One common theme is redemption. Many fanfictions explore the idea of Peter Pettigrew seeking redemption for his actions. Since he was a traitor to the Potters, some stories show him trying to make up for it, often in relation to Harry.
The theme of secrets and revelations is also popular. Writers often create scenarios where Peter has hidden secrets that Harry discovers. These secrets could change Harry's perception of Peter and the entire wizarding world's history related to the events that Peter was involved in.
Another theme is the exploration of loyalty. In the original story, Peter's loyalty was very fickle. Fanfictions might play with this concept, like showing Peter torn between different loyalties, such as to Harry, Voldemort, or his own self - preservation.
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.
Isolation is also a theme. Since Peter is often an outcast even among the bad guys, fanfics sometimes explore his loneliness. He's not really fully accepted by either side, and this can create some really poignant stories where he's just trying to find his place in a world that has shunned him.
One common theme is redemption. Given Peter Pettigrew's past as a traitor, many fanfictions focus on his journey to redeem himself with Ron often being a key figure in that process. For example, Ron might offer forgiveness or a chance for Peter to start anew.
Well, the theme of second chances is quite prevalent. Peter's time travel allows him to have a second chance at making different choices. This could be related to his loyalty to his friends or his actions in the wizarding wars. Additionally, the theme of time paradoxes is often explored. His actions in the past during time travel could have unforeseen consequences for the future, and fanfictions often play around with this concept. The exploration of the wizarding world's history is also a theme. As he travels through time, the reader gets to see different historical events and how they shaped the wizarding world.
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.
Another theme could be the relationship aspect. Since it's a pairing, the development of their relationship, whether it's a friendship or something more romantic. Writers might focus on how they first meet, the misunderstandings that could occur due to their different backgrounds, and how they gradually grow closer.
A rather unique fanfiction is 'Harry Potter and Peter Pettigrew: An Unlikely Bond'. This one delves deep into how Harry, after learning about Peter's past and his fear - driven actions, decides to give him a chance. It shows how their relationship develops over time, with Peter slowly trying to make amends for his past deeds and Harry trying to understand the man behind the traitor.
Friendship is a very common theme. Since they are from different fictional universes, exploring how they become friends and support each other is popular. For example, they might help each other overcome their respective enemies.
The theme of friendship across different worlds is also prevalent. Harry and Peter, coming from different fictional universes, form a bond in fanfictions. This friendship often becomes a powerful force against any threats they face together, and it also helps them understand each other's cultures and values better.
Another theme is loyalty. They often have to choose between each other and other things in their lives. Sometimes, Harry has to decide whether to side with his family's business or with Peter when there are conflicts.