Well, obviously Naruto and Korra are going to be main characters. They are the ones named in the title. Naruto with his ninja skills and Korra with her bending abilities.
Another possibility is that there could be some original characters created specifically for this fanfiction. These new characters could be related to the 'godlike' concept, like some sort of deity or a being with extraordinary powers that affects the story and the interactions between Naruto and Korra.
Obviously Naruto himself would be one of the main characters. Since it's a 'godlike prototype' of him, he would be at the center of the story. Sasuke might also be a main character as his relationship with Naruto is so important in the original Naruto series. They could have new interactions based on Naruto's new godlike abilities.
Naruto is definitely a main character. His presence and his god - like abilities are what make this fanfiction unique. Then, there could be characters like Rias Gremory. She's an important figure in the DxD world, and her relationship with Naruto could range from being an ally to a potential love interest. Also, characters like Akeno Himejima could be involved. She might be curious about Naruto's powers and his different way of doing things compared to the DxD characters.
Naruto would likely still be one of the main characters, but with a much darker and more powerful version of himself. Sasuke could also be a main character, perhaps with his own brand of godlike power that rivals Naruto's. And there might be new, original characters created specifically for this fanfiction that have some connection to these dark godlike powers.
Naruto is most likely to be a main character. He could have a new look, like wearing a pirate hat and a combination of ninja and pirate clothing. Sakura might be another main character, using her medical ninjutsu skills to heal the crew on their pirate ship. There could also be a pirate captain character who befriends Naruto and they embark on adventures together, exploring uncharted islands and facing off against other pirate crews.
There could be new characters created specifically for this fanfiction. Maybe a fellow prisoner who has some special knowledge or ability that helps Naruto during his imprisonment. Or a mysterious figure who is behind Naruto's false imprisonment, pulling the strings from the shadows.
Obviously Naruto would be one of the main characters since it's in the title. And probably some of his friends from the Naruto series like Sasuke or Sakura. Since it's combined with DBZ, there might also be characters from DBZ like Goku or Vegeta. They could either be allies or rivals to the godlike Naruto.
In a 'naruto saves korra fanfiction', the villains could be a combination of different forces. There might be rogue benders who have turned to the dark side, using their bending abilities for evil purposes. These benders could be working with some mysterious outsiders who bring in new and unknown threats. Maybe there are ancient evils that have been awakened and they see Korra as a major obstacle. Naruto would then have to face these complex and dangerous foes to save Korra.
Obviously Naruto would be one of the main characters. He would bring his unique skills and personality into the Claymore world. Then, there would likely be some of the well - known Claymore characters like Clare. She has her own complex backstory and strong will, which would make for an interesting interaction with Naruto.
Obviously, Naruto and Deadpool would be the main characters. Naruto is the one being trained and evolving into a 'godlike' state. Deadpool is the trainer who brings his own set of skills and personality to the story.
Naruto and Ruby are very likely to interact. Ruby is the main character in RWBY, and Naruto being the central figure in his own story, their paths would surely cross. Ruby's enthusiasm for combat and her leadership qualities could make for an interesting dynamic with Naruto's determination and his own brand of leadership. Also, Weiss could interact with Naruto. Given Weiss's strict upbringing and her proficiency in combat, her reaction to Naruto's unorthodox ninja techniques would be fascinating.