One possible plot could be that Harry discovers he has a long - lost relative who was a powerful wizard but had been exiled for some reason. This relative has left behind a set of magical tasks for Harry to complete that will lead him to a new kind of magic that he's never known before. It could involve traveling to far - off magical lands and making new allies.
Maybe Harry discovers a new magic that was long forgotten. For example, he might find a spell book in the Forbidden Forest that leads him on this new path of magic exploration.
There could be a group of rogue Death Eaters who escaped justice and have banded together again. They believe that Voldemort's ideas were right but that he was too weak. So they target Harry, thinking that if they can defeat him, they can finally achieve their goal of a pure - blood - dominated wizarding world. They might be more cunning and less flashy than Voldemort, making them a more difficult enemy to detect.
One possible plot idea could be that the main character in the fanfic decides to leave their old, mundane life behind. For example, if it's a fanfic based on a fantasy world, they might leave their small village to become an adventurer in a big city. They could face challenges like making new friends, learning new skills, and dealing with the politics of the adventuring guilds.
One idea could be a new student arriving at Hogwarts. They could be a muggle - born with a very unique magical ability that even the professors are surprised by. This new character could start making friends with the main characters like Harry, Hermione and Ron, and get involved in some mystery that is starting to unfold in the school.
Perhaps the fanfic is set in a post - apocalyptic world where the main character has to begin a new path of survival. The 'lemon' aspect could be a strange or difficult relationship they form with another survivor. They might have different goals and values at first, causing friction, but as they journey together, they start to understand and rely on each other more.
It could be about Harry's life after the events of the original series, maybe with new magical adventures or challenges.
There could be a new professor at Hogwarts. Maybe a young and brilliant wizard who has just returned from a long journey in a far - away magical land. This professor could bring in new ideas and spells, and become an important figure in Harry's new path.
Perhaps it's about an alternative form of magic that is discovered. This new magic could open up a third path where neither the dark side nor the traditional good side fully controls the future. For example, it could be a magic that focuses on balance and harmony, which changes the way everyone in the wizarding world views power and relationships.
Well, it could be about a new character in the Harry Potter world who has the powers or the role similar to Merlin. Maybe this new character uses magic in a way that combines the traditional Harry Potter magic with the ancient and powerful magic associated with Merlin. For example, they might be able to perform spells that are long forgotten in the wizarding world but were common during Merlin's time.
It could be about Harry starting a new life away from the wizarding world, perhaps in the Muggle world. He might use his magic in secret to help Muggles in need.