There could be many amateur fanfic writers out there. It might be someone who really loves the Harry Potter series and wanted to create a really unique and funny story. So it could be just an unknown fan who wanted to put their own spin on the wizarding world.
It could potentially be a group of fans who got together and wrote this fanfic collaboratively. They might have shared ideas on how to make Harry's situation of growing a tail as interesting as possible, and combined their different writing styles to create this piece of fanfiction.
Maybe it could be due to a misfired spell in Hogwarts. Some student might accidentally cast a spell on Harry, and instead of the intended effect, it makes him grow a tail. It would be a really strange and comical situation for him.
There could be many amateur authors out there who might write such a fanfiction. It could be a young, creative Harry Potter fan who loves to imagine new and exciting adventures for the characters. They might be inspired by their love for the series and the idea of giving Harry a new and unique ability like growing wings.
It could be a new dark wizard who targets Harry because of his fame. This wizard might be jealous of Harry's status as the hero who defeated Voldemort and wants to prove himself as more powerful.
The fanfic might explore how Harry's upbringing in the wizarding world affects his mental state as he ages. He could struggle with the pressure of being 'the boy who lived' and having so many expectations placed on him. For example, he might have anxiety about always having to be the hero. Also, his relationships with friends like Ron and Hermione could change as he matures and they all face different challenges in life. This could all be part of the psychological growth aspect of the fanfic.
A forest nymph could be important. She might guide Harry through the forest, teaching him about the plants and their magical properties.
One possibility is that Harry has to fend for himself on the streets, learning basic survival skills like finding food and shelter. He might meet other outcasts who become his makeshift family, and together they look out for each other. Maybe he discovers some latent magic abilities on his own, without the guidance of Hogwarts, which he uses to protect his new friends from the dangers of the street.
In this fanfic, perhaps Harry grows up isolated in the forest and has to rely on his own instincts and the magic within himself. He could stumble upon an old, hidden wizarding settlement in the forest that has been long forgotten. There, he finds ancient spells and artifacts that not only help him grow as a wizard but also give him a unique connection to the past of the wizarding world. This experience in the forest would shape him into a different kind of wizard compared to what we see in the original series.
The plot could develop with Harry having to face the harsh rules of Azkaban. He might start to form alliances with other prisoners who are wrongly accused, like his father's friends perhaps. And as he grows, he starts to understand the dark secrets of the wizarding world from a different perspective, one that is filled with the pain and injustice of Azkaban.
Well, perhaps he could discover new magical abilities related to orgpange. Maybe he'd use these unique powers to fight against the dark forces in a different way than in the original story.
Maybe some of the Hogwarts professors like Professor Sprout. After all, she's the Herbology teacher. She could give Harry some expert advice on how to grow different kinds of food plants. She might even let him use some special greenhouses or tools in the school for his food - growing projects.