Some people write it because they might not like Percy's character arc in the original books. They feel that he gets too much praise or that his development isn't as good as it could be.
Some people write it because they simply don't like Molly and Percy. Maybe they think the characters are annoying or they don't fit into their idea of what the story should be like.
People write 'Percy Jackson tortured fanfiction' to explore darker themes. They want to see how the characters would react under extreme pressure. Percy is a strong character in the original series, and by torturing him in fanfiction, writers can show his limits and how he might overcome or succumb to different forms of torture.
Some people write avengers bashing fanfiction just for fun or to be contrarian. They like to see what happens when they turn the well - known heroes into something else. It could be a way to start discussions among fans as well. For instance, if a writer creates a fanfic where Hulk is out of control all the time and causing chaos instead of helping, it can spark debates about the true nature of the character and how he should be written.
People write it because they love the relationship between Annabeth and Percy. Their connection in the original series is so strong that fans want to explore more romantic moments between them, like their kisses.
It's mainly because fans adore Percy and Annabeth as a couple. Writing about their kiss allows fans to add their own spin on the relationship. They can create different scenarios, like a first kiss in a new and unexpected location, or a kiss that saves the day in a unique way. It gives fans a chance to be part of the story's romantic development.
People write 'naruto issei bashing fanfiction' because they are big fans of Naruto and want to see him in a more dominant role. They might not like Issei's character or the way his story is developed in his own series, so they create fanfiction to boost Naruto and put Issei down.
Some people write it because they might not have liked the Cullens in the original Twilight. Maybe they thought the Cullens were too perfect or overpowered. So, they create fanfiction to show a different side of them, one that is more flawed.
Some people might write it for creative freedom. They see the 'Fairy Tail' world as a starting point, but they want to explore different ideas and concepts that go against the original narrative. They might have different views on the power levels of characters, for example, and use the fanfiction to change that. Another aspect could be that they want to start discussions among other fans. By presenting an alternative view in the form of 'fairy tail bashing fanfiction', they hope to engage with others who may have similar or opposing views.
There are several reasons. Firstly, the idea of an underwater kiss is something that isn't common in mainstream literature. So, fans want to create their own versions. Secondly, it can be a way to explore the characters' deeper feelings. In the underwater world, things seem more intense and secluded. For Percy and his love interest, it could be a moment that's just for them, away from the chaos of the above - water world. It gives a chance to show a different side of their relationship and add more depth to the story.
There could be a sense of wanting to rewrite the narrative. Maybe they felt that Snape was over - glorified in the original story, especially considering his past as a Death Eater. They want to explore the idea that his actions, even his good ones like protecting Harry, were not enough to make up for his earlier wrongdoings. So they write fanfiction to challenge the positive view of Snape that some fans have.