", is the clearest early answer because it turns Chen Nanyu's situation into a concrete plot event.
Look to Chapter 11 for the clearest answer. It begins with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and..., keeps building through How is it going with the Jiang Family?" The assistant looked troubled and..., and lands on Miss Qin, please accompany us to the police.
Chapter 590, "Are You Angry?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Night had completely fallen, and a chill hung in the air over Dragon...
Chapter 616, "I'm Going to Save Sister Xiao Wan!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. Early on, Since the storm had hit that morning, he had been preoccupied and out....
Chapter 808, "Dare to Spank Him?!", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event. Early on, I don't listen, I don't listen," Jiang Bufan once again started his.... By the end, I...." Just then, Jiang Bufan started wailing even louder, even....