Well, it might feature some of the less - known characters from the Naruto series. Maybe some of the younger ninjas from the Leaf Village who are on a training mission and end up lost in the Green Seas. They could be characters that the author of the fanfiction wants to give more spotlight to, rather than the main characters from the original series all the time.
I'm not sure specifically since it's a fanfiction. But it could be Naruto and his friends like Sasuke and Sakura. They often get involved in all sorts of adventures in fan - made stories.
It could be about a character getting lost in some sort of green, perhaps forest - like or oceanic - like areas in the Naruto universe. Maybe it's a story of self - discovery as the character battles the unknown elements of these green seas.
The Hokage, like Kakashi or Tsunade, could also be important characters in this fanfiction. They would have to deal with the political implications of Naruto being a lost prince. Their reactions could range from trying to protect Naruto and use his new status for the good of the village, to being worried about how it will disrupt the existing power structure.
Another character that could be prominent in 'Naruto Green Fire Fanfiction' is Kakashi. He could play the role of a mentor, guiding Naruto and the others in understanding the new and potentially dangerous green fire. His experience and wisdom would be valuable in dealing with this new element in the ninja world.
In addition to Naruto, Kakashi could be a key character. He's Naruto's teacher and mentor. He might be guiding Naruto from afar or actively searching for him. Also, characters like Jiraiya could be involved. Jiraiya has had a big influence on Naruto, and his teachings could be what Naruto is reflecting on while lost.
Naruto is likely to be one of the main characters as he is the protagonist of the Naruto Shippuden series. He would probably be central to any fanfiction set in this universe. Sakura might also be there, as she is one of Naruto's closest friends. And depending on the plot, characters like Minato (Naruto's father) who has a connection to the events in The Lost Tower could be a main character as well.
Since it's a Naruto - related fanfic set in the high seas, Naruto is bound to be a central figure. His determination and powerful jutsu would play a key role. However, other characters from the Naruto world would also be involved. For instance, Rock Lee could be there, showing off his unique taijutsu skills on the ship decks or against enemies in the water. And Hinata might be part of the story too, perhaps using her Byakugan to detect hidden threats in the vast ocean or on uncharted islands.
Sakura could be one of the main characters. Since she has knowledge of herbs and medicine, she might work with Naruto in his garden to find new medicinal plants. They could have some interesting interactions as Naruto focuses on the growth of the plants and Sakura on their properties.
Well, considering the title, there might be a lead shinobi character who is highly skilled and brave. Maybe there are also some supporting characters like a wise old shinobi mentor or a young apprentice. And since it's set on the high seas, there could be some non - shinobi characters as well, such as a ship captain or a mermaid who interacts with the shinobi in different ways.
Merlin is obviously one of the main characters. Arthur is also likely to be a major part as Merlin's relationship with him in Camelot is a big aspect. Then there could be new characters introduced, like Merlin's long - lost family members, perhaps a father or a sister who are also important in the story.
Another common character type is the vampire - hunter. They might be lost in their own way, in a world where the lines between good and evil vampires are blurred. They could start off trying to kill all vampires but then have a change of heart after getting to know some of them better.