It's possible that Kakashi could be a main character as well. His experience and wisdom would be valuable in the face of the threat of the 100 demons. He could be mentoring the younger characters on how to deal with the demons, and his Sharingan might give him some unique insights into the nature of these demonic entities.
In the 'dancing with demons naruto fanfiction', Naruto is almost surely a main character. Given the nature of the title, he could be the one who is either lured into the world of demons or is trying to protect others from them. Sakura might also be involved as she is one of Naruto's closest friends. Her medical skills could be useful in a story full of dangerous demons. And of course, Kakashi could be there as well. His experience and wisdom would be valuable assets in dealing with the demons and guiding Naruto and the others through this strange 'dance' with the demons.
Naruto is likely to be one of the main characters, as the title implies his connection to the 'god of demons' concept. His friends like Sasuke and Sakura could also be important characters, as they might be involved in Naruto's journey with his new identity.
Obviously Naruto would be the main character. He is the one doing the singing. And then there would probably be some demons as well. Maybe a powerful demon lord who is initially intrigued by Naruto's singing and then becomes either an ally or an adversary depending on how the story unfolds.
It could be the Nine - Tailed Fox. Since it already has a connection to Naruto, it might take him under its wing in a more fatherly or family - like way. Another possibility is some of the lesser - known demons from the Naruto lore that haven't been explored much.
The main characters would most likely start with Naruto. His character would be central to the story. Alongside him, we might see the Hokage at the time also playing a role. Additionally, there could be a group of shinobi who are specialized in dealing with demons that Naruto teams up with. And perhaps some of the villains or demons themselves could be considered main characters in a sense, as they drive the conflict in the story.
It could be an ancient demon that was sealed away long ago in the Land of Demons but has now broken free. This demon could be extremely powerful and have a vendetta against the ninja world.
A demon lord could be another main character. This character would be very strong and cunning, always devising plans to overthrow the gods or gain more power in the demon realm. Maybe he has some tragic backstory that led him to become so evil.
Well, in a graphic novel like this, there could be a group of characters. There might be a wise old sage - type character who knows a lot about the demons and can guide others. There could also be a renegade demon who decides to side with the humans against the other demons for some reason. And of course, there may be an ordinary human who gets caught up in the whole mess of the 1000 demons and has to find a way to survive and make a difference.
The main antagonist could be a demon who is threatened by Naruto's singing ability. This demon might be using people's inner demons to gain power, and Naruto's singing that calms those demons is ruining its plans.
It could be the other demons who oppose the Queen of Demons' newfound alliance with Naruto. They might see Naruto as a threat to their way of life or as a tool that the Queen of Demons is misusing. So, they would try to break their bond and destroy Naruto.