In fanfiction, sometimes Harry Potter's heroism is shown through different relationships. Maybe he has a closer bond with some characters that were not as emphasized in the original books, and this relationship drives his heroic actions in a new way. Also, the challenges he faces could be more complex or unique compared to the ones in the original story. In the original books, the main threat was Voldemort, but in fanfiction, he could be dealing with all kinds of new dark forces or complex moral dilemmas that further define his heroism.
In the original books, goblins are mainly shown in relation to Gringotts Bank. But in fanfiction, they can have more diverse roles. They might be shown as having their own political agendas outside of the bank operations.
In fanfiction, Dobby is often given more agency. In the original books, he is very much a servant - like figure at first. But in fanfictions, he can be a leader in the fight against the dark forces. For example, he might lead a group of house - elves in a rebellion against the Death Eaters who are cruel to them.
In some fanfictions, a Patronus might be more powerful than in the original books. For example, it could have additional abilities like being able to communicate complex thoughts instead of just being a defensive charm. Fanfic authors often like to expand on the magic system.
In some fanfictions, Harry Potter's magical abilities might be enhanced. For example, he could have the power to control elements in a more advanced way compared to the books. Maybe he can create huge storms or manipulate fire to a greater extent. This gives the author more creative freedom to explore different storylines and scenarios.
The power of augureys is often enhanced in fanfic. While in the books, their significance was somewhat limited. In fanfic, they might have the ability to heal with their feathers, or their song could have the power to put dark creatures to sleep. This expansion of their abilities makes them more interesting and central to the plot in many fan - created stories.
In the original books, Thestrals were not as prominently featured. But in fanfic, they can be the main focus. For instance, in some fanfic, Thestrals are shown to be more intelligent and able to communicate in ways not shown in the books.
His character arc can be very different. In the books, his development was somewhat limited, but in fanfiction, he could have a complete transformation. He might start to oppose the dark side more actively and become a hero - like figure, which is a big contrast to his original role.
In some fanfiction, inquistors are shown as more corrupt than in the original books. They might take bribes or abuse their power for personal gain. For instance, an inquistor could let a known dark wizard go free in exchange for a valuable magical artifact.
In some fanfics, Harry might be more open - minded towards Luna's eccentricities compared to in the books. He could be shown to fully embrace her ideas right away instead of gradually coming to respect them. Luna, on the other hand, might be made even more confident in her beliefs and actions. For example, she could be more assertive in standing up for her views on magical creatures, like the Crumple - Horned Snorkacks.
They could be portrayed as having a bit of good in them. For example, they might be under some sort of dark spell that forces them to act as they do, and if that spell is broken, they could be more like guardians of the wizarding world in a different way.