Perhaps in the fanfiction's unique take on his character, Naruto has developed a psychological barrier because of the way people have treated him. He's always been an outcast in some ways, and being touched might make him feel vulnerable and exposed, like people are getting too close to the real him that he's been hiding for so long.
It could also be related to his jinchuriki status. The Nine - Tails' chakra within him might make him feel that being touched could lead to the unleashing of that power accidentally, and he's afraid of harming others or losing control. So, to avoid any such situations, he's scared of being touched.
One possible reason could be that Naruto had a traumatic experience related to thunder when he was young. Maybe he was alone during a thunderstorm and something really scary happened, like seeing a lightning strike too close for comfort. This could have left a lasting mark on his psyche, making him fear thunder in the fanfiction.
In many Naruto fanfictions, Naruto might have developed some new and unique abilities that the Kyuubi has no defense against. This could make the Kyuubi, which is used to being a dominant and feared force, feel vulnerable. For example, if Naruto has the power to nullify the Kyuubi's chakra or to manipulate it in a way that goes against the Kyuubi's will, it would be a cause for fear.
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.
One possible reason could be his past traumas. Naruto grew up alone and was often shunned by the villagers. Physical touch might remind him of the times when he was pushed away or bullied, so he has developed an aversion to it in fanfiction.
It might be shown through his reactions. For example, when someone tries to touch him, he may flinch or move away quickly.
Yes, there are likely to be such fanfictions. In the Naruto series, Sakura can be quite assertive and strong - willed. Her temper and skills could potentially be a source of intimidation for Naruto in the creative interpretations of fanfiction writers.
Maybe it's because Percy in the stories often challenges the traditional Roman beliefs and ways. His actions and abilities might seem threatening to the Romans in the fanfiction world.
Maybe in the fanfiction, Percy has some superpowers or a really strong and unpredictable personality that makes Paul feel intimidated.
In fanfiction, monsters might be scared of Percy because he often has special powers. For example, he could be a powerful demigod with the ability to control water. His skills in combat also make him a formidable opponent. So, the monsters sense the danger he poses and are scared.
Maybe it's because Nico has some complex and often dark or angsty aspects to his character in the source material. Fanfiction might explore these in extreme ways that can be disturbing to some readers.