One storyline could be Naruto gradually losing his sight over time but hiding it because he doesn't want to worry his friends or seem weak. He could struggle with simple tasks like reading scrolls or finding his way around Konoha without making it obvious.
Another possible storyline is that Naruto was born blind but has been using some kind of special ninja technique or chakra control to create an illusion of sight. When the truth starts to surface, it could cause a stir in the ninja world as people wonder how he's been able to function so well all this time.
One possible plotline could be that Naruto has been hiding his blindness all along to protect his friends. He might have developed special techniques to compensate for his lack of sight, like relying more on his other senses such as smell and hearing. For example, he could use his sense of smell to detect enemies' movements and positions, similar to how he uses it to find Sasuke in the original series. Another idea is that his blindness is a result of some hidden power or curse, and as the story unfolds, he has to find a way to either overcome it or use it to his advantage.
A 'Naruto Secretly Blind' fanfiction could be centered around Naruto's secret being a major plot device. It could be that an enemy discovers his blindness and tries to use it against him. Naruto then has to find new ways to fight and protect the village. His blindness could also be the result of a powerful jutsu gone wrong, or perhaps it was a sacrifice he made for the greater good without anyone knowing.
One possible storyline could be that Ryan Blind is a new neighbor who moves into the area. The main characters initially misjudge him because of his blindness, but as they get to know him, they discover his amazing musical talent. And he then becomes part of their group, and they help him pursue his dreams of becoming a famous musician.
One possible reason could be overusing his special powers like the Rasengan or Sage Mode. These techniques might have some sort of negative impact on his eyes over time. For example, if he doesn't control the chakra flow properly during these powerful moves, it could damage his optic nerves gradually.
One possible storyline could be that Naruto is chosen as a temporary Kazekage due to a threat that requires his unique skills. He then has to deal with internal conflicts within the Sand village while also facing external enemies. Another could be that there is some kind of prophecy that only Naruto can fulfill as Kazekage to save both Konoha and Suna.
One possible storyline could be Naruto as an elf trying to fit into the ninja world while still having his elf heritage. He might face discrimination from some who don't understand his different nature.
In a Naruto and Derieri fanfiction, a possible storyline could be that Derieri is mistaken for an enemy in the Naruto universe. Naruto, being the one to see her potential for good, tries to convince others that she is not a threat. As they try to clear her name, they uncover a conspiracy that threatens both their worlds. This would involve a lot of mystery - solving and action as they race against time to stop the conspiracy.
His relationship with Sasuke would likely become more complex. Sasuke might initially feel pity for Naruto, but then respect him more as he sees Naruto still being strong despite his blindness. He could become more protective of Naruto, which is a big change from their usual competitive relationship. With Sakura, she would probably be more motherly towards Naruto, constantly worried about his well - being and trying to find medical jutsu to cure his blindness.
It could also mean that Naruto's actions, which seem normal on the surface, are actually part of a more complex and insane plan in the context of the fanfiction. For example, his pursuit of becoming Hokage might have a much darker and more insane motivation that he keeps secret.
There are several potential reasons. It could be a result of a psychological experiment gone wrong. Some fanfictions like to play with the idea of Naruto being a test subject, and this could lead to his emotions being numbed. Another aspect could be related to his role as a leader. In some fanfictions, to be a strong and effective leader, he might believe he has to hide his emotions. Additionally, it could be a reaction to the expectations of others. If everyone expects him to be a fearless hero all the time, he might start to suppress his true emotions to meet those expectations.