The people who write 'the novel's extra fanfiction' are often avid readers of the original novel. They could be from all walks of life. Some might be students who are inspired by the novel and want to practice their writing skills by creating fanfiction. Others could be adults who have a lot of free time and enjoy delving deeper into the fictional world of the novel. They write it out of their love for the story, the characters, or simply because they had an idea that they thought would be interesting to explore within the context of the novel.
Typically, it's written by fans of the novel. These could be people who are really passionate about the story and its characters.
Often, amateur writers who are fans of the wizarding world create such fanfictions. They might be inspired by their love for the original books and movies. Some might be part of fanfiction communities where they share their works. There could also be some relatively unknown writers who just have a creative idea about Harry and his pet and decide to write it down.
There could be many different authors writing 'Charlie's Twilight fanfiction'. Fanfiction is often written by fans of the Twilight series who are interested in exploring different aspects of the story or characters. It could be written by amateur writers who just love the world of Twilight and want to create their own stories centered around Charlie.
Fans of the character Carl usually write Carl fanfiction. They are often people who are really into the story that Carl is from and want to create their own versions of his story.
Fans of Onew write onew fanfiction. They are often people who are really into Onew as an artist, and they use their writing skills to create fictional stories about him.
There could be many different fans who write it. It might be an amateur writer who just loves Naruto and wanted to explore this unique scenario.
It could be written by amateur writers just starting out in the RWBY fanfic world who see commissions as a way to gain experience and make a bit of money or get some recognition. There might also be more experienced writers who do it for the fun of exploring different ideas within the RWBY universe that they might not have thought of on their own. And sometimes, a group of RWBY fans might collaborate on a commissioned fanfic, each bringing their own strengths to the writing process.
It could be written by fans who are really interested in the concept of 'old crow'. Maybe people who have a passion for the original source (if there is one) that the 'old crow' is related to.
Fans of Robert Pattinson and Kristen Stewart write robsten baby fanfiction. These are often fans who were really into their relationship on - and off - screen and like to imagine different scenarios involving a baby in their relationship.
There could be many different authors who write 'harry is trained fanfiction'. Fanfiction is a very open - ended and community - driven form of writing. It could be written by an amateur writer who is a huge fan of the original work (presumably something related to a character named Harry). They might write it just for fun or to explore a different side of the character that they feel wasn't explored enough in the original.
Well, often it's written by Pokémon enthusiasts. They might be people who have been following Ash's journey since the beginning and feel like they have a good understanding of his character. These fans might write the fanfiction to give Ash a satisfying ending or a new adventure that they think he deserves. It could be a young writer who is just starting out and using the Pokémon universe as a creative outlet, or an older fan who has been in the fandom for a long time and wants to contribute their own take on Ash's story.