Sometimes, it's just a way to shock the audience. Fanfiction authors often like to take risks and do unexpected things to their beloved characters. Torturing Natsu can be a very unexpected and extreme move that can leave a lasting impression on the readers, whether they like it or not.
Set limits on the description. Avoid going into extreme detail about the torture methods and the pain. Instead, give a general idea of what is happening and quickly shift the focus to how Natsu is going to get out of this situation or how his friends are going to rescue him. This can keep the story moving forward and not dwell too much on the disturbing part.
Appropriateness is subjective to some extent. While some people might be interested in exploring the darker sides of a character like in 't challa gets tortured fanfiction', others may find it offensive or disturbing. If the fanfiction contains excessive violence and torture without any redeeming narrative or moral exploration, it's likely not appropriate.
I'm not sure specifically as there could be many different interpretations of such a fanfiction. It might involve a character named Neal facing some form of extreme distress or harm within the context of a fictional story created by fans.
It's not extremely common, but it does exist. Some fans are interested in exploring how Naruto would react under extreme duress. However, many other types of fanfiction, like Naruto's training arcs or his romantic relationships, are more prevalent. But still, for those who like a more edgy and intense story, 'naruto gets tortured fanfiction' can be appealing.
He could marry an original character created specifically for the fanfiction. This character could be a powerful mage from a far - off place who crosses paths with Natsu during one of his adventures.
One of the senior and more experienced members of the guild. They have seen a lot and know how things should be done in the guild. If Natsu acts in a way that goes against their long - established ways, they would not hesitate to berate him.
No. Fanfiction is meant to be a celebration of the source material and its characters. Torturing a character in a fanfiction is not in line with this purpose. It can create a negative and uncomfortable reading experience. There are so many other positive and interesting aspects of the characters and the story world that can be explored in fanfiction rather than focusing on torture.
It could be Gray. Although they are friends most of the time, in a fanfiction, there could be a plot twist where Gray's envy of Natsu's abilities gets the better of him, and he betrays Natsu. Maybe Gray thinks that by getting rid of Natsu, he can be the top mage in their guild.