In a lot of Harry Potter's arse fanfiction, Dumbledore might make an appearance. He is such an important figure in the wizarding world, and his wisdom could be used to explain or deal with whatever strange situation is going on with Harry's arse. Snape could also be there, perhaps begrudgingly helping Harry when something related to his arse endangers the whole school. And of course, there would be the various Hogwarts students who might be curious or involved in the events surrounding Harry's arse.
Some fanfictions might explore a plot where Harry Potter's arse has a connection to another dimension. Through this connection, strange and wonderful things start to happen. For instance, items from the other dimension start to appear around Harry's arse. It could also be a portal of some sort, and Harry and his friends have to figure out how to close it before dangerous creatures from the other side come through.
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.
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.
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.
Hermione Granger is often a common character. She would likely be at the top of her class in the university setting, continuing her thirst for knowledge. Harry Potter himself might also be there, perhaps as a teaching assistant or a more experienced student helping others. Ron Weasley could be around too, still providing his loyalty and humor. And Luna Lovegood might be involved in some of the more unique and esoteric studies at the university.
Goblins are essential characters in Gringotts - related fanfiction. They are the ones who run the bank and have their own set of rules and personalities. Some fanfictions might introduce new goblin characters with unique traits. And then there are the dark wizards or witches who could be trying to break into Gringotts for their own nefarious purposes, like Bellatrix Lestrange who had an interest in the Lestrange vault.
Well, of course, Harry Potter himself is a common character as the heir in these fanfictions. Hermione is often there too, helping Harry figure out the implications of his new status. Ron may also be present, providing support and some comic relief. Sometimes, characters like Dumbledore play a key role as well, guiding Harry through the revelations about his heritage.
Hermione Granger could be a common character. Given her intelligence and knowledge of the wizarding world laws (she's always reading), she could easily be imagined as a brilliant lawyer. She would use her quick thinking and vast magical knowledge to build strong cases.
Well, Harry Potter himself is obviously a very common character. He's often at the center of the action, using his skills and courage to face whatever the storm - related challenges are. Hermione Granger is also common, as her vast knowledge of magic is usually crucial in solving problems. And of course, Ron Weasley, Harry's loyal friend, is there to provide support and comic relief.
Dumbledore also frequently appears in these fanfictions. He plays a crucial role in Harry's life in the original series, and in baby Harry fanfictions, he might be shown as having a more hands - on approach in protecting and guiding the infant Harry. He could be the one making decisions about Harry's future and safety.