Well, in some 'harry potter headcanons fanfiction', it's thought that Draco Malfoy has a change of heart much earlier than in the books. Maybe he starts to secretly help the Order of the Phoenix because he realizes the error of his ways. Also, there could be a headcanon where the Marauder's Map actually has a hidden function that only a true Gryffindor can unlock. And perhaps the house - elves have a whole underground network where they trade magical items and secrets among themselves.
One idea could be that Neville Longbottom is secretly a powerful wizard all along but has been suppressing his power due to self - doubt. Another could be that the Hogwarts portraits have their own little society and gossip network within the castle walls. And a third one might be that Hagrid has a secret family of magical creatures in the Forbidden Forest that he takes care of.
Some 'harry potter headcanons fanfiction' might include the idea that Hermione actually has a distant relative who was a dark wizard, and she has to struggle with that knowledge. There could also be a headcanon that the Sorting Hat has a mind of its own and sometimes purposely mis - sorts students to teach them a lesson. Additionally, it could be imagined that the Forbidden Forest holds ancient magic that can only be accessed by those with pure intentions, and Harry unknowingly has this ability.
One interesting headcanon could be about the backstories of the Servants. For example, there might be a headcanon that a certain Servant had a secret friendship in their past life that influenced their character in the game. Another could be related to the magic system in the Fate Grand Order universe, like a unique way of casting spells that isn't shown in the main story.
Well, a popular headcanon is that Percy can see the memories of the ocean. So in fanfiction, he might touch an old piece of coral and suddenly be flooded with images of ancient sea battles or long - lost civilizations. Also, some think that Annabeth has a fear of heights that she hides really well because she doesn't want to seem weak. As for Grover, perhaps he has a family of satyrs in a hidden grove that he secretly visits and they tell him old satyr tales that he then uses to his advantage on quests.
One interesting idea in 'Harry Potter' fanfiction is the concept of alternate universes. For example, a fanfic might explore what would happen if Harry was sorted into Slytherin instead of Gryffindor. This could lead to a completely different set of relationships and storylines. Another idea could be time - travel fanfics where characters go back in time to change certain events in the wizarding world's history. It adds a whole new layer of complexity and intrigue to the original story.
It can add more depth to minor characters. For example, by creating headcanons about characters like Lavender Brown, we get to see a side of the Hogwarts student body that wasn't fully explored in the original. It gives them more personality and backstory.
A great idea for a Harry Potter parody fanfiction could be to set the story in a different time period, like the 1920s. The characters would have to adapt to the different fashion and social norms while still being wizards. Another concept is to have the Marauders be total opposites of their original selves. Instead of being mischievous, they are super - serious and overly proper. And for a really funny take, you could write a fanfiction where the Quidditch matches are more like a circus act. The players are on brooms that do crazy stunts on their own, and the Snitch is a living, talking creature that taunts the seekers.
Some fanfictions might focus on the emotional dynamics. How Harry Potter, for instance, could balance his feelings for multiple partners. It could show a more complex side of love in the magical world, where loyalty, jealousy, and deep affection all play out in unique ways compared to monogamous relationships in the original story.
In a 'Harry Potter' and 'Naquadah' fanfiction, it could be that an ancient wizard in the past used Naquadah to build a hidden magical structure. Now, Harry and his friends stumble upon clues about it. As they investigate, they learn about the connection between the two. They might find that Naquadah can be used to unlock hidden chambers in Hogwarts that were previously unknown. This would add an element of mystery and adventure as they explore the new areas and deal with any magical protections or traps left behind by the ancient wizard.
Some fanfiction ideas might include a story where Fry from Futurama is revealed to have some latent magical powers like those in Harry Potter. He then has to go to Hogwarts to learn how to control them. Or perhaps Professor Farnsworth creates a machine that can transport people to the world of Harry Potter, and the Futurama characters go on an adventure there, meeting the likes of Dumbledore and Voldemort. Also, there could be a fanfic where the Sorting Hat is used on the Futurama characters to see which Hogwarts house they would belong to.
Training in magical creature handling is also a great concept. Characters could be taught how to approach and communicate with different magical creatures like unicorns or hippogriffs. This training would involve learning their behaviors and how to gain their trust. It could also include training on how to defend against dangerous magical creatures.
Well, in some 'harry potter summoner fanfiction', there could be the idea of summoning magical creatures from different eras or regions. For example, summoning a long - extinct magical beast to aid in a battle against the dark forces. It adds a new and exciting dimension to the Harry Potter universe.