One could be a story where Harry Potter has to use crutches after a particularly dangerous encounter with a dark creature in the Forbidden Forest. The crutches become a symbol of his vulnerability yet also his determination to keep fighting against the dark forces.
You can start by looking on popular fanfiction websites such as FanFiction.net or Archive of Our Own (AO3). Just type in 'Harry Potter has crutches' in the search bar and you'll likely find some relevant stories. AO3 in particular has a large and diverse collection of fanfictions.
One great fanfiction could be about Harry having a hearing disability. It might show how he uses magic to compensate, like creating spells to read lips or enhance sound in a different way. Another could be where he has a physical disability, perhaps from a dark magic attack that left his leg not fully functional, and how he overcomes challenges in Hogwarts, like climbing the stairs with the help of his friends and magic.
One popular 'Harry Potter has muscles' fanfiction might be where he uses his newfound muscular physique in a duel. Maybe he's able to overpower his opponents more easily with his strength, adding a new dimension to the magical battles.
One 'Harry Potter has horns' fanfiction might explore a unique magical transformation where Harry develops horns as a result of a dark spell gone wrong. It could be a really creative take on the story, showing how he has to deal with this new physical feature while still facing Voldemort and other challenges.
One interesting fanfiction could be where Harry's mismatched eyes are a sign of a hidden magical power. Maybe they allow him to see different magical frequencies or dimensions that others can't. Another could be a story where his eyes are the result of a complex family magic that was long forgotten.
There are many directions a 'Harry Potter has class cards' fanfiction could take. It could be that the class cards are actually enchanted items from an ancient wizarding era. In the fanfiction, Harry and his friends might discover that the cards hold the key to a long - lost magic. Maybe the class cards are tied to the houses in a new way. Instead of just the points system, the class cards could determine which house gets special resources for a term. For instance, Gryffindor could earn a set of class cards that give them exclusive access to a new training ground for Quidditch. This would add a whole new layer of competition and cooperation within the Hogwarts community.
A great 'Harry Potter has dragon blood' fanfiction could be one where his dragon blood gives him the ability to communicate with magical creatures on a deeper level. In this story, let's call it 'Harry and the Dragon - Blood Bond', Harry uses this newfound skill to bring together different factions of the magical world that were previously at odds, all because of his special dragon blood heritage.
One interesting Harry Potter 1945 fanfiction could be about the early days of Hogwarts and how the magical world was different back then. Maybe it focuses on the founding of certain magical traditions that we see in the main series but are not fully explored. For example, it could detail how the houses were originally established and what the selection criteria were like in 1945.
One interesting fanfiction could be about Albus Potter's adventures at Hogwarts that mirror his father Harry's, but with his own unique twists. For example, he might face a new dark wizard threat that is related to the past but in a different way. Another could be a story where Albus discovers a long - lost spell that Harry never knew about and uses it to save the wizarding world. There are also fanfictions that focus on the relationship between Albus and his family, like how he copes with the pressure of being Harry Potter's son.
In some fanfictions, Smart Potter is not just book - smart but also socially smart. He uses his intelligence to understand the political undercurrents in the wizarding world. He might form alliances with different houses and magical creatures to bring about a more inclusive and harmonious wizarding society, all while still being a student at Hogwarts and dealing with his regular classes.