What are some plot ideas for a Harry Potter new teacher fanfiction?

Perhaps a new teacher who is a half - giant like Hagrid but specializes in Herbology. This teacher could introduce new magical plants from far - off lands. The students would be excited to explore these new species, and there could be some dangerous situations when dealing with these unknown plants, similar to the Devil's Snare incident in the first book.

One interesting plot idea could be that Harry discovers a new magical ability that was hidden from him all along. Maybe he can communicate with magical creatures in a much deeper way, like having full conversations with thestrals.

Maybe in this fanfiction, Harry gets a chance to relive his life at Hogwarts, but with all his memories intact. He uses this knowledge to befriend characters who were previously his enemies, like Draco Malfoy, and together they uncover a long - hidden secret about Hogwarts that changes everything. He might also use his future knowledge to prevent some of the tragedies that occurred in the original series.

One idea could be exploring the wizarding world in a different time period, like the Middle Ages. Wizards could have different magical practices and face different threats. Another could be a story where Harry's children discover a hidden part of Hogwarts that has been locked away for centuries, filled with ancient magic. Maybe also a fanfiction where the roles are reversed, and the Death Eaters are the ones in power, and a group of young witches and wizards rise up against them in a new and unique way.

One idea could be a story where a new teacher at Hogwarts has a special connection with a student who is an outcast. The teacher helps the student discover a hidden magical talent. For example, the student might be really bad at the usual spells but is amazing at an ancient form of magic that the teacher is also interested in.

A really interesting plot could be that Harry, after the defeat of Voldemort, decides to go undercover in the wizarding underworld to root out any remaining dark wizards. He has to change his appearance and assume a new identity. Along the way, he discovers a conspiracy that is much larger than he expected. He also meets some characters who are on the fence between good and evil and has to decide whether to trust them or not. This would be a very thrilling and different kind of story for Harry.

One interesting plot could be the discovery of a new type of magic that was long forgotten in the wizarding world. Maybe it has the power to heal the most incurable dark magic curses.

Perhaps in this fanfiction, the magic in the Harry Potter world starts to fade because of the influence of the 'Brave New World' ideology. Wizards are made to believe that their magic is a form of chaos that needs to be controlled. Harry Potter, being the hero, goes on a quest to find the source of this change and discovers that Voldemort is somehow involved with the people from 'A Brave New World'. He then has to battle not only Voldemort but also the new order that is trying to reshape the wizarding world.

One possible plot could be that the new DADA teacher has a mysterious past related to an ancient dark magic artifact. He or she initially seems friendly but gradually the students start to notice strange behavior. For example, they might find the teacher secretly researching in the Forbidden Forest at night. This could lead to the students, especially Harry and his friends, trying to uncover the truth about the teacher and in the process, they discover a plot to bring back an old dark wizard.

One idea could be that a Hogwarts student runs away and ends up in New Orleans. The NCIS agents then have to figure out what to do with this strange kid who has magical powers. Another could be that a dark wizard from the 'Harry Potter' world is causing trouble in New Orleans, and the NCIS team has to team up with some friendly wizards to stop him.