Obviously Naruto himself. There could also be the other Naruto characters like Sasuke, Sakura, and Kakashi. And perhaps some Egyptian god - like characters related to Anubis, like his servants or other gods who interact with Naruto due to his relation to Anubis.
Obviously Naruto as the main character. Sasuke could be there, and his relationship with Naruto might change due to Naruto's new identity. There could also be characters from the underworld, like minions of Hades or other mythological creatures.
Obviously Naruto himself. Then there could be Athena, who might appear in some form, either as a guiding spirit or in flashbacks. His friends like Sasuke and Sakura would also be there. Maybe some Greek mythological characters like Hermes could show up to interact with Naruto, since he is now related to their world.
Obviously, Naruto would be one of the main characters. Since he is the son of Khal Drogo in this fanfic, he would be central to the story. Another potential main character could be Sasuke. His relationship with Naruto could be even more complex now, as Naruto has this new and strange heritage. And maybe one of Khal Drogo's most trusted warriors could also be a main character, coming to the Naruto world to help Naruto understand his father's side of the family and teach him things about his newfound heritage.
It could be about Naruto having powers related to Anubis. Maybe he can control the dead or has enhanced speed and strength like the god Anubis is often associated with in Egyptian mythology.
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.