What are some interesting plotlines in 'Harry Potter in the past fanfiction'?

A common plotline is the characters' post - graduation plans. Some fanfictions might explore how Harry, Hermione, and Ron decide on their career paths. Maybe Harry is conflicted between becoming an Auror or a teacher at Hogwarts. Hermione could be considering further studies in ancient magic, and Ron might be thinking about joining his brothers in the joke shop business. This exploration of their future dreams and how they support each other during this transition period can be really engaging.

One possible plotline could be that Harry is wrongly expelled due to false accusations by a dark wizard who has infiltrated Hogwarts. Harry then has to prove his innocence while on the run from the Ministry. Another plotline might involve Harry being expelled because of a new, strict and unjust headmaster who has a vendetta against him. He could then start his own school for outcast witches and wizards.

Perhaps the snake is a transformed wizard who was cursed. This would lead to a plot where Harry has to find a way to break the curse. He might have to go on a quest to find rare ingredients for a potion. Along the way, he and the snake face various challenges, like dark wizards trying to stop them, and they form a strong friendship through their shared experiences.

One interesting plotline could be where Harry discovers a hidden magic that was lost for centuries. This new magic gives him unique abilities and he has to figure out how to use it without Voldemort finding out. It could change the whole dynamic of the fight against the Dark Lord.

One interesting plotline could be a massive wizarding battleship battle where Hogwarts students and Death Eaters engage in a sea - based fight. The battleship could be enchanted with all sorts of magic, like shields made of Patronus charms.

Another plotline could involve a character jumping into different points in the Harry Potter timeline. They could interact with characters at different ages, like meeting a young Dumbledore and influencing his early views on magic. This would create a whole new set of relationships and story developments. Also, there could be a plot where a character uses the jumpchain to enter the world of Harry Potter from a completely different fictional universe, bringing with them their own set of skills and knowledge which then disrupts or enriches the magical world as we know it.

One interesting plotline could be how Harry's Veela heritage affects his relationships. For example, it might make his interactions with Hermione and Ron more complex as they deal with this new aspect of him. Another could be how his Veela side influences his magical abilities, perhaps giving him an edge in certain spells or magical duels.

One interesting plotline could be Harry having god - like powers and using them to change the wizarding world for the better. For example, he might be able to instantly end all forms of dark magic or create a utopia for magical creatures.

One interesting plotline could be an alternate take on the formation of Dumbledore's Army. Maybe in the fanfiction, they face different challenges during their secret meetings, like dealing with a new type of dark magic that the books didn't mention. Another could be a deeper exploration of Harry's connection to the Phoenix. For example, he discovers some hidden powers related to the Phoenix that help him in the fight against Voldemort in a more unique way.

One interesting plotline could be a goblin uprising in the wizarding world. They might feel oppressed by wizard laws and decide to fight for more rights. Another could be a goblin - Harry Potter alliance. Maybe Harry discovers that the goblins have a secret that can help him defeat Voldemort and they team up. Or perhaps a story where a goblin character befriends Harry and shows him a whole new side of the wizarding economy that is controlled by the goblins.