One possible reason could be that he doesn't want others to pity him. Naruto has always been a proud and strong - willed character. His scars might be a reminder of painful past experiences, and he prefers to deal with them privately rather than showing vulnerability to others.
It could also be that his scars are associated with secrets he doesn't want to reveal. For example, some of his scars might be from battles where he used a new or dangerous technique. Naruto might be afraid that if his enemies find out about these, they could use the knowledge against him or those he cares about.
Maybe he hides his scars because he wants to present a perfect image of himself. In the ninja world, being strong both physically and mentally is highly valued. Scars could be seen as a sign of weakness, and Naruto, who is looked up to by many, might not want to shatter that image.
In the fanfiction, Naruto might use his chakra control skills to create a genjutsu that alters the perception of those who see him. He could project an image of his unscarred self over his actual body. For example, he focuses his chakra on the area around his scars and manipulates the light and the way it reflects off his skin in the eyes of others, making the scars seem to disappear.
He might show his scars to Sasuke. Given their complex relationship, it could be a powerful moment between them, a way to show Sasuke that Naruto has also faced great pain in their separation and the events that followed.
It delves into his deeper insecurities. Naruto might seem confident on the outside, but hiding his scars could mean he's not fully comfortable with himself. This aspect of the fanfiction can explore how he overcomes these insecurities as the story progresses. For instance, as he faces more challenges and interacts with different characters, he might gradually learn to accept his scars as part of his journey and growth.
In the context of fanfiction, it might also be a plot device to explore Naruto's vulnerability. It could lead to new character developments, such as others seeing him in a new light. Maybe it causes some characters to re - evaluate their relationship with him, while for others it could be a source of inspiration, seeing that even someone as strong as Naruto has his own set of hardships.
One possible significance could be a sign of his growth and the battles he has endured. His scars are like a visual record of his journey, showing how he has overcome difficulties. They might also be a way to connect with other characters on a deeper level, as they can see the physical toll his life has taken.
One possible reason could be that his eyes hold a special power that he doesn't want others to discover easily. For example, it might be a new type of Sharingan or a unique ability related to his Uzumaki heritage that he needs to keep secret to protect himself or those around him.
Maybe he wants to surprise his opponents in battles. He could be waiting for the perfect moment to reveal his full power and turn the tables on his enemies.
Perhaps Naruto is tired of the pitying looks he gets from people when they see his scars. By hiding them with genjutsu, he can avoid those uncomfortable moments and be treated as just Naruto, the powerful ninja, rather than Naruto, the one with the scars. Also, he may not want his enemies to see his scars and think they've managed to truly harm him, so he uses genjutsu to keep up a facade of being unscathed.
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.
Some characters might be shocked and saddened. They may have known Naruto as a strong and energetic person, and seeing his scars would make them realize the hardships he has faced.