Perhaps it's a writer who loves Hermione as a character and wanted to give her a different kind of adventure. They might have created this werewolf - Hermione dynamic to show Hermione's ability to handle unusual and potentially dangerous situations in a new way. Without more information, it's impossible to determine the exact author.
Another reason might be that there is a greater force at work in the fanfiction's universe. It could be a prophecy or a magical pact that forbids the werewolf from harming Hermione. This would add an interesting layer of mystery and plot development to the story.
There's also a chance that it's a werewolf from another wizarding community that has come to Hogwarts and has fixated on Hermione. This werewolf could be on a mission, perhaps sent by a dark wizard, and Hermione just happens to be in his path, and he won't leave her alone as part of his orders.
Well, perhaps the werewolf is attracted to Hermione for some special reason. Maybe it's her magical power or her kind heart. In the fanfiction, it could lead to a series of dangerous situations for Hermione, like she has to constantly be on guard against the werewolf's unexpected approaches.
To find out who the author is, you could try searching for the fanfiction on popular fanfiction websites. Look for any author names or pen - names associated with it. Sometimes, these websites have a 'by' section next to the title which will tell you who wrote it.
Perhaps Hermione uses her magic to communicate with the alpha werewolf. She could use a spell to understand its thoughts or emotions. This would be a really interesting twist as it would allow for a deeper connection between them.
There could be many amateur fanfic authors out there who might have written such a story. It's hard to pinpoint just one. There are numerous fanfiction platforms where people with a creative streak and a love for the Harry Potter universe might have come up with this idea.
It could be Alya. She's very curious and adventurous. Maybe she gets too close to some sort of werewolf lore or a werewolf in disguise while investigating for the Ladyblog. And then she gets bitten and turns into a werewolf. This would add a whole new layer of drama to her relationship with Marinette and the other characters.
In some fanfictions, it could be because the author wants to focus on their platonic relationship. They might see their connection as more of a deep friendship or a partnership in the magical adventures rather than a sexual one.
The author of " I Won't Be Bullied by Girls " was a fraud.
The werewolf would be another main character. We don't know exactly who this werewolf is yet, but he or she would be central to the story. Maybe it's a new character created specifically for this fanfiction, or it could be a known werewolf from the 'Harry Potter' universe like Remus Lupin.