A plot could be that Harry and Hermione are looking for a way to bring back some of the lost memories of the students who were affected by a powerful forgetfulness charm during a battle. In the Room of Requirement, they find a magical device that can restore memories, but they have to go on a quest within the room to find the power source to activate it. Another idea is that they use the room to train for a magical tournament that's different from the Triwizard Tournament. They face all kinds of magical challenges created by the room itself, and in the process, they grow closer as friends and develop their magical skills even further.
One idea could be that a group of students discover a hidden section within the Room of Requirement that has a time - travel portal. They then have to decide whether to use it to change certain events in the wizarding world's history. Another could be that the Room of Requirement creates a magical garden full of plants that can talk and offer wisdom. And a third idea might be that the room turns into a training ground for a new and dangerous form of magic that the students have to master to save Hogwarts from a new threat.
In some fanfictions, the Room of Requirement becomes a place for character development. For Draco, Hermione, and Harry, it could be a space where they confront their prejudices. Hermione might use the room's magic to show Draco the error of his ways, while Harry tries to find a middle ground. It's an interesting concept that often plays out in different ways in various fanfictions.
One interesting plot could be that Draco and Hermione are forced to work together in the Room of Requirement on a secret project to save Hogwarts from a new dark threat. They start off hating each other but gradually come to respect and even like one another as they discover each other's strengths.
One interesting plotline could be Hermione and Draco being forced to work together in the Room of Requirement for some school project or task assigned by a teacher. They start off hating each other but gradually come to understand and respect one another as they discover each other's strengths and insecurities within the ever - changing room.
One interesting plotline could be Harry and Ginny using the Room of Requirement to hide from Death Eaters during the final battle. They find secret passages and ancient spells within the room that help them in their fight. Another could be them using the room for romantic getaways, away from the prying eyes of Hogwarts students and teachers, where they share their deepest secrets and feelings.
One interesting plotline could be about a character using the Room of Requirement to hide a powerful and dangerous magical artifact that was thought to be lost. The protagonist has to keep it a secret from both the good and bad wizards while trying to figure out what to do with it. Another could be students using the room to create a secret study group for a very advanced and restricted area of magic, and they have to avoid getting caught by the professors. And a third plotline might be about a character who accidentally discovers a hidden passage in the Room of Requirement that leads to an unknown part of Hogwarts filled with ancient magic and mysteries.
Another interesting plot is that the Room of Requirement is the key to saving Hogwarts from a new, unseen enemy. Harry, Hermione, and Draco are the only ones who can access the room's true power. Inside, they find a prophecy that predicts the downfall of the wizarding world. They then embark on a journey within the room, which is like a maze filled with different magical landscapes. They must use their wits and magic to find a way to stop the impending doom.
A possible plot for a Harry Potter shower room fanfiction could be that the shower room is haunted by the ghost of a former student who was wronged in that very place. Harry, being the brave one, decides to communicate with the ghost and find out what happened to help it move on. Another idea is that the shower room's water has some special magical properties that start affecting the students' magical abilities in unexpected ways. For example, it makes Neville suddenly able to perform advanced herbology - related spells. And a third idea is that the Marauders once hid a prank - related map in the shower room that Harry discovers, and it leads him on a wild adventure around Hogwarts.
A third plot could be that their presence in Ravenclaw changes the overall perception of the house. Usually seen as more cerebral and less action - oriented, Harry and Hermione bring a sense of adventure. They might convince their Ravenclaw housemates to join them in more dangerous quests, like exploring the Forbidden Forest for a rare ingredient for a potion that could help in the fight against the Dark Arts.
One plot idea could be that Harry, Hermione and Susan team up to solve a new mystery at Hogwarts that the teachers are overlooking. For example, a series of strange disappearances of magical creatures from the Forbidden Forest. They use their combined skills in magic, Hermione's research abilities, Harry's courage and Susan's unique knowledge of certain spells to track down what's happening.