Well, for sure Naruto and Queen Celestia are central. But we could also have other characters from different universes. Maybe some crossover characters like a wizard from another fantasy world who comes to see this strange combination of a ninja being the son of a powerful queen. There could also be some sort of hybrid characters that are created as a result of the mixing of the Naruto universe and Queen Celestia's world. These new characters could be friends or foes to Naruto, adding more complexity to the story.
Obviously Naruto himself and Queen Celestia as his mother. There could also be characters from the Naruto series like Sasuke and Sakura. They might come to the world where Queen Celestia rules to help Naruto or to explore. And from Queen Celestia's side, there could be her loyal subjects, like the ponies if it's related to the My Little Pony world where she is from. They could interact with Naruto in various ways, either being friendly or a bit suspicious of this new 'son' of their queen.
In this fanfiction, we might see Naruto's friends from Konoha. They could be curious about Naruto's newfound heritage. On the Queen Celestia's side, there could be powerful magical beings who act as advisors to her. These characters could play important roles in Naruto's journey. For example, they could teach Naruto about the magic in this new world or test him to see if he's truly worthy of being the son of Queen Celestia. Also, there could be antagonists who oppose Naruto's claim to be Queen Celestia's son and try to undermine him at every turn.
Obviously Naruto would be one of the main characters since it's about him being the son of Celestia. There might also be other characters from the Naruto universe like Sasuke and Sakura who could be involved in the story, perhaps having different reactions to Naruto's new identity.
Obviously, there would be the queen vampire, his mother. She could be a powerful and mysterious figure, perhaps with her own motives and plans for Naruto. There might also be some vampire elders or nobles who play a role in Naruto's life, either guiding him or trying to use him for their own purposes.
The plot might involve Naruto having to prove himself as the son of Queen Celestia. There could be those who doubt his lineage and he has to go on quests or battles to show that he is worthy. He could also learn about his mother's (Queen Celestia) history and the secrets of the land she rules, all while using his ninja skills in a new and magical context.
In this fanfiction, characters like Hagrid could also be involved. He could befriend Naruto and introduce him to the more positive aspects of the wizarding world. And of course, there could be other Death Eaters who might either try to use Naruto or see him as a threat due to his relation to Bellatrix.
Well, Naruto is the key character here. Then we could have other Naruto characters like Jiraiya. In the Olympian part, Hermes could be a character as he could be the one to guide Naruto in the Olympian world. Also, Aphrodite might be there, perhaps using her charm powers to either help or hinder Naruto. And in the Naruto world, we can't forget characters like Gaara who might react in different ways to Naruto's newfound Olympian identity.
One potential character could be Kakashi. He would probably be very confused and concerned about Naruto's situation. He might try to train Naruto to control his powers in a way that doesn't harm himself or others. Another character could be Tsunade. As the Hokage, she would have to decide how to deal with Naruto. She could either support him or try to keep him in check. And of course, there could be some villains from the Deathwing side who come to either recruit or destroy Naruto.
Obviously Naruto would be the main character. Shukaku itself or a representation of Shukaku's spirit could be there. Also, characters like Iruka sensei would still be around. His friends like Sasuke and Sakura would play important roles as they react to Naruto's new situation.
Obviously Naruto himself. Then there could be other Naruto characters like Sasuke and Sakura who would react to Naruto's new heritage. Also, characters related to Mileena might be introduced, perhaps some of her allies or enemies from her own story.
Obviously Naruto as the main character. Gabriel would be a key figure, perhaps appearing in flashbacks or even in a more present form to guide Naruto. There could also be other Naruto characters like Kakashi, who might be intrigued by Naruto's new heritage and try to help him understand and control it.
Obviously Naruto himself. There could also be characters from the Naruto universe like Kakashi, who might be involved in Naruto's discovery of his Sabertooth heritage. And perhaps some original characters related to the Sabertooth aspect could be introduced.