Well, Naruto is the main character by default in 'naruto son of joker fanfiction'. However, other main characters could be the Hokage at that time. The Hokage would be in a difficult position as Naruto is now related to a very different kind of character. Additionally, new characters created specifically for this fanfiction could be main characters. They could be hybrids of Naruto's world and the Joker's world, with unique abilities and personalities that drive the story forward.
Obviously Naruto would be one of the main characters. And since it's about him being the son of Arachne, Arachne herself could be a significant character, either in flashbacks or as some kind of guiding force in Naruto's life. His friends like Sasuke and Sakura would also likely be main characters as they interact with Naruto and are affected by his newfound identity.
Obviously Naruto and Sasori. Naruto as the'son' would be the central figure in terms of the story's development. And Sasori, as his 'father' in this fanfiction, would play a crucial role in shaping Naruto's growth.
Naruto is the central figure for sure. But we can't forget about the villains in the Naruto universe. Orochimaru might be interested in Naruto's new powers if he is the son of Jashin. He could try to either steal his powers or use Naruto as a tool. And then there are the Akatsuki members. They might see Naruto as a new threat or an opportunity, depending on how his powers as Jashin's son manifest.
Gohan himself could be a main character in some form. Maybe he exists in Naruto's memories or as a spirit guide. Another potential main character could be Sakura. She might be interested in Naruto's new powers and try to help him understand and control them. And of course, there could be new characters introduced from Gohan's world that interact with the Naruto characters.
Obviously, Naruto would be one of the main characters. And since it's about him being the son of Ameyuri Ringo, she would also be a very important character. Other characters from the Naruto universe like Sasuke, Sakura, and Kakashi could also be main characters as they interact with Naruto in this new context.
Naruto is the central character as the story is about him being the son of the Third Kazekage. Temari and Kankuro from the Sand Village could also be main characters. They may have memories or stories about the Kazekage that could help Naruto. And of course, Kakashi, Naruto's teacher, would play a role. He would be there to guide Naruto through this new discovery and protect him from any threats that come with this new identity.
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.