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.
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.
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.
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.
I'm not sure of specific writers off - hand. But you can often find good ones by looking at popular fanfiction websites and checking the reviews. Writers who get a lot of positive feedback are usually worth checking out.
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.
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.
One plot idea could be Fenrir Greyback being forced to work with Harry Potter to defeat a common enemy. Maybe a dark wizard who is more dangerous than Voldemort is threatening both the wizarding world and the werewolf community. This would put them in an uneasy alliance, with Harry having to trust Greyback not to turn on him.
Yes, there might be some fanfiction exploring such a relationship. However, it's a rather dark and unusual concept considering Fenrir Greyback's nature as a werewolf. Fanfiction often takes creative liberties and delves into different and sometimes controversial pairings.