In the 'harry potter after hogwarts fanfic', a really interesting plot could be about the discovery of new magical creatures or lost spells. Harry, being the adventurous type, might go on quests to explore these new elements. He could also get involved in international wizarding relations, using his fame and experience to bridge gaps between different wizarding communities around the world. This would open up a whole new world of magic for the readers to explore.
Well, a plotline might revolve around the new relationships that form. For example, Neville could start a herbology club and meet a new love interest who is also passionate about plants. Also, the wizarding world might see some political changes. Maybe there would be a new Ministry of Magic with more inclusive policies after the dark times of Voldemort's regime.
One possible plotline could be Harry coming to power after a great war in the wizarding world. He then has to deal with rebuilding and unifying the different wizarding communities under his rule as emperor. He might face resistance from some traditional wizarding families who don't want to accept a new form of government.
In a 'Harry Potter is an assassin' fanfic, the plot could start with Harry being trained by an unknown and powerful wizard who has his own motives for creating an assassin out of Harry. This trainer could be someone from a far - off land or an ancient order. Harry then starts taking on targets within the wizarding world that are supposedly 'evil' but as he delves deeper, he realizes that things are not as black and white as he was told. His friends start to notice his strange behavior and he has to either come clean or keep lying to them. As the story progresses, Harry might have to make some tough choices between his loyalty to his friends and his new - found assassin duties, all while uncovering secrets about the wizarding world that were previously hidden.
One possible reason could be that he feels constantly in danger at Hogwarts. With all the dark magic threats and attacks that keep happening, he might think leaving would keep his friends and himself safer. For example, after the Chamber of Secrets incident, he might have considered leaving to protect others from Voldemort's influence.
One possible reason could be misinformation spread by the Ministry of Magic. They might have spread false rumors about Harry being a threat, which influenced the Hogwarts community. For example, if the Daily Prophet printed false stories about Harry's supposed dark magic activities, it could turn some students and staff against him.
One plotline could be Harry renovating Hogwarts. He might discover hidden rooms or passages and use his newfound power to make the school safer or more inclusive for all students.
One possible plotline could be that Harry, traumatized by the events related to Azakaban, decides to leave Britain to find a new start. He might travel to other wizarding communities in Europe, like in France. There, he could discover new magical creatures and spells that are not well - known in Britain. He may also meet other witches and wizards who have different views on magic compared to his British counterparts, which could lead to his personal growth and a change in his understanding of the wizarding world.
In many fanfics, Harry Potter might become an Auror after Hogwarts, using his skills to fight dark magic. He could also start a family with Ginny and raise their children in a world that's gradually recovering from the war.
One possible plotline could be that some dark magic has been cast on the Hogwarts Express and students start to find themselves in strange bondage - like situations, where they are restricted in their movements but have to figure out how to break free using their magic skills and knowledge. Another could be a more prank - based scenario where a group of students accidentally cast a spell that creates a bondage - like effect during their journey on the Hogwarts Express and they have to reverse it before the teachers find out.
Another plotline could involve a group of Death Eaters who are missing in action but are actually planning a huge comeback. They could be secretly gathering forces and creating new dark magic artifacts. The story could follow a young Auror who discovers their plot and tries to stop them before they unleash chaos on the wizarding world.