One possible reason could be that they are too involved in their own shinobi duties. The world of ninjas is full of dangerous missions, and they might be constantly away on important tasks, leaving Naruto feeling neglected.
One possible story could be that Naruto discovers his unique bloodline abilities later in life and realizes that his parents' neglect was partly due to fearing his power. He then has to come to terms with this and learn to control his abilities on his own.
Naruto might try to seek attention elsewhere. He could focus on his training more intently. By pouring his energy into becoming stronger, he distracts himself from the pain of parental neglect. Also, his friends could play a crucial role. Their friendship might give him the sense of family and belonging that he lacks at home.
In fanfiction, Naruto having the Rinnegan and being neglected by parents can lead to some really interesting character development. It could make him more self - reliant and distrustful at first. He might have to learn to harness the power of the Rinnegan on his own, without any parental guidance. This could result in him making some mistakes along the way but also growing stronger in unique ways.
In this type of fanfiction, Naruto could have a different attitude towards authority. As his parents are neglecting him, he might not have that natural respect for figures of power. He may question the village's system more. Also, his dreams of becoming Hokage could take on a new meaning. Instead of just seeking recognition, it could be a way for him to create a family - a village where no one is neglected like he was by his parents.
Dark Naruto may seek solace in nature. He could go to remote places in the forest and find peace there. Over time, he might start to understand that his parents' neglect doesn't define him. He could then use his experiences to help other neglected or outcast individuals, turning his pain into a positive force for change.
The neglect from his parents in the fanfiction would deeply impact Naruto. He would probably be constantly seeking validation. This could drive him to work even harder to prove himself. His sense of self - worth would be very low initially. For example, he might be overly eager to please others in the village. However, as the story progresses, his experiences could lead to a newfound confidence and a more independent identity.
A plot for this type of fanfic could revolve around Naruto's inner turmoil. He could be constantly haunted by the question of why his parents neglected him. This could lead him to make some bad decisions, like getting involved with the wrong people. However, through a series of events, he starts to realize that he can create his own family and support system. He then begins to build a new life for himself, one that is not defined by his parents' neglect but by his own strength and the relationships he chooses to cultivate.
His emotional side would be deeply affected. He might be more guarded and less likely to show his true feelings easily. He would see the world in a more cynical way at first. But as he grows, he could use his experiences to become more empathetic towards others who are also alone or neglected. For instance, he could start reaching out to orphaned kids in the village. His journey to becoming Hokage would also be different. Instead of having the typical family - inspired motivation, it could be a way to rewrite the story of neglect in his own life and in the village.
One possible scenario in such a fanfiction could be that Naruto's parents are preoccupied with their shinobi duties. They might be constantly on missions for the Hidden Leaf Village, leaving Naruto at home with caretakers who don't really pay him much attention. This could lead to Naruto feeling lonely and isolated, just as he did in the original story when he thought he had no family.