There are likely to be. Since fanfiction is a vast and diverse realm, it's quite possible for someone to have written about faery heroes in relation to Harry Potter. These faery heroes could be from a hidden part of the wizarding world, with their own culture and magic that intersects with the main story of Harry Potter.
Sure. Fanfiction writers love to explore new concepts and characters. Faery heroes could be introduced to add an extra layer of magic and mystery. They might be guardians of a certain magical artifact or a secret place, and their heroic deeds could involve protecting these from Voldemort or his followers.
They can be introduced as allies. For example, they could come to Hogwarts when they sense the dark forces rising. Their faery magic could be different from the regular wizarding magic, like being able to control nature in ways wizards can't. This would make them valuable in battles.
In Harry Potter fanfic, a faery hero could be a character with magical faery abilities who uses them to fight dark forces. For example, a faery who can manipulate time and space to outwit Voldemort's minions. They might also use their natural charm and allure to deceive the enemy, like luring Death Eaters into a trap with their faery magic.
They can be incorporated as new magical creatures in the Forbidden Forest. Maybe they have their own hidden enclaves there and interact with Hogwarts students who stumble upon them. For instance, a faery hero could offer help to a lost student by using its faery magic to guide them back to the castle.
A common theme is the clash between the faery world and other supernatural elements. For example, faeries might be at odds with vampires or werewolves. Another theme is the power struggle within the faery community itself. Some fanfictions also focus on a faery's journey of self - discovery in a world full of supernatural chaos.
Interaction might involve a bit of competition too. The demigods are used to physical combat and using their powers in a more direct way. The wizards, with their spells, might seem a bit sneaky to the demigods at first. However, they could learn from each other. A demigod could learn how to use a disarming spell, and a wizard could learn how to fight without relying on a wand from the demigods.
The meeting could also lead to some interesting cultural exchanges. The heroes of Olympus could introduce the concept of the Greek pantheon to the Hogwarts students. In return, the Hogwarts students could show them how to play Quidditch. Hermione would probably be really interested in learning about the ancient Greek magic that the heroes of Olympus might know. And Annabeth would be eager to study the books in the Hogwarts library.
Obviously, Harry Potter himself would be a main character. He has the most experience in fighting dark wizards.
A great concept for Harry Potter heroes crossover fanfiction would be to cross them with the characters from the Star Wars universe. Picture Hermione using her intelligence to outwit Darth Vader. Or Harry learning some Jedi mind tricks. Also, a crossover with the characters from the Percy Jackson series. The demigods and the wizards could have an interesting interaction. Maybe they could combine their powers to defeat a common foe that threatens both the magical and the mythological worlds.
One possible interesting plot could be a crossover where the heroes from the Throne of Heroes are summoned into the Harry Potter world. They could use their unique powers and abilities to help in the fight against Voldemort. For example, a heroic archer from the Throne of Heroes could provide long - range support during battles at Hogwarts.
Harry Potter himself could be the main character. He could be the one who discovers the connection between his world and the Throne of Heroes. He might then use this knowledge to gain new allies and powers to fight against the dark forces in his world.