Perhaps in a fanfiction, the Minister of Magic is under the influence of a powerful dark charm, and Harry Potter has to find a way to break it without causing chaos in the wizarding world. He might have to team up with unlikely allies from different houses at Hogwarts. This could involve a lot of character development and exploration of the relationships between different wizarding factions.
A great plot could be that the Minister of Magic decides to hold a tournament similar to the Triwizard Tournament, but with a new set of rules. Harry Potter is forced to participate against his will. Along the way, he discovers that the real purpose of the tournament is to select a new magical guardian for a powerful and ancient magical artifact. Harry has to fight not only his opponents but also the mystery surrounding the artifact.
Perhaps the Muggle Prime Minister is accidentally affected by a spell that makes him see magical creatures everywhere. He then has to deal with the chaos while also trying to keep it a secret from the public. He might start to question his own sanity until a wizard comes to his aid.
One possible plot could be Harry using his unique experiences to reform the Ministry. He might start by getting rid of any remaining Death Eater sympathizers in the Ministry. He could also focus on improving the education system for young wizards and witches, perhaps by introducing more practical and ethical magic teachings. And he would surely strengthen the Ministry's defenses against the Dark Arts, having faced Voldemort himself.
One idea could be a wizard using card magic to solve a mystery at Hogwarts. Maybe the cards hold clues that only the protagonist can decipher through their knowledge of card magic.
One idea could be a story where a young witch or wizard discovers a hidden, powerful spell within the Ministry's archives that was long forgotten. This spell could have the potential to either save or destroy the wizarding world, and they must decide what to do with it.
Another plot could focus on how the family magic affects relationships. Maybe Harry uses family magic to strengthen his bond with his children in a way that normal magic can't. He could teach them unique family spells that help them understand their heritage better.
Well, in some fanfictions within 'harry potter and the foreign magic fanfiction', there might be a plot where a foreign wizard or witch comes to Hogwarts and brings their unique form of magic. This could lead to new friendships and rivalries. They might introduce a different way of brewing potions or casting charms that challenges the existing knowledge of the Hogwarts students. It could also be about a foreign magical artifact that holds great power and the characters have to figure out how to use it or keep it safe from the wrong hands.
Another plot idea could be that Harry, as a master of magic, has to go back in time to correct some mistakes in the past that are now causing problems in the present. This would involve him facing his younger self and trying to guide his actions without disrupting the timeline too much. He would need to use his advanced magical skills to avoid detection and make the necessary changes.
One idea could be a story where a new character discovers a hidden water magic spell in the Forbidden Forest. This spell has the power to create sentient water creatures that can help protect Hogwarts. Another could be about a group of students using water magic to uncover a long - lost underwater chamber in the Black Lake filled with ancient magical artifacts.
Another plot could involve Harry being reincarnated as a different character in the wizarding world. This would give a whole new perspective on the relationships and power dynamics. He could be a Squib who suddenly discovers latent magic within himself in a very different way than before.
One idea could be a story where a new student arrives at Hogwarts with a unique ability to control wind magic in ways not seen before. This student could use their wind magic to help the Gryffindor Quidditch team gain an edge in a crucial match, for example, by creating strong gusts to disrupt the opposing team's players or guiding the Golden Snitch in a particular direction.