Perhaps Harry's angel wings are a sign of a greater destiny. In the fanfiction, it could be revealed that he has an ancient magical heritage related to angels. This discovery might lead him on a quest to find out more about his past and the powers that come with the wings. He might meet other magical beings with similar traits along the way.
One possible storyline could be that Harry discovers his angel wings during a dangerous battle at Hogwarts. The wings give him the ability to fly faster and more gracefully than a broomstick, allowing him to outmaneuver the dark forces. He could use them to rescue his friends from precarious situations, like flying them to safety when the castle is under siege.
In this fanfiction, Harry's butterfly wings might be a key to unlocking an ancient mystery at Hogwarts. The wings have special markings that match those on an old, forgotten tapestry in the castle. As he explores the meaning of these markings, he discovers that they are linked to a long - lost magic that was once used to protect the school. With his wings, he is able to access hidden chambers and passages that no one else can reach, leading to a series of exciting and dangerous escapades as he tries to piece together the mystery.
One idea could be that a new character with black angel wings arrives at Hogwarts. This character might be a mysterious figure, perhaps a guardian sent to protect Harry Potter from a new and unknown threat. Their black wings could symbolize a different kind of magic, not fully understood in the wizarding world. Another plot could involve Harry himself being magically bestowed with black angel wings, which gives him new powers and abilities but also makes him a target of those who fear the unknown in the magical community.
One idea could be that Hermione discovers her angel wings during a dangerous adventure in the Forbidden Forest. The wings give her the ability to fly and she uses this new power to rescue her friends from a menacing creature. Another could be that she has the wings from birth but has been hiding them in the wizarding world for fear of being different. But when Hogwarts is in a great peril, she reveals her wings to save the school.
One interesting storyline could be that Harry discovers his moon powers during a full moon at Hogwarts. Maybe he can communicate with magical creatures that are only active during the full moon. Another could be that his moon powers are linked to a hidden prophecy, and Voldemort wants to steal those powers for himself.
One interesting storyline could be that his younger siblings are sorted into different houses at Hogwarts. For example, one might be in Hufflepuff while Harry is in Gryffindor. This could lead to some sibling rivalry as well as moments of them coming together to face challenges. Another could be that his younger siblings have unique magical abilities that Harry doesn't possess, and they end up helping him in unexpected ways during his battles against Voldemort.
Well, a storyline could revolve around the mystery of her blindness. Maybe it was caused by a dark spell when she was a baby, and as the story progresses, Harry and his friends try to find a way to reverse it. Meanwhile, she is learning to be independent and strong. She could also form a special bond with some magical creatures that are attracted to her unique situation. For instance, a thestral might befriend her because she can sense its presence without seeing it in the normal way.
Perhaps a fanfiction could show Harry's relationship with his professors in a new light. Some professors, like Professor Snape, might initially be unsympathetic, seeing it as a Muggle weakness. But as the story progresses, they could come to understand the gravity of his situation and help him in their own ways. Dumbledore, on the other hand, could use his wisdom to guide Harry in accepting his condition and still being a great wizard.
One possible 'Harry Potter' fanfiction with angel wings could be about a character, perhaps Harry himself, suddenly sprouting angel wings during a dangerous encounter. It might be a magical transformation that gives him new powers to fight against dark forces. For example, the wings could allow him to fly faster than a broomstick and he could use this new ability to escape from Voldemort's clutches or to quickly reach his friends in need.
One possibility could be a curse or a blessing from a powerful being. Maybe Naruto encounters a god - like entity during one of his adventures who bestows the angel wings upon him as a way to test his character or give him new powers to face an upcoming threat.
I'm not sure of a specific 'Harry Potter' fanfiction just about angel wings off the top of my head. But you can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. You can search for the tags 'Harry Potter' and 'angel wings' and browse through the results. There are likely to be some creative and interesting stories there.