As the plot progresses, Harry might start to realize the true extent of what he's gotten himself into. He could face internal struggles, doubting his decision. Maybe he'll discover some secrets about the Goblet or the tournament that he wasn't supposed to know. This could lead to a whole new set of challenges and adventures, like having to deal with dark magic associated with the tournament that was hidden from the public.
The plot could also take a turn where Harry teams up with unexpected allies. Since he's in this situation on his own, he might find help from characters who were previously on the sidelines. These new alliances could change the power dynamics in the wizarding world and lead to a different outcome in the tournament. It could also involve a lot of character development for Harry as he learns from his mistakes and tries to make the best of a bad situation.
The plot could develop in a way that Harry is transported to a different realm or time period. In fanfiction, the Goblet's summoning power could be more than just for a tournament. He could end up in a place where the magic is different, and he has to adapt quickly. He might meet versions of his friends or enemies that are very different from what he knows, and this would greatly influence the story's development.
In the later part of the plot, there could be a turning point. Maybe Harry realizes that his isolation isn't helping him and that he needs his friends. Or perhaps an external threat arises that forces him to come out of his self - imposed isolation. This could lead to a rekindling of his relationships, and they all work together to face the new challenge stronger than ever before.
In the fanfic, Harry might use his quick thinking and knowledge of magic. He could trick the Goblet by using spells to misdirect its selection process. For example, he might create an illusion of another person's identity so the Goblet chooses based on false information.
Well, it could lead to Harry feeling a bit heartbroken at first. But then he might focus more on his fight against the dark forces. He realizes that their friendship is more important than a romantic relationship that wasn't meant to be.
Well, he might start his own secret training. Away from Hogwarts, he could find a hidden place and train with some unknown but powerful wizards. This new training could give him different skills and powers that Hogwarts couldn't offer.
After Umbridge uses Veritaserum on Harry in a fanfic, the plot could develop in various ways. If Harry reveals secrets about the resistance against Umbridge, she could crush it. On the other hand, his friends might try to rescue him from the situation and that could start a whole new adventure of escaping Umbridge's clutches.
In this fanfic, Harry's character would be a blend of vulnerability and strength. On one hand, he's all alone, which makes him vulnerable. But on the other hand, he has to be strong to survive. This duality could lead to some interesting character arcs. For example, he might struggle with trust issues, especially when he finally meets other wizards. He would have to learn to balance his self - taught independence with the need to rely on others at times. And his experiences of raising himself could also make him more empathetic towards other orphans or those who have been marginalized in the wizarding world.
Another consequence could be that he has to face opponents in the tournament that are far more experienced or dangerous than he expected. In fanfic, the author might make these opponents even more formidable to test Harry in ways that the original tournament didn't. Also, his relationship with Cedric could be severely strained as they are now direct competitors, which could lead to some intense rivalries and emotional drama.
Often, it develops through their interactions during the Triwizard Tournament. As they are both champions, they are thrown into situations together. For example, at the Yule Ball, they might have a conversation that gives Harry new insights into Fleur.
The destruction of the Goblet of Fire could also cause a rift among the characters. Some might blame Harry completely, while others might try to understand his reasons. This could split the group of friends. Hermione, for example, might be torn between her loyalty to Harry and her belief in following the rules. Ron could be more straightforward in his anger towards Harry. And this internal conflict could be a major part of the fanfiction's plot as they all try to deal with the aftermath of the goblet's destruction.