One reason could be the contrast between them. Fenrir is a dark, savage werewolf and Hermione is a smart, strong - willed witch. Writers like to explore the dynamic of such opposite characters being drawn to each other. It creates a lot of potential for conflict and drama in the story.
Well, in fanfiction, it might be because of Hermione's unique allure. She has this intelligence and courage that could be seen as fascinating to a character like Fenrir Greyback. Also, it gives a chance to rewrite the traditional good - vs - evil narrative and delve into the complex psychology of attraction, even between a villain and a hero - like figure.
Perhaps it's the allure of the 'forbidden'. Fenrir Greyback is a dark and dangerous character, and exploring his relationship with Hermione in fanfiction might be an exploration of the contrast between light (Hermione) and dark (Greyback).
Their relationship might develop through a series of tense encounters. Fenrir might be initially attracted to Hermione's magic and her strong will. As they interact more, Hermione could start to see a glimmer of humanity in Fenrir, despite his monstrous actions. This could lead to a complex relationship where she tries to reform him in some way, while he struggles with his dark nature and his growing feelings for her.
One common theme could be redemption. Since Fenrir is a rather dark character, the fanfiction might explore the idea of him being redeemed through his relationship with Hermione. Another theme could be the struggle between good and evil within the relationship. Hermione represents good and Fenrir represents evil, and their relationship could be about how these two forces interact.
In one fanfiction concept, Greyback saves Hermione when she is trapped in a magical maze created by dark wizards. Greyback, being a cunning and experienced dark creature, is able to navigate the maze and get to Hermione before the maze collapses or she is killed by the various traps inside. He might save her because he senses that she has a great potential that could be useful to him in the future.
There's a fanfiction called 'Greyback's Redemption Arc'. In it, Fenrir Greyback saves Hermione from a group of Death Eaters. The author might have written it to explore the idea of redemption for a character like Greyback. Maybe he saves Hermione because he sees her as a symbol of the good in the wizarding world that he has lost touch with, and this act of saving her could be the start of his journey towards redemption.
There could also be a fanfiction where Hermione Granger is forced to face Fenrir Greyback alone in a dangerous situation. This would showcase her bravery and her ability to use her magic skills under extreme pressure. The story could focus on her mental and magical struggle against Greyback, perhaps with her using some of the more advanced spells she has learned over the years to defend herself and those around her from the werewolf's attacks.
It's quite controversial. Fenrir Greyback is a villainous character who preys on others, especially children. Hermione represents all that is good in the wizarding world - intelligence, friendship, and justice. Combining them in a'mate' relationship in fanfiction distorts the values of the original series. However, some might explore it to show extreme character arcs or alternate universes, but it's not a common or uncontroversial theme.
One common plotline could be Hermione finding ways to outwit Fenrir Greyback. For example, she might use her intelligence and knowledge of magic to set traps or create diversions. Another could be other characters coming to Hermione's rescue, like Harry and Ron realizing she's in danger and using their skills to protect her from Greyback.
Yes, there are likely some out there. Fanfiction is a vast world and many writers explore different and often unexpected relationships in the Harry Potter universe. However, Fenrir Greyback is a rather dark and dangerous character, so such a story would probably be very complex and perhaps a bit dark as well.
Yes, there are likely some fanfictions out there with this theme. However, it's important to note that Fenrir Greyback is a rather dark and dangerous character in the Harry Potter universe, and such a plot might explore some very complex and often disturbing ideas. Fanfiction can take many different directions with this concept, from exploring the horror of Greyback's interest to potential redemptive arcs.