Well, it would have a huge impact on the wizarding world as a whole. The Ministry of Magic would be in an uproar. They had high hopes for Harry and his role in the future of the wizarding community. His death could also lead to a change in the way Hogwarts approaches the Triwizard Tournament in the future. There would be a lot more safety regulations and restrictions. And his death would leave a big emotional void in the hearts of those who knew him, like Hagrid who had a special bond with Harry.
One possible consequence could be chaos at Hogwarts. The school has high hopes for Harry in the Triwizard Tournament. His death would shock the students and teachers. The other champions might feel guilty or be blamed. Also, Voldemort's plans related to Harry would be disrupted, as he was supposed to be a major part in the wizarding world's future battles against the Dark Lord.
If Harry dies in the first task in fanfic, it would completely change the whole story. For one, Hogwarts would lose its hero. The Triwizard Tournament would be thrown into chaos. Cedric might become the sole focus then, but he also would be in shock as Harry was his competitor and also a fellow student. And Voldemort's plans related to Harry would be thwarted, at least for the time being, as he had some long - term designs involving Harry. It would also have a huge impact on Harry's friends, like Ron and Hermione. They would be devastated and might try to find out the real cause of his death.
Harry might face a lot of criticism. The wizarding community might think he's being naive by bringing back Pettigrew. There's also the risk that Pettigrew could double - cross him. After all, Pettigrew has a history of betraying those who trust him. This could put Harry in a very difficult situation, especially if Pettigrew lies about Harry or tries to frame him for something.
One consequence could be that memories are altered. People might forget certain events that happened before the time reset. For example, Voldemort's followers may not remember some of their evil deeds if those events are wiped out by the time reset.
It could also change the power dynamics. Percy had unique powers and abilities that were crucial in the war. Without him, the opposing forces might gain an upper hand. For example, his control over water was a major asset in battles against the giants. His death would mean the loss of that strategic advantage.
He might get confused. Fanfiction often takes the original story in different directions, with different characterizations and plot twists. If Harry reads it, he might start to question the 'true' nature of his own experiences and the people around him.
One consequence could be that he endangers himself. Maybe he disobeys a warning not to enter a certain dark forest in the fanfiction. As a result, he could encounter dangerous magical creatures or dark wizards. Another outcome is that his disobedience might lead to a rift in his relationships. If he doesn't follow the advice of his mentors like Dumbledore in the fan - made story, it can cause tension between them.
One possible consequence is the loss of heat and light. Earth would become extremely cold and dark. All plants would die without sunlight for photosynthesis, leading to the collapse of the food chain. Also, the orbits of planets might be disrupted as the sun's gravitational pull weakens during its dying process.
The playing of memories could also have a negative impact. If the memories are too distracting or if they make him overthink, it could lead to mistakes. For instance, if he gets too caught up in the memories of a champion who failed, it might make him nervous and cause him to make errors during the first task.
One possible reason could be a powerful and unforeseen dark magic spell within the Chamber. Maybe in the fanfiction, the basilisk had some sort of enhanced venom or an additional power that was able to kill Harry despite his usual heroics.