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.
There are likely numerous fans out there writing 'naruto hyperventilates fanfiction'. It could be a group of friends who are all into Naruto and they each contribute to the story. Some might be experienced fanfiction writers who have been in the Naruto fanfiction community for a while and decided to create a story around this concept. Others could be newbies to writing but are so passionate about Naruto that they give it a try.
In this 'naruto hyperventilates fanfiction', it could be that Naruto is trapped in a sealed space with limited air, which makes him hyperventilate. Another possibility is that he's under a powerful genjutsu that messes with his breathing control and makes him hyperventilate. It might also be a comical situation where Naruto eats something really spicy and his body reacts with hyperventilation. Fanfiction writers have a lot of creative freedom to play around with the characters' situations.
Obviously Naruto would be one of the main characters since he is the one writing the book. His friends like Sasuke and Sakura would also likely be important characters as they have been part of his life journey.
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.
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.
It could be about Naruto writing a book that details his adventures and the lessons he's learned. Maybe he writes about his friends and how they all grew together.
There are many talented writers in the fanfiction community. However, it's hard to single out just one. Some popular writers often have a deep understanding of the Twilight lore and Zafrina's character, and they create engaging stories that are well - received by fans.