Obviously Naruto is a main character. But it could introduce new characters created specifically for this fanfiction. These could be dark figures that Naruto encounters on his journey. However, his old friends like Shikamaru might also be involved, using their intelligence to help or hinder Naruto's exploration of the darkness.
I think Naruto is the key character, but it could also feature Kakashi. Kakashi has a lot of knowledge and experience, and he might be there to guide Naruto or try to stop him from going too far into the darkness. Also, Sakura could be in it, maybe trying to bring Naruto back to the light.
Well, it could be about Naruto delving into the darker aspects of his world. Maybe he's on a journey to understand the true nature of the evil forces, or it could involve his own internal struggle with the darkness within him.
Obviously, Naruto is the central character. His friends like Sasuke and Sakura are also often involved. Sasuke might be on a journey of redemption and working alongside Naruto for peace. Sakura could use her medical skills to help those affected by war, furthering the cause of peace.
Well, Naruto is surely a main character. And depending on the plot, characters like Kakashi could be important. He's Naruto's teacher and might try to guide Naruto away from the allure of darkness. Also, Orochimaru could be a key figure. He's always been associated with dark arts in the Naruto series, and in this fanfiction, he might play a role in Naruto's exploration of the darkness, either as an ally or an enemy.
The main characters would surely include Naruto. Then, depending on the direction of the fanfiction, characters like Jiraiya could be important as he might be the one to help Naruto understand and control his dark side. There could also be some dark - themed characters that are part of Naruto's heritage or the source of his 'son of darkness' status. And of course, his friends, even if they are initially wary of him, would still be key characters as they react to Naruto's transformation or discovery of his new identity.
Most likely Naruto would be one of the main characters. Depending on the crossover, it could also include characters from the other franchise involved in the crossover.
Obviously Naruto would be one of the main characters as he is the 'King of Darkness' in this fanfiction. Sasuke could also be a main character as his relationship with Naruto is so central in the original series and would likely be explored in a new way in this dark version. Sakura might also be a main character as she may try to bring Naruto back from the dark side.
Well, Naruto would be the main character for sure, since it's about him as the god of darkness. Sakura and Sasuke could also be important characters. They might be trying to understand Naruto's new form and powers, and either help him or be in conflict with him depending on how the story goes.
In addition to the usual Naruto characters, there could be some original characters created specifically for this fanfiction. Maybe there's a mysterious figure who is either guiding Naruto towards the darkness or trying to stop him from fully succumbing to it. Another possibility is that some minor characters from the original Naruto series get more spotlight in this fanfiction and play important roles in the story related to Naruto's 'bringer of darkness' arc.
Well, it could be an original character created specifically for the fanfiction. This character might be an outcast because of their Darkness Release abilities. Maybe they are trying to prove themselves in a world that fears their power.
Most likely Naruto would still be a main character. He is the protagonist of the original series and would probably be central in this fanfiction too, as he battles against the darkness. Sasuke could also be a main character, especially if the story is about his struggle with his own dark side or his relationship with Naruto in this darker context.