There's also the possibility that it's an accidental injury caused by one of Naruto's friends during a training session gone wrong. For example, Sasuke could accidentally unleash a jutsu that hits Naruto's eye while they are sparring.
One consequence could be that Naruto becomes more isolated. He may feel like he's a burden or that he's not as strong as he used to be. However, this could also lead to him becoming more determined to overcome his disability. He might train harder to develop his other senses, like his hearing and sense of smell, to make up for the loss of his eye. This could ultimately make him a more well - rounded and unpredictable fighter.
Well, it could be due to a powerful enemy attack during a fight in Wave. Maybe an enemy with a sharp weapon or some dangerous jutsu managed to strike Naruto's eye.
It could be a new, mysterious ninja from a far - off land. This ninja might have a vendetta against Naruto for some reason, like Naruto interfering in their plans before. They could be extremely powerful and use some sort of dark jutsu to target Naruto's eye specifically.
Well, one possibility could be that Naruto loses his eye in a battle against a powerful new enemy. This loss could lead to him struggling with his self - confidence and his ninja abilities at first. But then, he might train hard to adapt and develop new skills that rely less on his sight, like enhancing his other senses.
One possible consequence could be a change in his fighting style. Without his eye, he might have to rely more on his other senses like hearing and smell, similar to how blind ninja in the Naruto universe adapt. For example, he could focus more on using his chakra to sense the movements of his opponents.
One possible plot development could be that Naruto loses his eye in a battle against a powerful new enemy. This might lead to him having to adapt his fighting style, perhaps relying more on his other senses like hearing and smell. He could also experience self - doubt and a crisis of confidence, but then use this setback as motivation to become even stronger.
In this fanfiction, it could be that Naruto's left - eye loss is part of a curse placed on him by an ancient evil. This curse not only takes his eye but also starts to drain his chakra. Naruto then has to search for the origin of the curse to break it. Along the way, he meets some new characters who either help or hinder him. His relationship with Sasuke could also be affected as Sasuke might see Naruto as weakened and try to protect him in his own way, which Naruto would initially resist as he doesn't want to be seen as a liability.
It could be a rogue ninja from a hidden village that has a grudge against Naruto. This ninja might have a special jutsu that specifically targets Naruto's left eye during a fight, causing him to lose it.
Often, it starts with the event that causes Naruto to lose his eye. It could be a battle with a powerful enemy or an accident. Then, Naruto has to deal with the immediate aftermath, like the pain and shock.