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.
Another possibility is that he uses some ancient magic that he discovers in the Forbidden Forest or some old wizarding books. This magic could be more in tune with nature and be used specifically for growing food. It might involve some sort of connection with the earth and the natural cycles of growth.
He could use the Herbivicus Charm. This charm is often used to make plants grow. In the fanfiction, it might be enhanced to quickly grow all kinds of food crops like pumpkins, carrots, and strawberries. It would be really cool to see Harry using this charm in a big field and within seconds, there are rows of fresh, ripe vegetables.
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.
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.
Definitely Ginny. Since she's Harry's love interest in the original series, in the fanfiction about them growing up, she has a big role. She could be shown as a strong, independent witch who is equal to Harry in many ways. Draco Malfoy is also a character that features a lot. Sometimes, fanfiction explores his redemption arc further as he and Harry have to interact in the post - war wizarding world.
Hermione could be another main character. Maybe she discovers what's happening to Harry and the author and tries to find a way to reverse it or at least understand it better. She could use her vast knowledge of magic to research the phenomenon.
One difference could be his personality. Growing up in an orphanage might make him more independent and self - reliant from a young age. He would have to fend for himself more without the Dursleys' influence, which could also make him more distrustful of adults initially.
Well, for one thing, he might have a different accent. American wizards could have a more brash and outspoken style compared to the more reserved British ones in the original. Also, the school system might be more like American Muggle schools, with things like sports being more hyped up, perhaps a version of Quidditch that's more in line with American football in terms of fanfare.
Well, for one thing, he might speak French fluently. His magical education could be influenced by the French wizarding schools' curriculum. Maybe he'd have different friends, like French wizards and witches, and their culture would be a big part of his life.