One possible reason could be that he has had some extremely traumatic experiences with certain ninjas. Maybe he witnessed a powerful ninja going on a rampage and killing innocent people, which left a deep scar in his mind, making him fear ninjas in general.
Perhaps he blames ninjas in general for the loss of someone close to him. For example, if a group of rogue ninjas were responsible for the death of a dear friend or family member, it could make him resent the whole ninja concept. He might think that if there were no ninjas, such tragedies wouldn't occur.
Kakashi is often a popular choice in fanfiction. Even though he's not primarily known as a sensor ninja, his Sharingan gives him some sensing abilities, and fanfiction writers like to expand on this aspect. They might create stories where he uses his unique blend of skills to outwit his enemies.
They could be a secret group of ninjas from a far - off land that has a connection to the wizarding world. Maybe they found Harry as a baby and decided to raise him as their own.
Definitely Naruto Uzumaki. Since he becomes the Hokage in the original series, he is often a central figure in fanfiction. His growth from a young, mischievous ninja to a powerful Hokage gives a lot of room for creative storylines in fanfiction. Writers can explore his relationships with other villages' leaders, his family life, and his new jutsu development as a Kage - level ninja.
No. Naruto fanfiction usually involves exciting adventures, battles, and the development of characters. The idea of being afraid of the dark seems a bit out of place. But if someone were to write a fanfic about it, it could be a really creative exploration. For instance, they could write about a young Naruto who discovers a strange jutsu that only works in the dark and he has to overcome his fear to master it. This could be a great way to show his determination and growth as a character.
Yes, there might be. The Naruto fandom is quite large and diverse, so it's likely that there are fanfictions exploring the concept of Naruto being afraid of Kushina. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own.
In some fanfictions, Naruto might be afraid of doctors because of past traumas related to medical treatment. Maybe he had a bad experience during a recovery process, like a painful treatment that left a psychological mark.
Chakra metal can significantly enhance a ninja's power. If a ninja wields a weapon made of chakra metal, it can amplify their chakra output. For instance, a kunai made of chakra metal might be able to carry a more powerful chakra - charged attack than a regular kunai.
One reason could be the fear of losing his friends. Naruto has always been very protective of his comrades. In some fanfictions, he might face a situation where he is on the verge of losing them, like a powerful enemy threatening to kill them all. This would make him afraid as his friends are his most precious things.