Perhaps a fanfiction where the sorting hat places a character into Gryffindor because of their Dirty Harry - like qualities. This character then uses their boldness and determination in a different way than the typical Gryffindor. Instead of relying on magic spells all the time, they might use their wits and physical skills, like Dirty Harry, to get out of tricky situations in the Hogwarts castle or during battles against dark forces.
One idea could be a character who uses Dirty Harry - like tactics to deal with the Death Eaters. For instance, being extremely direct and fearless in the face of danger, much like Dirty Harry in his movies.
Some unique ideas could be that baby Harry has a special bond with magical creatures from a very young age. For instance, he might be able to communicate with Hedwig even as a baby, through some kind of magical telepathy. This could set up a whole different dynamic in the story.
In some 'Harry Potter Harem' fanfictions, a unique idea is to have the 'harem' members be those who have been wronged by the dark side in different ways. They bond with Harry as they all strive for justice and a better wizarding world. For instance, a character whose family was destroyed by Death Eaters joins Harry's group. This creates a deep emotional connection among the group members and a strong motivation for their actions. It also gives a new perspective on the fight against evil in the Harry Potter universe, as they work together not just for Harry's sake but for their own and the world's.
Well, in some fanfictions, Loki might be interested in the Time - Turner device from the Harry Potter universe. He could try to use it for his own purposes, like going back in time to change certain events in the wizarding world to his advantage. Or perhaps Loki and Harry Potter get into a magical duel where Loki uses his Asgardian magic and Harry uses his wizarding spells. The contrast between their different forms of magic would be really interesting to explore in a fanfiction.
A unique idea could be that a Transformer is enchanted by a wizard to be able to use magic. So it becomes a sort of magical - mechanical hybrid. It could use spells like the wizards and also transform into different forms. For example, it could transform into a broom - like form to fly around Hogwarts.
A Harry Potter and Star Wars crossover would be really interesting. Picture Harry and his friends traveling through space in the Millennium Falcon, learning about the Force and using their magic in combination with Jedi skills to fight against a new dark threat that combines the power - hungry Sith and the dark wizards from the Potterverse.
Well, you could get a tattoo of a character from the fanfic in a unique pose or situation that didn't happen in the original books. For instance, if the fanfic has a scene where Harry Potter is using a new kind of magic, you could get a tattoo of him doing that. Or perhaps a tattoo of the fictional location in the fanfic that was really well - described and has a special place in your heart.
One unique idea could be that Harry uses telekinesis to communicate with magical creatures in a new way. Instead of using spells or words, he can move objects to convey messages.
A unique idea could be a fanfic where Sirius Black time - travels. He could go back to his school days and try to change certain events that led to his future troubles. This would be an interesting way to explore his character development in a different timeline.
Perhaps in this fanfiction, there could be a group of magical bats that are guardians of an ancient Hogwarts secret. Harry, as he befriends them in his bat form, gets drawn into this mystery. These bats could have their own language and culture that Harry has to learn. For example, they might communicate through a series of ultrasonic sounds that only a bat - like Harry - can understand. This could lead to a whole new adventure for Harry, separate from the main battles against Voldemort but still relevant to the overall protection of the wizarding world.
One unique idea is when the portraits of Harry's ancestors can come to life and physically interact with the present world. For example, they might help Harry in a battle against dark wizards by using ancient spells they knew. It adds an exciting dimension to the story.