Odin lost his eye in a quest for profound wisdom. It was a selfless act to gain insights that would aid him in his role as the Allfather. He believed that the sacrifice was necessary for the greater good.
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.
At first, Percy would probably be angry and frustrated. Losing an eye is a huge deal. But he's also a determined person. He would start to practice with his remaining senses more intensively. He'd learn to listen more carefully for approaching enemies, feel the vibrations in the ground or water more acutely. He might also seek out some magical or medical help within the demigod world. There could be potions or spells that might help him either regain some vision or enhance his other senses to make up for the loss.
Well, one possible plot development could be that it makes her more determined. Losing an eye might be a turning point where she decides to train even harder to overcome her disability. Maybe she starts to focus more on her other senses, like Naruto in the original series focused on his sense of smell when his vision was blocked. It could also lead to some interesting interactions with her friends. They might be overly protective at first, but she would prove to them that she's still the same strong - willed person.
Another reason could be related to his personal growth. He might be trying to master the power of the eye in private. Naruto has always been one to face challenges alone at first. By hiding his eye, he can focus on understanding and using its power without distractions or the pressure of others' expectations.
In a fanfiction, Percy could lose an eye while on a quest. Perhaps he's exploring an ancient, cursed temple. There are hidden traps everywhere, and as he's trying to solve a riddle to progress, one of the booby traps activates. A sharp blade swings out and hits his eye. This event could change his relationships. Some friends might be overly protective, while others might not know how to act around him. Percy would then have to prove that he's still the same hero, just with a new challenge to overcome.
One possible plotline could be Ruby's struggle with self - image. Losing an eye would be a huge change for her. She might have to adapt to new ways of fighting and seeing the world. Another plotline could involve her relationships. Her friends would likely be very concerned and protective, which could lead to some interesting character dynamics.
Zoro often puts himself between Luffy and danger. For example, when facing strong opponents, he'll be the first to step forward and engage, making sure Luffy is safe behind him.
One consequence could be that his friends might start to suspect him. Since Naruto is usually an open book, hiding something as significant as his eye could make them wonder what he's up to.