Another reason could be related to Harry's own personal choice or mental state. He might have had some sort of premonition or fear about the tournament. He has already faced a lot of danger in his young life, and the idea of the Triwizard Tournament, with all its unknown and potentially deadly tasks, could have made him decide not to compete. He might also be dealing with other personal issues, like problems in his relationships with friends or teachers that distracted him from wanting to take part.
Well, other characters would get more spotlight. For instance, Cedric Diggory might have a very different experience in the tournament without Harry as a sort of 'rival' in the background. He could face different challenges and make different choices, which would change the whole dynamic of the tasks.
Maybe he has his own personal reasons. He could be afraid of failure, or perhaps he doesn't like the competitive environment. Another possibility is that he has some moral objections to the nature of the competition in the fanfic.
Well, in Harry Potter fanfic, the Triwizard Champions could be a whole mix of different characters. Sometimes, authors might create alternate versions of the original champions. For example, they could make a character who was overlooked in the original story become a champion. It could also include characters from different magical schools that are not part of the canon Triwizard Tournament, like a school from a far - off land. Or perhaps a character who has some special power or ability that makes them stand out as a champion in the fan - created story.
There might be a fanfic where during the Triwizard Tournament, Harry gets cursed and Hermione has to find a way to break the curse. She races against time, using every spell and potion she knows. Meanwhile, she also has to deal with the tournament tasks on Harry's behalf. In the end, through her determination and love for Harry, she manages to break the curse and they both complete the tournament in an unexpected way.
It could be that there are some underlying reasons within the plot of the fanfic. For example, Harry might have some sort of trauma or moral stance that prevents him from competing. Or perhaps he's more focused on other aspects of his life, like exploring magic in a non - competitive way, or building relationships. So he simply chooses not to compete.
One consequence could be that he loses out on potential rewards or recognition. Maybe he was expected to win, and his refusal disappoints his supporters. Another consequence might be that it changes the dynamics of the story, as other characters may have to step up or the competition may be less interesting without him.
Maybe in fanfiction, Harry hates the Triwizard Tournament because it brings too much danger and unwanted attention. He has to face powerful opponents and deal with complex rules that he may not be fully prepared for.
One common theme could be friendship. How Harry and Susan form a bond during the Triwizard Tournament. Another might be mystery, as the Triwizard Tournament has many secrets and challenges.