Sasuke could also be a main character. His relationship with Naruto might change due to Naruto having the power of the Red Dragon Emperor. Maybe he would be jealous at first, but then they could end up working together to face new threats that this power has attracted. Sakura might also be involved, perhaps she tries to help Naruto control the new power or she is worried about the changes in Naruto.
There could be characters from the Red Dragon Emperor's original story world who somehow cross over into the Naruto universe. For example, characters who are related to the Red Dragon Emperor in his own story might come to the Naruto world to either help or oppose Naruto depending on their motives in the original story.
Sasuke could also play a major role. His rivalry with Naruto might take on a new dimension with Naruto having the power of the Black Dragon Emperor. He could either be jealous and try to compete even more fiercely, or he might be intrigued and eventually team up with Naruto in a new way.
Obviously Naruto would be the main character. Since it's about him being the son of the primordial dragon.
Obviously, Naruto is one of the main characters. He is the one who usually gets involved with the dragon emperor concept. Sasuke can also be a prominent character. In some fanfictions, he might be jealous or intrigued by Naruto's new dragon - related powers. Kakashi could also play an important role, perhaps as a mentor trying to guide Naruto in handling his new abilities.
Most likely Naruto would be the main character as he is the Dragon Emperor. But other Naruto - verse characters might also be involved, like Sasuke, Sakura, Kakashi, etc. They could play different roles, such as Naruto's allies or opponents in this new storyline.
Well, Naruto is most likely one of the main characters since it's a Naruto fanfiction. And probably there will be a character related to the black dragon emperor, whether it's the black dragon emperor itself or someone who has a connection to it. There could also be other Naruto characters like Sasuke or Sakura involved, depending on how the author wants to develop the story.
Well, clearly the fox and the dragon are the main characters. The fox might be depicted as a clever and resourceful character, perhaps a bit of an underdog. The dragon, on the other hand, could be presented as a powerful and majestic being, with great strength and magic at its disposal.
It could be Naruto himself. Imagine Naruto obtaining the powers of the Red and White Dragon Emperor. He would be an even more formidable force, using his ninja skills along with the dragon powers to protect the Hidden Leaf Village.
The red dragon itself is likely to be a main character. There might also be a young wizard or sorceress who befriends the dragon. Maybe an old sage who guides the dragon on its journey could be another main character.
Obviously, Naruto would be one of the main characters. He's the protagonist of the Naruto series, so it's very likely he'll play a central role in the fanfic. Sasuke could also be a main character as he often has his own story arcs that intersect with Naruto's. And maybe Sakura too, since she's part of the main trio. There might also be some new characters introduced specifically for this fanfic related to the Dragon Blade, like a mysterious ninja who has a connection to the blade's history.
Akeno Himejima is also a favorite. Her dual - nature, being both sweet and having a darker, more sadistic side in battle, adds depth to her character. In fanfiction, she can have different interactions with the Red Dragon Emperor, from being a close ally to a potential love interest.