Perhaps a fanfiction where Barty, after being exposed, somehow has a chance at redemption and forms an unlikely alliance with Harry to fight a greater evil that threatens the wizarding world. They could learn from each other's strengths and weaknesses. For example, Harry's pure heart could influence Barty to turn away from his dark past.
A plot could involve a time - travel scenario where Harry goes back in time and meets a younger Barty. Harry tries to prevent Barty from going down the dark path he eventually takes. This would create a lot of tension and interesting character interactions as Harry has to navigate the wizarding world of the past while trying to change Barty's future.
Another plot could be a time - travel fanfiction. Harry and Barty Crouch Jr. are sent back in time to a crucial point in wizarding history. They have to work together, despite their differences, to fix something that went wrong in the past. This would force them to understand each other better and perhaps even form an unlikely friendship.
Well, one interesting plot might be a time - travel fanfiction. Barty Crouch Jr goes back in time to prevent himself from ever getting involved with Voldemort. This could lead to a whole different series of events in the Harry Potter universe. Maybe he ends up becoming a key figure in fighting against the Dark Arts in a more positive way. He could also have an adventure where he teams up with other characters who were previously his enemies in the original timeline, like the Aurors, to take down some new dark threat.
Perhaps a time - travel plot where Hermione goes back in time and somehow crosses paths with a younger Barty Crouch Jr. She tries to prevent him from going down the dark path he eventually takes in the original story. It would be full of moral dilemmas and interesting character interactions.
Well, it could be about Harry and Barty getting to know each other through a shared interest in magical creatures. Maybe they meet in the Forbidden Forest while Harry is on detention and Barty is secretly researching a rare creature there.
Maybe Harry is the only merman in a world where mermaids are common. He faces discrimination at first but then uses his unique abilities to save the underwater kingdom from a great danger. For example, he might have a special power to purify poisoned waters that the mermaids don't have.
One idea could be that Harry Potter is magically transported to the Avengers' universe. He could use his magic to help the Avengers in battles, like creating protective shields with spells. Another idea is that the Avengers are somehow sent to Hogwarts, and they have to learn about magic while also dealing with threats in the wizarding world. For example, Iron Man might try to figure out how to integrate his technology with magic.
Another plot could be set in an alternate universe where Nagini has a different origin. Maybe she was an ordinary snake that was experimented on by dark wizards, and Harry stumbles upon her during his travels. He then decides to help her break free from the dark magic that binds her, and in the process, they form an unlikely bond. This bond could then be tested as they face various threats from both the wizarding world and those who want to use Nagini for their own evil purposes.
Perhaps they form a secret club within Hogwarts where they plan elaborate pranks on the Slytherins. This could involve using their combined knowledge of magic and mischief to outwit their rivals in really creative ways. They might also end up uncovering some dark secrets about the Slytherin common room in the process.
One idea could be a story where Harry discovers a hidden spellbook that once belonged to Lupin's family. With Lupin's help, he tries to decipher the spells inside and in the process, they unearth a long - forgotten mystery about Hogwarts.
Another plot could be a time - travel scenario. Harry goes back in time and tries to understand his early years with the Dursleys better. He might try to change some of the negative interactions and make them more positive, like showing Dudley that there's more to life than bullying.