One idea could be exploring Dumbledore's early years as a student. Maybe he had a secret friendship or rivalry that shaped his views. Another could be a story where Dumbledore has to face a powerful dark wizard before Voldemort, and how that experience influenced his later actions against the Dark Lord. A third idea is to write about Dumbledore's travels and the magical creatures and cultures he encountered during them, which might have given him insights for Hogwarts' teachings.
A really interesting plot could be that Ariana's spirit is trapped in a limbo of sorts. Harry, with his penchant for getting into extraordinary situations, discovers a way to communicate with her. They then work together to free her spirit. Along the way, Harry learns more about Dumbledore's past through Ariana's memories, which in turn helps him in his own battles against the remaining dark forces in the wizarding world.
One idea could be exploring the backstories of minor characters. For example, the life of Neville's parents before they were tortured by Bellatrix. Another could be a story set in a different wizarding school around the world and how it interacts with Hogwarts. Maybe a story about a group of students from Beauxbatons and their adventures during the Triwizard Tournament that we didn't see in the original books.
One idea could be exploring how Harry copes with the physical and emotional changes. For example, he might struggle with the new limitations his pregnant body has while still trying to be involved in his usual activities like magic training. Another plot could be about the reactions of his friends. Hermione might be super supportive and researching all she can about wizarding pregnancies, while Ron could be initially shocked but then grow to be very protective.
One idea could be that Harry Briggs and Tatum go on an adventure through a magical forest. They discover hidden creatures and have to work together to solve a mystery that the forest holds. Another could be a story where they are in a school setting and form an unlikely friendship that helps them both overcome their personal challenges.
One idea could be Dumbledore misplacing his memories and the students of Hogwarts having to help him retrieve them. It could lead to a series of adventures where they discover secrets about Dumbledore's past that were long forgotten.
A possible plot idea is that the duel is a miscommunication. Dumbledore thinks Harry has been influenced by dark magic, and Harry thinks Dumbledore has turned against him. As they duel, they gradually realize the misunderstanding and work together to find the real source of the problem. Or perhaps it's a time - traveling duel where future - Harry has to duel past - Dumbledore to prevent a dark future.
One idea could be a time - travel plot where Hermione goes back in time and teams up with a young Dumbledore to solve a mystery that has implications for the future of Hogwarts. Another could be a story where Dumbledore entrusts Hermione with a special mission that no one else in the wizarding world can handle due to her unique skills and knowledge. Maybe a plot where Hermione discovers a long - lost spell in the Hogwarts library that was created by Dumbledore in his youth, and she has to figure out how to use it to save the school from a new dark threat.
One idea could be that a character from the Harry Potter world leaps into the body of a Quantum Leap character and has to navigate their life while also trying to find a way back. For example, Harry could leap into Sam Beckett's body during one of his more dangerous leaps and use his magic skills to help Sam complete the mission.
One interesting plot idea could be exploring the alternate timelines more deeply. For example, what if the characters got stuck in a timeline where Voldemort had won? Another could be delving into the relationships between the next generation of characters in ways not fully explored in the original play. Maybe a story where Albus and Scorpius have to face a new dark wizard threat together, relying on their unique bond.
A really cool plot could be that they are both involved in a charity event. Harry is there to perform and Ashley is helping with the organization. They get paired up for a part of the event where they have to interact closely with the fans. During this time, they discover how kind and passionate the other is about helping others. This mutual admiration turns into a deeper relationship as they continue to support the charity together.