One interesting plot twist could be that Voldemort actually has a change of heart. Maybe in the fanfiction, he realizes the futility of his dark ways after seeing the strength of Harry's love and friendship. Another could be that Harry discovers a new, unexpected power within himself that is not related to his typical Gryffindor courage or his connection to Voldemort's soul pieces. For example, he might find he has the ability to manipulate time in a way that gives him an edge in the battle.
In some fanfictions, a plot twist might be that the Hogwarts itself becomes an active participant in the Harry vs Voldemort battle. The castle could use its magic to protect Harry or even to hold Voldemort at bay. Also, there could be a twist where a minor character from Hogwarts, like a house - elf or a rarely - mentioned student, has a hidden power that they use to turn the tide of the battle. It makes the story more exciting as it gives a new perspective and new forces to the well - known battle.
Well, there are fanfictions where the plot twist is that Voldemort and Harry end up having to team up. Perhaps there is an even greater evil emerging that forces them to put aside their differences. This completely changes the dynamic of their relationship. Additionally, some fanfictions might have a twist where Harry is actually transported to an alternate dimension during the battle, and he has to find his way back and face Voldemort in a completely different setting, which adds a whole new layer of complexity to the story.
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