who is naruto the reincarnation of

Obviously Naruto would be one of the main characters. Since it's about his reincarnation related to Sparda. But there might also be characters from the Naruto series like Sasuke, Kakashi etc. who would be involved in the story. And depending on how the Sparda aspect is incorporated, there could be some new characters related to Sparda's world as well.

Obviously, Naruto would be one of the main characters as he is the one who is the reincarnation of Kisuke. And Kisuke himself, even if only in the context of his past life or the influence he has on Naruto. There might also be other Naruto - related characters like Sasuke, Sakura, etc., as they would interact with Naruto in this new situation of his reincarnation.

Naruto is surely one of the main characters since it's about his reincarnation. And there would likely be his friends like Sasuke and Sakura. Also, characters related to the Sage of Six Paths might play important roles, either as allies or antagonists.

Obviously, Naruto would be the central character as it's about his reincarnation of Juubi. Sasuke would also play a major role. He has always been Naruto's rival and friend, and in this scenario, he would be involved in Naruto's journey with the new power. Kakashi could also be an important character, perhaps guiding Naruto in some way on how to handle this new and dangerous power.

Often, the main oc character can become quite popular. If they have a really interesting backstory, like being a reincarnation of a powerful but misunderstood figure from another world, readers tend to like them. Also, characters who interact well with the original Naruto characters, like befriending Naruto himself or having an interesting rivalry with Sasuke, can gain popularity.

It could be someone who wants to use Naruto's new Buu - like powers for their own evil purposes. Maybe an old enemy who realizes that Naruto in this new form is a huge threat to their plans. For instance, Orochimaru might see this as an opportunity to gain even more power and try to control Naruto - as - Buu.

The main character who is reincarnated is often very interesting. They bring a fresh perspective to the Naruto world. Also, any characters that interact with the reincarnated one in a unique way, like an old - school ninja who is skeptical of this new 'reincarnated' concept.

There's also the possibility that Orochimaru could be the main antagonist again. He might be intrigued by Naruto's new powers and try to experiment on him. Orochimaru is always after power and knowledge, and Naruto's Saiyan powers would be something he'd be very interested in. He could use his snake - like abilities and various jutsus to try and capture Naruto.

Obviously, Naruto and Ichigo would be the main characters. Since it's a reincarnation fanfiction, they would be at the center of the story. But other characters from both universes could also be important. In the Naruto side, Sasuke might play a role as he has a strong connection with Naruto. From the Bleach side, Rukia could be involved as she was the one who turned Ichigo into a Soul Reaper. Their interactions with Naruto and Ichigo in this new reincarnation scenario would add depth to the story.