Often, they change the original story by giving Harry a fresh start. For example, if in the original he lost someone important, in the fanfic with his regeneration, he might get a chance to save that person. His relationships can also be different. Maybe he becomes closer to some characters he was only acquaintances with before.
They also change the relationships. His friends may treat him differently. Instead of being equals, they become more like protectors. And his enemies might underestimate him, thinking he's just a harmless child. This can lead to situations where Harry uses their false assumptions to his advantage, which is a big change from the original story. Also, the way the adults in the wizarding world interact with him changes. They may be more lenient or overly cautious, which alters the overall feel of the story.
Often, the silver eyes give Harry some sort of special ability. For example, he might be able to see through certain spells or illusions more easily. This can change how he navigates through dangerous situations, like in the Forbidden Forest or during duels.
Slytherin Harry Potter fanfics often change the sorting, which is a huge alteration to the original story. For example, in the original, Harry is a Gryffindor, but in these fanfics, being in Slytherin means he has different relationships. He may befriend Slytherins who were originally antagonists in the main story.
They often change the relationship dynamics. In the original story, Harry and Draco were rivals. But in these fanfics, they become partners in a marriage. This changes how they interact with each other and their friends. For example, Ron might be initially shocked or skeptical. Also, the power balance between the houses, like Gryffindor and Slytherin, can shift.
They often change the story by making Harry's character more morally ambiguous. Instead of being the pure - hearted hero, he might be tempted by the dark side. For example, he could start using some of the dark magic that the Death Eaters are known for.
These fanfictions can change the power dynamics. In the original story, Harry has certain roles and responsibilities. But in 'Harry and male harem' fanfictions, his relationships with the male harem members can give him different kinds of power or influence. For instance, the male harem members might support Harry in different ways, which could change how he deals with Voldemort or other threats. They also might change the social standing of Harry within the wizarding world, making him more of a central figure in a different way than in the original story.
Often, they change the original story by allowing characters to avoid tragic deaths. For example, if Harry gets a second chance, he might be able to save his parents or Sirius. This then has a ripple effect on the rest of the story, like changing the relationships between characters. Harry might not be as bitter towards Snape if he can prevent certain events.
These fanfictions can also change the relationships between characters. If a pregnancy occurs between two characters who were previously just friends, it can create a more complex dynamic. For instance, Ron and Luna getting together and having a pregnancy could lead to a completely different kind of friendship within the group. It might also introduce new sub - plots related to how they deal with the news, how their families react, and what it means for their future in the wizarding world. The original story was mainly about fighting dark forces, but in these fanfictions, the focus shifts to more personal and family - oriented matters.
One popular 'Harry Potter regenerates' fanfic could be 'A New Beginning for Harry'. In this type of fanfic, the author might explore Harry being reborn or given a second chance in some way, perhaps with newfound powers or different relationships. Another could be 'Regenerated Harry: The Dark Arts Reimagined' where Harry's regeneration leads to a different approach to dealing with the dark arts in the wizarding world.
They often add a layer of modern - day realism. In the original story, things like child abuse at the Dursleys' are more in the background. But in these fanfictions, it becomes a central issue. For example, they might have the Dursleys face legal consequences much earlier in the story.