In a fanfiction scenario, Peter Pettigrew could be caught by a student who is very observant. This student might notice his strange behavior and start to follow him. Eventually, they catch him in the act of doing something really bad, like trying to hex an innocent student to keep his secrets. This could then lead to a big confrontation where the truth about Peter Pettigrew starts to come out, and the other characters have to deal with the fact that there's a traitor in their midst. It could also involve the student who caught him having to convince others that Peter is not as innocent as he seems, which could be a difficult task considering Peter's ability to act meek and harmless.
If Peter Pettigrew was caught, it could have completely changed the course of the story. Maybe Voldemort's plans would have been foiled earlier.
If Peter Pettigrew was caught, it would likely have caused a major upheaval. The power balance in the wizarding world might have shifted, and the Order of the Phoenix could have had an advantage sooner. It's an interesting 'what if' scenario that could have taken the story in many unexpected directions.
One idea could be exploring his childhood before Hogwarts and how wearing diapers was a normal part of that early life. Maybe there were some magical mishaps related to his diaper - like it magically changed colors based on his mood.
Another interesting plot could be a redemption arc for Peter Pettigrew. What if he had a change of heart during the events of the books and tried to make amends? Writers could show how the other characters react to his attempts at redemption, whether they believe him or not. It could also involve him using his skills in a positive way to help defeat Voldemort in the end. This would be a complex and engaging plot as it goes against the typical view of him as a traitor.
If Peter Pettigrew is caught early in fanfiction, it could prevent the death of James and Lily Potter. Since he won't be able to pass on their location to Voldemort. It would also change Sirius Black's fate as he wouldn't be wrongly accused of betraying his friends.
There are fanfictions that explore Peter Pettigrew's early days at Hogwarts. Maybe he was once a more innocent boy who got influenced by the wrong crowd. For example, a story could show how he first met James, Sirius and Remus and how his insecurities led him down the path of eventually becoming a Death Eater.
It could lead to a completely different story arc. Maybe he'd have stronger friendships or face different challenges.
There might be new witches and wizards who have heard of his story. They could be either fascinated or disgusted by his past deeds. He may also run into future versions of Hogwarts professors. They would probably be very different from the ones he knew, with new teaching methods and different personalities.
One common theme is guilt. His feelings of guilt over his actions drive him to seek redemption. Another is forgiveness, whether from his former friends or from the wizarding community.
In fanfiction, Ron Weasley is often depicted as a loyal friend. His character traits like his sense of humor and sometimes clumsy nature are explored in different ways. Peter Pettigrew, on the other hand, is a complex character. Since he was a traitor in the original story, fanfictions might delve into his motives more deeply. Some fanfictions may try to redeem him in a way, while others might show his true evil nature more vividly in new scenarios.