Well, in some fanfictions, Harry being bitten by Fenrir Greyback could lead to a change in his relationships. His relationship with Dumbledore might become more complex as Dumbledore tries to guide him through this new and dangerous situation. Also, it could potentially create a rift between him and some of his classmates who are afraid of his new werewolf nature.
In this type of fanfiction, a possible plotline is that Harry's bite could be part of a bigger dark plot. Voldemort or his followers might have orchestrated it to either turn Harry to their side or to make him an outcast so that he can't oppose them effectively. This would add a whole new layer of conflict and drama to the story. Harry would then have to fight not only against the physical changes but also the political and social implications of being a werewolf in a world at war.
He might become more isolated at first. Since being a werewolf is often stigmatized in the wizarding world, he may start to withdraw from his friends. But this could also lead to him becoming more self - reliant.
Fenrir Greyback is significant in Harry Potter fanfiction as he represents a different kind of evil compared to the main antagonists. He's more primal. His actions are often driven by his werewolf instincts. In fanfics, this can be used to create unique horror - themed storylines where characters have to face not just a dark wizard but also a savage werewolf.
Fenrir Greyback in fanfiction can also be a way to explore the werewolf sub - culture in the Harry Potter world more deeply. Some stories might focus on how he influences other werewolves, whether he's a leader or a lone wolf (no pun intended). His character can be used to show the discrimination that werewolves face in the wizarding world, as he's such a violent example of one.
A really interesting plot could be set in an alternate universe where Fenrir Greyback was once a normal wizard but was turned into a werewolf by dark magic. Harry Potter, through some magical accident, finds himself in Greyback's past and tries to prevent his transformation, which would change the course of the entire wizarding world as they know it.
One possible interesting story could be one where the relationship between Fenrir Greyback and Harry Potter is explored in a context of unexpected alliances during the wizarding war. Maybe they find themselves having to work together against a common dark magic threat that neither could face alone.
One interesting plot could be Fenrir Greyback trying to turn Harry Potter into a werewolf as a way to get back at Dumbledore or the Order of the Phoenix. He might see Harry as a symbol of the resistance against the Dark Arts and wants to corrupt him in the worst way possible.
One interesting 'Harry Potter x Fenrir Greyback' fanfiction could be one where Harry has to face Fenrir in a more psychological battle rather than just a physical one. It might explore how Harry tries to understand Fenrir's motives and the dark magic that has consumed him. Another could be a story where Fenrir is redeemed in some way through his interactions with Harry, perhaps seeing a glimmer of humanity in himself again.
One possible consequence could be her transformation into a werewolf. In many werewolf lore within the Harry Potter universe, a bite from a werewolf like Fenrir Greyback often leads to lycanthropy. This would mean that Hermione would have to deal with the monthly transformations, and she would likely face discrimination from some in the wizarding world who are prejudiced against werewolves.
Well, perhaps Harry would be more isolated in this fanfiction. Since Greyback is a feared werewolf, other magical beings might avoid Harry. This could lead to him developing a very self - reliant nature. He might also have a different view on magic. Instead of using it for good in the traditional sense, he could use it more for survival and protection, which would put him at odds with some of the more morally upright characters in the Potterverse.
A plot could involve Fenrir being cursed in a way that makes him lose his werewolf - like aggression and he seeks help from Harry Potter, who is known for his kind heart. Harry initially distrusts him but then realizes Fenrir's genuine need for help. Or perhaps they are both caught in a time - travel spell and end up in a different era where they must rely on each other to get back to their own time, while also dealing with the challenges of that new time period.