One idea could be a new dark wizard threat that forces the characters from different houses to form an even stronger alliance than before. They might have to combine unique spells and strategies that each house is known for.
Perhaps an ancient magical artifact is discovered that has the power to either save or destroy the wizarding world. The great alliance then has to embark on a quest to either protect or destroy it. In this journey, they face various challenges like magical creatures and dark spells, and they have to rely on each other's strengths, for example, Gryffindors' courage, Ravenclaws' intelligence, Hufflepuffs' loyalty, and Slytherins' cunning.
One idea could be that Harry and Neville form an alliance to secretly train students in advanced defensive magic outside of Umbridge's notice during her reign at Hogwarts. They could use the Room of Requirement as their base.
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.
One interesting plotline could be about the different wizarding families uniting to face a new dark threat that the Ministry of Magic is unable or unwilling to handle. For example, the Weasleys, Potters, and Lovegoods might form a more official alliance to combat a group secretly spreading dark magic artifacts. This could involve lots of intrigue as they try to figure out who is behind it while also dealing with their own family dramas.
A traveler could be from a different magical realm entirely and come to the Harry Potter universe. They bring with them unique magical abilities that both fascinate and frighten the wizards in the Harry Potter world. This could lead to a series of adventures where they either share their knowledge or are hunted down by those who fear the new magic they possess.
One idea could be that Hecate, being the goddess of magic, takes Harry Potter under her wing secretly to teach him ancient and powerful magic that Dumbledore doesn't know. This could lead to Harry having new abilities to fight Voldemort.
A possible plot in Harry Potter Planeswalker fanfiction is that a Planeswalker accidentally brings a dangerous creature from another plane into the Hogwarts grounds. This causes chaos as the teachers and students have to figure out how to deal with it. It could also be that a Planeswalker has a special connection to the magic in the Harry Potter world, like being able to sense the presence of magic in a way that wizards can't. They could use this ability to discover hidden secrets about Hogwarts or the wizarding families. Maybe a Planeswalker is on a quest in the multiverse and the Harry Potter world is just one stop on their journey, and their actions in the wizarding world have consequences for their overall mission.
One interesting plot could be a time - travel story in the Harry Potter wonderland. For example, a character goes back in time to the Marauders' era and gets involved in their adventures, while also trying to prevent a future disaster in the wizarding world. Another idea is a story where a new, powerful magic is discovered in the wonderland, and Harry and his friends have to figure out how to control it before it falls into the wrong hands. A third plot could be about an alternate reality where Voldemort won the war, and the remaining good characters have to find a way to reverse the situation in the harry potter wonderland.
One plot idea could be that Bella discovers she has a hidden magical ability that only Harry can help her understand and control. Maybe it has something to do with an ancient magic that's connected to Harry's destiny.
One interesting plot idea could be a fanfiction where the magic system in Harry Potter is reversed. Instead of wands being the main tool for magic, it's potions that can directly create magical effects without the need for incantations. Another could be a story where characters from different houses have to team up to solve a mystery that involves a new, never - before - seen type of magic that is slowly corrupting Hogwarts. And there could also be a fanfic where a Muggle - born discovers a way to use modern technology in combination with magic, creating a whole new form of spell - casting.
One idea could be that Hippolyta, with her Amazonian knowledge and powers, comes to Hogwarts as a visiting instructor. She could teach the students about ancient magic that has been lost in the wizarding world but is still known in her realm. Harry Potter, being the curious and brave hero, would be eager to learn from her, and they could form a bond over their shared love for magic.