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 possible plot could be that Percy is in a fierce battle against a powerful and malicious monster. The monster manages to land a lucky and brutal strike that gouges out Percy's eye. After losing his eye, Percy has to deal with not only the physical pain but also the psychological trauma. He might struggle with self - doubt and fear, but eventually overcomes these feelings and becomes even stronger, learning to fight with his new handicap and relying more on his other senses.
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 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.
Well, perhaps it's set in a post - apocalyptic world. Carl is in a fight with some bad guys, and during the struggle, he loses his eye. The fanfic could focus on his journey to get revenge while also learning to live with his disability.
It could be an old enemy like Kronos. Kronos is extremely powerful and cruel. He might target Percy's eye as a way to weaken him both physically and mentally. By taking away Percy's eye, Kronos hopes to make Percy less effective in battle and to shatter his confidence, which is crucial for leading the demigods against him.
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.
It could be a power - hungry warlord in the story's setting. This warlord might be the one who ordered an attack on Carl's group, leading to Carl losing his eye.