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.
A plotline could be that there is a new security measure on the Hogwarts Express in the form of a magical bondage spell that is malfunctioning. Harry Potter and his friends notice that some students are getting trapped in their seats or unable to move freely. They suspect it has something to do with the new security system put in place by the school. So, they start to investigate. Along the way, they learn about the origin of the spell, how it was supposed to work, and eventually find a way to fix it, all while having adventures and facing challenges on the Hogwarts Express.
Well, perhaps there's a mystery object on the Hogwarts Express that when touched, it binds the person who touches it. Harry Potter could be the one to discover this. He then has to work with his friends to figure out how to remove the binding magic. It might involve researching in the books they have with them or trying different spells they've learned at Hogwarts. Maybe they'll also have to enlist the help of some of the train staff or older students who might know more about this strange magic.
Maybe a jealous student from Slytherin who wants to get back at Harry Potter and his friends. This student discovers a dark and forbidden spell that creates a bondage effect. They start using it on the Hogwarts Express to cause chaos and make Harry and his friends look bad. They see themselves as an antagonist because they feel wronged by Harry and his group in some way, and this is their way of getting revenge.
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.
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 plotline could be that this non - Hogwarts headmaster comes to Hogwarts on an exchange program. They bring their own unique magical curriculum and start to change the way students think about magic. There could be conflict with the traditional Hogwarts professors who are resistant to change.
In 'Harry Potter and the Legacy of Hogwarts Fanfic', a possible plotline is the exploration of the Forbidden Forest in more depth. The main characters might discover new magical creatures that were previously unknown or thought to be extinct. There could also be a plotline about a magical disease that starts to spread among the students and teachers, and they have to find a cure using their knowledge of magic. Another interesting plotline could be about a secret society within Hogwarts that has been operating for centuries and the main characters get involved in it, uncovering its true purpose and history.
One possible plotline could be students trying to figure out the cause of the lockdown while also dealing with their own personal issues. For example, Harry might be worried about Voldemort still being a threat even within the locked - down Hogwarts. Another could be the formation of secret groups among students to find ways to break the lockdown rules in order to get supplies or communicate with the outside world. Maybe Hermione would be part of a group that tries to use magic in innovative ways to bypass the lockdown restrictions.
A plotline might involve Harry being reincarnated as Smaug in a parallel universe. As Smaug, he remembers his past life as Harry and tries to use his knowledge of magic to rule over the lands in a more benevolent way than the original Smaug. Or perhaps there is a prophecy that states only a wizard - turned - dragon can save both the wizarding world and Middle - earth from a great evil, and Harry is the chosen one to become Smaug.
One possible plotline could be that Harry Potter sacrifices himself to defeat an even more powerful dark wizard than Voldemort. Maybe this new enemy has a power that can only be countered by Harry's self - sacrifice, which would lead to a very bittersweet ending for the wizarding world.
One possible plotline could be Harry and his friends are forced to undergo military training to defend Hogwarts from a new dark threat. They learn combat spells and strategies.
Perhaps there's a plot where Snape is framed for a crime he didn't commit, and Hermione is the only one who believes in his innocence. She sets out to prove his innocence by investigating the real culprit. Along the way, they have to work together, hiding from the Ministry of Magic and other dark forces. Snape starts to see Hermione in a new light, and Hermione gains a deeper understanding of Snape's character and the politics within the wizarding world.