One possible plot could be that they have a major disagreement over a Quidditch match. Maybe Ron blames Harry for losing the match because Harry made a risky move that didn't pay off. This causes a rift between them, and they start to see each other as rivals rather than friends. They compete in everything from academics to getting the attention of a certain teacher.
The Weasley twins would likely make light of the situation at first. They might crack some jokes to ease the tension. But they would also use their own experiences to tell Harry and Ron that fighting over small things isn't worth it and that they should patch things up quickly.
It could be Draco Malfoy. Since Harry and Ron are not friends, Draco could take advantage of their weakened state. He might try to turn them against each other even more, perhaps by spreading false information about one to the other. He could also try to isolate Harry from the Gryffindor group since Ron is no longer on his side, making Harry an easier target for his bullying.
Well, one way fanfiction might handle Draco, Harry, Ron and Hermione as friends is by exploring their different personalities coming together. Harry's bravery, Ron's loyalty, Hermione's intelligence and Draco's cunning could combine in unexpected ways. They could start off as enemies but as the story unfolds, they realize they have more in common than they thought, like a shared love for Hogwarts and a desire to protect it.
One possible reason could be a divergence in their goals. Maybe in the fanfiction, Harry has a different approach to fighting Voldemort and Ron doesn't agree with it, leading to a rift. For example, Harry might want to take a more aggressive and risky approach while Ron prefers a more cautious one. This difference in ideology can drive them apart.
Ron's best friend is Harry Potter. They met on the Hogwarts Express when they were just starting at Hogwarts. They have been through countless adventures together, facing Voldemort and other dark forces side by side.
It could lead to different alliances. Harry might form new friendships or partnerships that he wouldn't have in the original story. This could change the power dynamics in the wizarding world. For example, he might team up more with Hermione alone, and their relationship could develop in a different way, perhaps more romantically earlier since they don't have Ron as a buffer.
One possible reason could be a misunderstanding. Maybe a miscommunication led to a rift between them. For example, if Harry overheard Ron saying something that was taken out of context, it could start the breakdown of their friendship.
Well, it changes a lot. For one thing, the whole dynamic of Hogwarts would be different. Harry would be more alone without Ron by his side. He would have to find new allies and support systems, which would mean new friendships would form that were not in the original story.
In some Harry Potter fanfiction, Ron's muscles might be emphasized in various ways. For example, in a story where the trio has to face a physical challenge, Ron could suddenly show off his unexpected strength due to his well - developed muscles. Maybe he has been secretly training during their time at Hogwarts, and this newfound strength helps them get out of a tight situation.