Sakura could also be a supporter. She might see how passionate Naruto is about dancing and help him out. Maybe she uses her medical skills to make sure Naruto doesn't overexert himself while practicing those energetic dance moves. She could also design some cool costumes for Naruto's dance performances.
One interesting storyline could be Naruto entering a dance competition in the Hidden Leaf Village. This could bring out his determination and also show how his ninja skills might influence his dancing style. For example, his agility and balance from being a ninja could make his dance moves more acrobatic and unique.
Sasuke is often one of the characters. Given their complex relationship, Sasuke might see Naruto's banishment as another wrong done by the village and decide to support him in his revenge, especially if it means taking on the village's corrupt elements.
Sasuke can also be involved in some cases. Since he and Naruto are often together in many situations, Sasuke's presence might add some complexity to the relationship between Kaguya and Naruto. For example, Sasuke might be suspicious of Kaguya's intentions towards Naruto at first.
Obviously, the priestess herself is a main character. She is often depicted as having unique spiritual powers and a mysterious background. Naruto also frequently appears, as his story is intertwined with the events in the Naruto universe. Sakura could also be involved, perhaps as a friend or an ally to the priestess, using her medical skills to support the priestess in her quests.
Obviously, Naruto is the main character in most 'Naruto Ruler' fanfictions. But other characters like Sasuke also play important roles. Sasuke might be Naruto's advisor or a powerful ally in maintaining the rule. Sakura could be the head of the medical department, providing essential support to the village under Naruto's rule.
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.
Sakura might support Naruto. Despite the exile, she could believe in his innocence and try to find ways to help him. Also, Kakashi, who has always had a connection with Naruto, would be likely to support him. He might secretly provide Naruto with some resources or training advice.
Sasuke could be one of the characters to support Naruto. They have a deep bond, and Sasuke might understand Naruto's reasons for wanting to change Konoha. Also, Shikamaru, being a smart strategist, might see the potential in Naruto's plan and choose to support him.
Sasuke could be one of the characters to support Naruto. Given their complex relationship and Sasuke's own issues with Konoha in the past, he might see Naruto's cause as just. Another one could be Jiraiya. If he were alive and found out about the real reasons behind Naruto's revenge, he might side with Naruto as he always cared for him deeply. Also, some of the outcast ninja within Konoha, like those who have been discriminated against because of their bloodline or lack of skills, might support Naruto as they also have grudges against the village system.
Naruto himself is often a main character. His energetic and fearless nature translates well into his dancing. He might be the one leading the crew with his unique style.