Perhaps in this fanfiction, Harry discovers that he has a long - lost twin who has been hidden away by some powerful magic. This would add a whole new layer to his character arc as he tries to find his twin and figure out what role they play in the wizarding world, and also how it relates to the fight against the dark forces.
One interesting plot twist could be that Voldemort is actually being controlled by an even darker force all along. In the original series, Voldemort seems to be the ultimate evil, but in a 'do over' fanfiction, this new revelation would completely change the power dynamics and the goals of the heroes.
One interesting plot twist could be that when Harry travels back in time, he discovers that Voldemort was once an innocent boy who was corrupted by a powerful and dark magical artifact. So instead of just trying to defeat Voldemort as he was in the original timeline, Harry tries to prevent the corruption of that young Tom Riddle.
In some 'Game of Thrones Do Over' fanfictions, Daenerys might form an alliance with the Starks much earlier. Instead of sailing to Westeros alone and facing challenges on her own, she teams up with them. This would create a powerful force against the Lannisters and other enemies, and also change the relationships between the different houses in unexpected ways.
One interesting plot twist could be that the basilisk has an unexpected alliance. Maybe it teams up with a group of outcast magical creatures to take revenge on those who have wronged them. This would completely change the dynamic as in the original, the basilisk is mainly a tool of Voldemort.
In this fanfiction, a great plot twist might be that the gamer's knowledge of game strategies is used to outwit Voldemort in a completely unexpected way. Instead of a traditional magical duel, the gamer uses their understanding of leveling up and collecting power - ups to somehow weaken Voldemort's magic. Maybe they find a way to 'hack' into his dark magic, using skills from the game world that no one in the wizarding world had thought of before.
Well, in some 'Harry Potter and the Prophecy' fanfiction, a plot twist could be that the prophecy was not a prophecy at all but a spell cast by an ancient wizard to set in motion a series of events for a greater purpose. For example, it was to bring about a new era of magic where Muggle - borns and pure - bloods could co - exist peacefully. This would completely change the way the characters view the prophecy and their roles in it. Also, the prophecy might be tied to a different character than Harry or Voldemort, like a minor character who suddenly becomes central to the whole story.
One interesting plot twist could be that instead of Ron leaving and coming back, Hermione actually leaves the group for a while because she discovers a dark secret about her family's past that she needs to figure out on her own. This would add a whole new layer of drama to the story.
One interesting plot twist could be a character who was thought to be a friend actually being in league with the Death Eaters all along. For example, a minor character like Seamus Finnigan could be secretly working for Voldemort, passing information about Harry's movements. This would add a whole new layer of danger and suspicion to the story.
One possible plot twist could be that a beloved character is revealed to be working for the dark side all along. Maybe Hagrid, who seems so kind and trustworthy, is actually under the control of Voldemort and has been secretly passing information. Another could be that the magic in Hogwarts starts to turn against the students, like the staircases leading them into dangerous areas instead of their classrooms. It would add a whole new level of danger and mystery to the story.
One interesting plot twist could be if Harry was sorted into Slytherin instead of Gryffindor. This would completely change his relationships and the way he is perceived in the wizarding world. Another could be if Voldemort had a change of heart early on and decided to abandon his dark ways. It would be a huge shift in the entire story's dynamic.
A cool plot twist might be that the time - turner Hermione uses has some unforeseen side effects. Instead of just allowing her to attend more classes, it starts to create glitches in time that cause different events from the past to bleed into the present. For instance, old spells from the founders of Hogwarts start to randomly appear in the corridors, and the characters have to figure out how to stop this chaos while also dealing with the Sirius Black situation.