Well, Naruto might start to have some self - discovery moments. Maybe he has a dream or a vision that makes him question his lack of emotional awareness. He could also start to keep a journal to try and figure out his feelings. As he goes on missions, he might observe how his comrades handle their emotions and learn from them. Additionally, he could become more empathetic as he tries to understand his own emotions, which would be an interesting turn in his character development.
He could become more idealistic. Since he doesn't understand hatred, he might strive to create a world where everyone gets along without any grudges. This would make him a very different kind of hero compared to the Naruto in the original series.
His relationships would be in turmoil. Naruto not being aware of his emotions is like sailing a ship without a compass. In his relationships, especially with those close to him, he'd be lost. He might do things that seem out of character because he's not in touch with his feelings. For instance, when it comes to his sensei, he may not be able to show the proper respect or gratitude because he doesn't understand the emotions behind those concepts. His friends would constantly be trying to figure out what's wrong with him, and he'd be equally confused, leading to a lot of strife in his relationships.
Hinata could become more assertive. Since Naruto is creating the fanfiction, he might give her the confidence to speak up more often and take charge in situations. For example, she could lead battles or make important decisions for the village.
Naruto could also develop a more empathetic side towards his enemies. If he discovers through his mother's story that she had her own struggles and how she overcame them with love and understanding, Naruto might try to use the same approach towards his foes. Instead of just fighting them, he could try to understand their motives and find peaceful solutions to conflicts.
A possible plotline could be that Naruto is sent on a mission where he has to deal with a group of people who communicate solely through emotions. Since he doesn't understand emotions well, he struggles to complete the mission. Another one is that he tries to form a closer bond with Sasuke, but his lack of emotional understanding keeps creating misunderstandings between them.
Anko might develop a softer side through her interactions with Naruto. She has a tough exterior due to her past, but Naruto's unwavering optimism and kindness could start to break down her walls. She could become more open and trusting towards others in general.
For Naruto, he could develop more understanding of the darker side of the ninja world through his interactions with Tayuya. Tayuya, on the other hand, might start to see the value of friendship and loyalty like Naruto has. For example, Naruto's unwavering belief in his friends could rub off on Tayuya, making her question her previous solitary and somewhat ruthless ways.
One possible plot development could be that Naruto goes on a journey to try and understand love. He meets different people along the way who teach him about different aspects of love, like an old sage who tells him about self - love and how it's the foundation for understanding other kinds of love. Another could be that his friends try to set him up on dates to help him figure it out, but it just leads to a series of comical misunderstandings.
One possible consequence is that he might become more powerful. With his dark emotions out of the way, he could focus better on his training and unlock new abilities. Another consequence could be that he becomes more isolated. Since his dark emotions were a part of what made him relatable to others, without them, he might seem distant.
Kushina, on the other hand, might experience a loss of agency which could lead to her character growing in different ways. She could fight against Naruto's control, which would show her strong - willed nature. Or she could come to accept it and use it as an opportunity to guide Naruto in a different way. There could be a role reversal of sorts where she becomes the voice of reason in Naruto's head. And this could lead to a very different kind of relationship between them compared to what we know from the original story.