One possible reason could be some past trauma. Maybe he had a bad experience during a battle or an encounter that made him associate touch with danger. For example, if he was once grabbed forcefully by an enemy during a fight and it led to a near - death experience, that could make him scared of touch.
It could also be related to his upbringing. Naruto grew up alone for a large part of his life. He might not be used to physical contact in a positive way. So, when someone tries to touch him, it makes him feel uncomfortable and scared as it's something he's not familiar with.
One possible reason could be his past traumas. He grew up lonely and was often shunned by the villagers. This lack of positive human contact in his early years might have made him wary of touch in fanfiction. For example, the constant glares and cold shoulders from the villagers could have made him unaccustomed to friendly or affectionate touches, leading to fear.
The author could start by introducing a character who gradually earns Naruto's trust. This character could start with small, non - threatening touches like a gentle pat on the shoulder. Over time, as Naruto gets more comfortable, the touches could become more affectionate.
One reason could be due to some past trauma. Maybe he endured a lot of physical pain during his battles or training, which made his body overly sensitive. For example, if he was seriously injured in a fight with a powerful enemy, the after - effects might include this touch sensitivity.
Maybe it's the high expectations that Naruto has for Boruto. Naruto is a hero, and he might unknowingly put a lot of pressure on Boruto to follow in his footsteps. Boruto could be scared of not being able to meet those expectations.
One possible reason could be his past traumas. Harry has faced many dangerous and life - threatening situations. For example, the numerous attacks from Voldemort and his Death Eaters. These experiences might have made him overly cautious and averse to physical touch as it could potentially be from an enemy. Also, his upbringing in the Dursley's household wasn't exactly warm and fuzzy. The lack of positive physical contact there could have contributed to this fear.
One possible reason could be that Kushina has a very strong and intimidating personality. In the Naruto universe, she was known to be a tough kunoichi. Naruto, who might be used to more gentle or reserved people around him, could be scared of her boldness.
One possible reason could be that his sister has some special or unknown powers that Naruto doesn't understand. For example, if she has a very unpredictable and potentially dangerous kekkei genkai. Another reason might be that she has a very strong and intimidating personality, which makes Naruto feel small and scared in her presence.
One possible reason could be that Naruto has heard some spooky stories about Kushina from the past. Maybe there are tales in the village that at night, Kushina had a more intimidating presence due to her strong personality and powerful chakra. Another reason might be that Naruto has some sort of premonition or nightmare related to Kushina at night, perhaps linked to some hidden family secrets or events that he is unconsciously aware of.
It can create misunderstandings. For instance, his friends might think he doesn't like them if he recoils from their touches. His romantic relationships could also be affected. If he's in love with someone in the fanfiction, his fear of touch would make it difficult for him to show physical affection, which is an important part of a romantic relationship.
One possible reason could be Kakashi's reputation as a strict and powerful teacher. Naruto might be in awe of his skills and fear making mistakes in front of him.