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.
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 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 the original series, squibs like Filch are more on the sidelines. But in fanfic, they can be the main focus. Fanfic might give them more agency and explore their unfulfilled magical desires more deeply.
One way it can be different in fanfic is in the control aspect. In the original series, legilimency was a complex and somewhat restricted magic. But in fanfic, a character might have perfect control over their legilimency, being able to turn it on and off at will, or even target specific thoughts within a person's mind with great precision.
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.
His relationships can be changed. In the original, his interactions were somewhat limited. Fanfic authors might give him deeper friendships or romances. For instance, he could have a romantic relationship with a character that was not in his story arc in the original Naruto.
Fuuinjutsu in Naruto fanfic often has different levels of complexity compared to the original. Fanfic writers may introduce new types of seals that have unique properties not seen in the show. For instance, a seal that can transfer a person's soul into another body. Also, the power levels of existing fuuinjutsu might be exaggerated in fanfic to create more intense storylines.
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.
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.