The Akatsuki could be antagonists. They might see the power of Fenrir and Naruto's connection to it as a threat to their plans. So they would try to either steal Fenrir from Naruto or kill them both to prevent any interference.
One possible plot could be that Naruto discovers Fenrir in a hidden realm. He tries to hold Fenrir back from causing chaos in the ninja world. Naruto, using his strong will and chakra, forms a bond with Fenrir over time and convinces it to use its power for good instead of destruction.
It could be other Death Eaters. They might suspect that Fenrir is up to something with Hermione and try to stop him. For example, Bellatrix Lestrange could be a major antagonist. She's known for her cruelty and loyalty to Voldemort, and she might not trust Fenrir's actions regarding Hermione.
Well, in this kind of fanfiction, Fenrir might be protective of Harry perhaps because he sees something special in Harry. Maybe he has his own reasons that are different from the normal perception of their relationship in the original works. It could be that Fenrir has a change of heart or there are some hidden plot elements that make him want to safeguard Harry.
In Norse mythology, Fenrir is a gigantic and terrifying wolf. He was born from the union of Loki and the giantess Angerboda. The gods were afraid of Fenrir's growing strength and decided to bind him. They made chains to hold him but Fenrir broke them easily. Eventually, they tricked him into being bound by Gleipnir, a special chain made with the help of dwarves. Fenrir is prophesied to play a major role in Ragnarok, the end of the world in Norse mythology.
At the start, Hermione would be appalled by Fenrir's cruelty. She would be enraged that he has caused so much harm to innocent people. But as she delves deeper into getting to know him, she would start to see the complex web of factors that contributed to his behavior. She might see the neglect and discrimination he faced as a werewolf, which could make her feel a bit of pity. However, she would still firmly oppose his cruel actions and try to find a way to either contain or reform him, all while being acutely aware of the danger he poses.
Fenrir might be intrigued by Hermione fanfiction because Hermione is a very intelligent and powerful character. Fanfictions often explore her potential in new and exciting ways, like her delving into different branches of magic or having unique adventures. This would be interesting to Fenrir as he may be curious about how she uses her wits and magic in these alternate scenarios.
Well, 'fenrir harry potter fanfiction' might deal with Fenrir's role as a werewolf in the wizarding world. It could explore how his lycanthropy affects the plot, perhaps in some alternate scenarios. For example, it could show his interactions with the werewolf community and how that in turn impacts the overall story of Harry Potter. Fanfiction often takes existing elements and twists them in new and interesting ways, and with Fenrir, there are a lot of possibilities. He's such a menacing character, and fanfic writers could delve deeper into his psyche or create new storylines around him.
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.