Perhaps Asriel and Harry meet in a parallel dimension where the rules of magic are a bit different. They start sharing their knowledge of magic and powers. Asriel teaches Harry about his world's magic, and Harry shows Asriel some of the more unique spells in the wizarding world. Together, they use this combined knowledge to break free from this dimension and return to their respective worlds, but not before making some changes to prevent future threats.
One idea could be that Asriel, with his unique powers, somehow ends up in the wizarding world of Harry Potter. He could team up with Harry to fight against a new dark force that is a combination of the threats from both their universes. Maybe they have to face a powerful wizard who has also acquired some of the dark powers that Asriel once had.
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.
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.
One idea could be to explore what happens after Harry Potter's kids start at Hogwarts. Maybe there's a new dark force emerging that the new generation has to face, with a twist that it's related to an old, forgotten spell. Another could be to focus on a character who was always in the background in the original series, like Neville Longbottom's further adventures as a Hogwarts professor, teaching a new and dangerous subject.
One idea could be exploring the backstory of the Serpensortia spell. Maybe the fanfiction could focus on a character who discovers an ancient book that details the true origin and hidden powers of the spell. This could lead to a whole adventure as they try to keep this knowledge from falling into the wrong hands at Hogwarts.