For Harry Potter spaceship fanfiction, here's an interesting thought. The Death Eaters could steal a powerful magic - powered spaceship and plan to conquer other planets to expand their dark magic influence. Harry and his friends, along with some Aurors, must board their own spaceship to stop them. On the journey, they discover that there are magical constellations in space that can enhance their magic if they can figure out how to harness their power. They also have to deal with the zero - gravity environment which affects their spell - casting in unexpected ways.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.
Well, perhaps Harry uses his magic in a creative way to gather materials for the spaceship. He might use spells to shape the metal and assemble the parts. Then he could enchant the ship with magical protections and propulsion systems that are a blend of magic and some sort of wizard - made technology.
One interesting plot idea could be exploring what would happen if Harry had a different upbringing, like being raised by the Malfoys. It would completely change his view of the wizarding world and his relationships. Another idea might be a time - travel fanfic where Harry goes back to the Marauders' era and interacts with his parents and their friends. This could lead to him preventing certain tragedies or changing the future in unexpected ways. And then there's the concept of a fanfic where the roles are reversed, and Voldemort is the one trying to protect the wizarding world from a greater evil, with Harry being the main antagonist.
One idea could be a fanfiction where the headmaster has to deal with a new, mysterious dark magic that is affecting the students' dreams. Another could be about a headmaster from a different wizarding school coming to Hogwarts for an exchange program and the chaos that ensues. Or perhaps a story where the headmaster discovers a long - lost spell in the Hogwarts library and has to decide what to do with it.
One idea could be exploring an alternative version of the Triwizard Tournament. For example, what if the tasks were designed by a dark wizard who had infiltrated the Ministry of Magic? This would add a whole new level of danger and mystery to the story. Another idea could be focusing on a character other than Harry in the tournament. Maybe Neville Longbottom gets chosen by the Goblet of Fire and has to face his own fears and insecurities throughout the tasks. It could show his growth and transformation into a more confident wizard.
One idea could be Harry discovers he's an Animagus early on, perhaps in his second year. He turns into a stag like his father and uses this form to explore the Forbidden Forest secretly. Another could be that he has to hide his Animagus form from the Ministry which is on high alert for unregistered Animagi.
One idea could be an apprentice learning advanced potions from Snape. They might discover a new potion formula together. Another could be an apprentice in the art of defensive magic under Moody. They could learn unique spells and how to counter dark magic attacks.
A possible plot for 'Harry Potter as a Necromancer' fanfiction is that there is a hidden necromancy school within Hogwarts that only reveals itself to those with the true potential for necromancy. Harry stumbles upon it and is drawn into a world of dark magic and secrets. He has to learn how to control his necromantic powers while also dealing with the internal struggle of whether this magic is truly evil or if it can be used for good. His friends might be divided in their opinions, with some supporting him and others fearing his new abilities.
One idea could be a wedding between a wizard from Gryffindor and a witch from Slytherin, which could cause a stir among the Hogwarts alumni. They might have to overcome the old prejudices of their houses. Another could be a wedding set during a time of peace after the battle of Hogwarts, with characters like Harry and Ginny as guests, and the wedding could incorporate a lot of traditional wizarding wedding elements like flying doves made of light magic.
In a Triwizard fanfiction, you could write about a situation where the Triwizard Tournament is held in a different location other than Hogwarts. Maybe it's held in an ancient wizarding ruin that holds many secrets and dark magic. The champions have to face not only the regular tasks but also the hidden dangers of the new location. Additionally, a plot where the relationships between the champions from different schools develop in unexpected ways, like a romantic relationship between a Beauxbatons champion and a Hogwarts student, could add a new dimension to the story.