One interesting concept could be a world where Voldemort won the war. In this alternate universe, Hogwarts might be a very different place, with dark magic being taught openly. Another concept could be a universe where the houses are not divided as they are in the original. Maybe students are grouped based on different criteria like magical talents other than just bravery, intelligence, etc. For example, there could be a group for those who are good at magical creatures handling.
Severus Snape is a fan favorite in alternate universe stories. People are interested in seeing his character developed further, perhaps in a world where he didn't have such a complex relationship with Lily Potter. Harry Potter himself is, of course, a popular choice. Fanfic writers might create scenarios where Harry discovers his magic much earlier or has different adventures outside of Hogwarts that change his character development.
Well, Hermione is often depicted in different ways in these fanfics. In some alternate universes, she could be a powerful dark witch instead of the studious and good - hearted character we know. Ron might be a super - confident and arrogant character rather than the sometimes insecure boy in the original story. Also, Snape could be a completely different person. He could be a jolly and friendly teacher rather than the brooding and complex one we are used to.
In some 'Harry Potter travels to alternate universe fanfic' plotlines, Harry might find that his parents are alive in the alternate universe. This would be a huge emotional rollercoaster for him. He would have to deal with the fact that he has a different family dynamic, and also figure out how this affects the fight against evil. Additionally, the alternate Hogwarts could have different teachers or even different subjects. This would open up a whole new world of exploration for Harry.
A Hufflepuff prefect could be the main character. They are responsible for maintaining order within the house and could be caught in the middle of a power struggle between the different houses in this alternate universe. They would have to use their Hufflepuff traits to resolve conflicts and keep the peace in Hogwarts.
One great 'alternate universe Harry Potter fanfiction' is 'The Life and Times of Severus Snape'. It delves deep into Snape's character in an alternate setting. It shows a different side of Hogwarts and the wizarding world through his eyes. Another one is 'A Different Sort of Magic' which changes the magic system in an interesting way. The characters have to adapt to new rules of magic, creating a fresh and engaging story.
One idea could be that in this alternate universe, Hufflepuff is the dominant house in Hogwarts. They have a secret society within the house that holds the key to an ancient magic that can save the wizarding world from a new, unknown threat. And the main character, a Hufflepuff student, discovers this by accident and has to take on the responsibility to gather the members of the society.
Well, 'The Veil's Echo' is a top - notch alternate universe fanfiction. In this story, the Veil in the Department of Mysteries has some unforeseen consequences that send Harry and his friends into a parallel wizarding world. It's full of mystery and adventure. 'A World Without Voldemort' is another great one. As the title suggests, Voldemort was never born, and the wizarding world has developed in a completely different direction. There are new political struggles and different character dynamics. Also, 'The Animagus Potter' is cool. Harry discovers he has an animagus form much earlier and it changes how he interacts with others at Hogwarts.
There are quite a few good 'Harry Potter Alternate Universe Travel Fanfiction' out there. For example, 'The Lost in Alternate Potter Worlds' story is about a group of students who get lost in different alternate versions of the wizarding world. They have to find their way back while facing all sorts of strange challenges and new magical creatures. Another one is 'When Harry Traveled to the Alternate Hogwarts'. In this one, Harry, on his own, travels to an alternate Hogwarts where things are very different. The relationships between the characters are changed, and there are new secrets to uncover. 'The Other - Side Potter Universe' is also a fascinating fanfiction. It shows an alternate universe where the war between good and evil took a completely different turn, and the characters have to deal with the consequences of that different history.
One interesting AU could be a world where the Triwizard Tournament is open to all years. This would change the dynamic completely as younger students might participate, bringing in different skills and strategies. Another could be an AU where Voldemort never came back in the fourth year, and instead, a new dark wizard rises to power in Hogwarts, creating a different kind of threat for Harry and his friends. A third concept could be an AU where the Hogwarts houses are mixed up for the fourth - year students, forcing them to work with those they usually wouldn't and leading to unexpected friendships and rivalries.