A great plot could be about an Obscurial who teams up with Harry Potter to fight against a new dark force in the wizarding world. The Obscurial's unique and often uncontrollable magic could be a powerful asset but also a liability in their battles.
One idea could be exploring the backstory of an Obscurial who was hidden within Hogwarts all along. Maybe they were a Muggle - born who was constantly bullied and their magic turned into an Obscurial out of fear and repression.
Some fanfictions focus on the training of an Obscurial. They might show how a skilled wizard or witch tries to teach an Obscurial to master their powers without suppressing them completely. This often involves a lot of emotional and mental training as well, as the Obscurial's power is closely tied to their emotions. It can make for a really interesting character arc within the fanfiction.
One interesting aspect could be the exploration of the Obscurial concept in a fan - created context. It might show different interpretations of how an Obscurial's power and nature could be developed further than in the original series.
Well, one possible plot development could be that Harry has to hide his new status as an Obscurial from his friends at Hogwarts for fear of being ostracized or worse. Another could be that Voldemort somehow discovers Harry's new condition and tries to use it to his advantage, perhaps by trying to manipulate the Obscurial power within Harry. Maybe Harry has to learn to control this new, dangerous power on his own as he can't trust Dumbledore or the other teachers with this secret at first.
If Harry Potter becomes an obscurial in fanfiction, the story could take a very different turn. He might not be as eager to attend Hogwarts as he was originally. The Dursleys might have an even worse time with him because his obscurial powers could lash out. At Hogwarts, teachers would be extremely concerned. Snape, for instance, might be even more critical of him, seeing him as a potential danger. And Harry would have to learn to control this new and dangerous aspect of himself.
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.
The mystery around obscurials. In the Harry Potter canon, they are not fully explored, so fanfics can fill in those gaps. They allow us to imagine what it's like for a person with such a powerful and dangerous hidden magic.
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.