What are some interesting plot ideas in 'Harry Potter water magic fanfiction'?

One idea could be a fanfiction where a new student arrives at Hogwarts with a unique star - based magic. Maybe they can use constellations to cast spells. For example, they draw the shape of Orion in the air to create a protective shield.

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.

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.

One idea could be a forgotten ancient battle magic spell being rediscovered during a dangerous time at Hogwarts. Maybe a student stumbles upon it in an old, dusty tome in the restricted section of the library.

One interesting plot idea could be a crossover where the Phoenix Slayer magic is introduced into the Harry Potter world and a character has to learn this new form of magic to defeat a dark wizard. Maybe the Phoenix Slayer magic can control the power of phoenixes in a different way than what is known in the original Potterverse.