Hermione often appears in 'Harry Potter New Mother Fanfiction'. She might be the one who first notices the new mother figure's influence on Harry. Ron could also be there, being Harry's best friend and reacting to the changes this new mother brings. And of course, Harry himself is central as the one affected by the new mother.
Often, there are original characters created by the fanfiction authors. For example, a powerful new wizard or witch who helps Harry on his journey with the Deathly Hallows. Maybe a mysterious seer who can predict things about the Hallows that even Dumbledore didn't know. Another common type of new character is a reformed Death Eater who turns against Voldemort when they see Harry using the Deathly Hallows in a way that makes them question their loyalty.
Another theme is the untold story. Since we don't know much about Lily's life before Harry in the original books, fanfictions often fill in those gaps. They might explore her friendships at Hogwarts, her relationship with James Potter in more detail, and how she became the strong woman who was willing to die for her son.
One common theme is the idea of redemption. For example, if Harry's mother was alive, how she could redeem some of the bad characters or situations in the story. Another theme is protection. Mothers are often seen as protectors, so in these fanfictions, Harry's mother might be shown using powerful magic to keep Harry safe.
Harry Potter himself is often a central character. He might be exploring the vaults in search of something that could help him defeat Voldemort once and for all, like a powerful weapon or a spellbook.
Neville Longbottom is a common character in 'Harry Potter inheritance fanfiction'. Given his family's important place in the wizarding world and their losses, he could inherit something significant, like a powerful magical plant - related ability that was once held by his family. Draco Malfoy is another one. He might inherit some dark family secrets or a powerful magical object from the Malfoy family vaults, which could lead to all sorts of interesting storylines as he grapples with his family's legacy.
In 'Harry Potter Rebel Fanfiction', characters like Sirius Black can be important. He was a rebel in the original story, and fanfiction can explore more of his rebellious nature. Severus Snape could also be a character in such stories, especially if the fanfiction delves into his complex relationship with the Death Eaters and his own form of rebellion against Voldemort. And don't forget about Dumbledore. There could be fanfictions that explore his more secretive and perhaps rebellious actions behind the scenes that we didn't fully see in the original series.
Often, Hagrid shows up. Since he has a great love for magical creatures, he could be involved in some sort of magical farming with them. Maybe he's trying to breed a new type of magical beast that can help with plowing the fields or something like that.
Obviously, Harry Potter himself is a common character. He is the main protagonist in the original series and often the central figure in fanfictions related to the broomstick as well. Hermione Granger and Ron Weasley also frequently appear, as they are Harry's closest friends and are usually involved in his adventures.
Of course, there are often original characters in Harry Potter trains fanfiction. These could be new students who have their own secrets or powers. They might interact with the well - known characters, and sometimes they can even be the key to solving a mystery on the train, like uncovering a plot against Hogwarts that starts on the Hogwarts Express.
Harry Potter himself is often a common character. He could be at the camp as a mentor or a special guest. Hermione Granger might also be there, sharing her vast knowledge of magic with the campers. Ron Weasley could be around too, getting into some comical situations. Additionally, new characters created specifically for the fanfiction might be present, like a young wizard who is a bit of a troublemaker at the camp.