Well, Naruto is the central figure in this 'dark naruto eats souls fanfiction'. But it could also feature characters like Kakashi. Kakashi might be the one who initially discovers Naruto's dark secret and tries to figure out what to do about it. Then there could be villains in this story too. Maybe some new dark entities that are either influencing Naruto or are in competition with him for souls. And of course, Naruto's friends from the original series would play important roles as they either struggle to accept this new Naruto or fight against him.
Obviously Naruto himself would be a main character, in his dark form. There might also be other characters like Sasuke. Sasuke might be in a position of either trying to stop Naruto or joining him in his dark deeds. And Sakura could also be there, perhaps as a voice of reason trying to bring Naruto back from the darkness.
Well, it could be about a dark version of Naruto having the power or the need to consume souls. Maybe it's a twisted take on his character where he's no longer the hero we know, but a being driven by some dark force to feed on souls for power or survival.
It could be a powerful spirit that is enraged by Naruto's soul - eating. This spirit might have been protecting the souls in the first place and now sees Naruto as a great threat.
Well, Naruto is obviously one of the main characters since it's in the title. He's the one doing all the eating. There might also be his friends like Sasuke and Sakura. Sasuke could be annoyed by Naruto's eating habits, while Sakura might be worried about the effects of all that eating on Naruto's health.
Sasuke, on the other hand, would be more calculating. He'd study the enemies' patterns carefully. In the Dark Souls setting, he'd likely focus on finding the most powerful weapons and armor. He might even try to master some of the Dark Souls - specific combat techniques. His Sharingan would give him an edge in quickly analyzing the situation, much like it does in the Naruto series when he faces tough opponents.
Perhaps in the 'naruto eats souls fanfiction', Naruto is cursed by an evil force. This curse makes him uncontrollably eat souls. He then has to struggle to find a way to break the curse while dealing with the consequences of having eaten souls, like the anger of the spirits' friends or families.
There's also the Fire Keeper. She plays a crucial part as she is associated with the bonfires and provides guidance to the Ashen One. And then there's the Soul of Cinder, which is a significant entity in the novel's plot. It represents the combined wills of all the Lords of Cinder who have failed in their duties to link the First Flame in the past.
Obviously, the Darkwraiths themselves are main characters. They are often depicted with their dark armor and menacing presence. Their actions and motives drive many of the stories.
There's also a possibility that some of the minor RWBY characters become the main focus in this fanfiction. For instance, characters like Jaune or Pyrrha could be central to the story if the curse has something to do with their past or their abilities. Maybe Jaune discovers that he has a special connection to the curse because of his family's history in Remnant, and he has to take on a bigger role to deal with it, much like how in Dark Souls the player character often has a unique destiny related to the world's curses.
I'm not entirely sure as there could be many different interpretations in a fanfic like this. It might be a very unique and out - of - the - box concept where Naruto, in this fan - created story, has the ability to consume souls for some reason, perhaps to gain power or to defeat enemies in a different way than in the original Naruto story.
Then there are the bosses like Ornstein and Smough. While they are antagonists, they are also main characters in a way. The graphic novels could show their origin stories, how they came to be guardians of their respective areas and why they are so feared. Their designs in the graphic novels are likely to be as imposing as they are in the game.