Naruto would likely be one of the main characters since it's in the title. There might also be other characters from the Naruto series like Sasuke or Sakura, who could be involved in Naruto's journey related to the 'king of darkness' concept. Additionally, new characters might be introduced that are unique to this fanfiction, perhaps some dark entities or mentors who guide Naruto in this new aspect of his life.
Obviously, Naruto is the main focus as the title implies. But there could be a whole host of other characters. Maybe there's a mysterious figure who is the originator of the 'king of darkness' concept and they become a major character in the story, guiding or manipulating Naruto. His ninja comrades from Konoha, such as Shikamaru or Ino, could also be significant as they react to Naruto's change and either support or oppose him. And who knows, there could be some anti - hero type characters who side with Naruto in his new 'king of darkness' path and become important players in the fanfiction.
Chapter 804, "Still causing trouble?", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event. The chapter gives readers a real answer by opening on He never imagined he would be scooped up like this!
Chapter 498, "How can someone be so ugly?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from .....If you don't love me, give my heart back, you traded love for my...
Chapter 538, "You Won't Get Angry No Matter What I Ask, Right?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from Su Yinwan couldn't ignore Jiang Cheng's unusual behavior any longer...
Chapter 602, "Did Our Ship Capsize Too?!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Hmph." Jiang Zhao Yuan grunted again, "Has anyone been bullying you?"....
Chapter 618, "Abandoned Again", is the clearest early answer because it turns Sister Xiao Wan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Upon hearing this, Jiang Cheng looked at Su Yinwan in disbelief.
Chapter 841, "Isn't this Daniu?", is the clearest early answer because it turns Gu Qiang's situation into a concrete plot event.
Chapter 861, "Add the Link!", is the clearest early answer because it turns Taoist's situation into a concrete plot event. Early on, At exactly ten in the morning, Jiang Li started her live stream.. By the end, Changqing curiously leaned over for a look, and his ears instantly....
Chapter 859, "I Bet She Won't Last Ten Minutes!", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event. The chapter turns that into something concrete by moving from All morning, the two little ones were quiet, not making a peep, even...
Chapter 884, "Master?!", is the clearest early answer because it turns Qixing Tower's situation into a concrete plot event.
Chapter 690, "Miss Jiang, Marry Me!", is the clearest early answer because it turns Now's situation into a concrete plot event. The setup is No wonder she had predicted she would come into some unexpected..., but the pressure keeps building through Someone was bringing money right to her door..