The Tower of London in the fanfiction could be a place where a powerful dark wizard from the past was locked away, and now his spirit is starting to influence the wizarding world again. Harry senses this and decides to investigate. Along the way, he discovers that the Tower has been used as a hiding place for a series of enchanted objects that can be used to either strengthen the dark forces or be used to stop them. Another idea is that there's a secret society within the Tower that has been protecting a prophecy related to Harry and his destiny. The Ministry of Magic wants to get their hands on this prophecy, but Harry has to figure out who to trust within the society to ensure it's used for good.
One plot idea could be that the Tower of London holds a hidden magical artifact that Voldemort is after. Harry and his friends have to race against time to find it first and keep it out of Voldemort's hands. Another could be that a long - lost relative of Harry's was imprisoned in the Tower for practicing magic in the Muggle world ages ago, and now there are secrets related to his family that are locked within its walls. Or perhaps there's a magical beast from the Tower's history that has been awakened and is causing chaos in the wizarding world, and Harry has to deal with it.
One idea could be that the clock tower has a hidden magical portal that only opens at midnight on a certain day every year. And a group of Hogwarts students discover it by accident and have to face the challenges within to save the school from a dark magic threat.
One idea could be that the scarecrow comes to life and becomes a magical creature that helps Harry Potter in a dangerous task. Maybe it has the ability to sense dark magic and warns Harry of approaching threats.
Perhaps Orochi is a hidden figure in the history of the wizarding world that has been forgotten. Harry discovers some old texts in the Hogwarts library that mention Orochi in relation to a long - lost magical artifact. This leads him and his friends on a quest to find the artifact before it falls into the wrong hands, as it has the power to either control Orochi or be used by Orochi to gain ultimate power over the wizarding world.
One plot idea could be that Harry and Angelina team up for a special Quidditch training session for the younger students. They discover a new flying technique together that gives Gryffindor an edge in future matches. Another could be that they go on a secret mission within Hogwarts to uncover a hidden artifact that has been causing strange magical disturbances. And a third idea is that Angelina gets injured during a match and Harry uses some of his unique magical skills, learned from his various adventures, to help her recover faster than normal.
One idea could be a story where a character has a special power to resist Dementors' effects more than others. Maybe they discover a hidden spell or have a unique magical ability that they use to fight off Dementors when others are in danger. For example, a young witch or wizard who can emit a positive energy that counteracts the Dementors' despair.
One idea could be Norberta getting lost in the Forbidden Forest and Harry has to find her. Another could be Norberta growing ill and Harry, with his knowledge of magical creatures, tries to heal her. Maybe Norberta could get into trouble with some other magical creatures and Harry has to step in to protect her.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.
Perhaps in the fanfiction, Snape and Harry are forced to team up to defend Hogwarts against a new, unknown dark force. They have to rely on each other's skills and knowledge, with Snape using his potions expertise and Harry his courage and Gryffindor - like bravado. Along the way, Snape shares some of his own experiences with dark magic and how to combat it, making Harry a more well - rounded wizard.
One idea could be that Tonks discovers a hidden vampire community in the wizarding world while on a mission related to Harry Potter. Maybe the vampires are being wrongly accused of attacking wizards, and Tonks, with Harry's help, tries to uncover the truth.
One idea could be that Harry discovers a new spell that can penetrate Voldemort's dark magic defenses and uses it to shoot him. Another could be that Harry teams up with some unexpected allies, like the house - elves, who help him get in a position to shoot Voldemort. Maybe Harry has to sacrifice something important, like his invisibility cloak, to gain the power needed to fire the shot that will defeat Voldemort.