Naruto's character could develop a new sense of self - awareness. With four eyes, he might feel different from others and this could lead to some self - discovery. He could become more introspective about his role in the village and the ninja world.
Naruto's relationships with his friends could be affected in different ways. Some might be curious and supportive, like Shikamaru who could help him strategize how to use his new eyes best. However, others might be a bit jealous or afraid. Naruto would have to work through these relationship changes, learning to be more empathetic and patient. This would be a significant part of his character development as he navigates this new aspect of himself in the fanfiction.