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.
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.
A forest nymph could be important. She might guide Harry through the forest, teaching him about the plants and their magical properties.
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.
One possible plot could be that Harry discovers his vampire heritage early on. Maybe his parents were involved with vampires in some way. As he grows, he has to hide his vampire tendencies from his Hogwarts friends while also learning to control his new powers, like super strength and enhanced senses. He might struggle with the urge to drink blood and have to find a substitute in the wizarding world.
One possibility is that Harry would face different types of dark magic in Japan. Japanese dark wizards might have their own motives and methods. Harry, growing up in Japan, would have to adapt to the Japanese way of fighting dark magic. He could also be involved in cultural exchanges between the Japanese wizarding world and the British one. Maybe he'd introduce Quidditch to Japan but also learn about Japanese magical sports. His character would be shaped by the Japanese values of respect and perseverance, which would add new dimensions to his personality.
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.
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.
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.
Perhaps the wings grow as a result of some ancient magic that has been awakened within Harry. He could be exploring an old, forgotten part of Hogwarts and accidentally triggers a spell or a curse that gives him wings. At first, he might be scared and try to hide them, but as he learns to control them, he realizes they can be used for good, like helping him rescue trapped students or animals in the Forbidden Forest.
In a wild fanfic where Harry Potter grows up, he might have all sorts of out - of - the - ordinary adventures. Maybe he'd encounter new magical creatures not in the original books. He could also develop different relationships with his friends. For example, his friendship with Ron and Hermione might take unexpected turns, like having a big fight over a new magical discovery and then reconciling in a more dramatic way.