Naruto is the central figure, of course. But don't forget about characters like Jiraiya. Jiraiya could have some special training or knowledge that he imparts to Naruto to help him deal with his blindness. And then there are the villagers. Their reaction to Naruto's blindness can also be a significant part of the story, so in a way, they can be considered as important characters in this fanfiction.
Obviously Naruto is one of the main characters as the title 'naruto goes blind fanfiction' implies. His friends like Sasuke and Sakura are also likely to be main characters. They play important roles in Naruto's life, especially when he's dealing with his blindness. They could be his support system or even be part of the conflict in some cases.
The main character is Naruto, of course. In addition, there may be a female character who is a skilled horse rider and a good shot. She could initially be skeptical of Naruto but later become his ally. And there might be an old wise man in the Western town who helps Naruto understand the ways of the West and gives him advice on how to use his skills in this new environment.
It really depends on the specific fanfiction. However, it could be the blind samurai themselves as a main character. They would be the focus of the story, with their journey and development being central. There might also be Naruto characters who interact with the blind samurai, like Naruto himself. Naruto's positive and determined attitude could contrast with the more reserved and perhaps wiser blind samurai.
Kakashi is likely to be a main character too. As Naruto's former teacher, he could be guiding Naruto in the ANBU or having some sort of conflict with the ANBU higher - ups over Naruto's training and assignments.
The main character is Naruto for sure. But other characters like Jiraiya might play a significant role. Jiraiya could be the one to guide Naruto in controlling the four - tails' power. Also, characters from the Akatsuki might be main antagonists. They would be interested in Naruto's new power and try to capture or use him for their own purposes, like Pain or Itachi.
Given the title, Naruto is definitely one of the main characters. But it's possible that new characters will be introduced in the western area he goes to. Maybe there will be a local guide or a powerful adversary in that region.
Another main character could be Kakashi. As Naruto's teacher, he could play a crucial role in training Naruto to adapt to his blindness. He might use his own experiences and wisdom to help Naruto develop new skills and strategies for survival and combat in the ninja world.
Maybe there are new characters created specifically for this fanfiction. They could be local inhabitants of the wet area, such as a water nymph - like character who has knowledge about the secrets of the place and either helps or hinders Naruto's journey.
Well, obviously the blind prodigy themselves is a key character. There could also be original characters created specifically for the fanfiction. For example, a rival who also has some sort of disability but uses it in a different way. Another potential character could be a healer who helps the blind prodigy learn to use their other senses better. And of course, existing Naruto characters like Naruto, Sasuke, Sakura, and Kakashi are likely to make appearances. They could interact with the blind prodigy in various ways, like Naruto being a source of motivation or Sasuke being a foil to the blind prodigy's more positive attitude.
Obviously Naruto would be one of the main characters. And from the Nova Corps, likely some of their leaders or important members like Rhomann Dey.
Naruto would obviously be one of the main characters. And for the Hogwarts side, it could be Harry Potter himself. Imagine Naruto and Harry having a unique connection that develops into a yaoi relationship. They both have a sense of justice and a willingness to fight for what's right, which could be the basis for their relationship.