Another is 'The Sixth Sense'. Although it's a movie adaptation, the novel has the same great twist. The fact that the main character can see dead people, and the final revelation about his own situation is a huge and unexpected twist.
In horror stories, a great plot twist can be the sudden change in the nature of the threat. For example, a werewolf that the characters have been fighting against suddenly reveals that it can transform into other forms or has a different power that they were unaware of. Another plot twist is when the origin of the horror is completely different from what was expected. Instead of it being a supernatural entity from local folklore, it could be a scientific experiment gone wrong that has created a new type of monster. Also, a plot twist where the characters' own actions are what bring about the worst of the horror. They might think they are doing the right thing to stop the horror, but their actions actually make it stronger or more widespread.
One great plot twist could be that Hermione is actually an undercover Auror in a world where the Ministry is corrupt. She has to pretend to be on their side while secretly gathering evidence against them. This adds a layer of mystery and danger to the story.
One great plot twist could be that Itachi was actually working undercover all along to protect Naruto, not just for the sake of the village. In the original story, Itachi's actions were always a bit of a mystery. In the fanfiction, this could be revealed in a way that changes Naruto's perception of him completely.
One interesting plot twist could be a character who was thought to be dead actually returns as a powerful force. For example, in some fanfictions, Ned Stark might come back with new knowledge or powers.
One more from the list could be 'The Great Gatsby'. It shows the decadence and hollowness of the American Dream in the 1920s through the story of Jay Gatsby and his unrequited love for Daisy Buchanan. It has beautiful prose and complex characters.
In 'Rebecca' by Daphne du Maurier, there are some great plot twists. The mystery surrounding the first Mrs. de Winter and how it all plays out is full of surprises. 'The Girl on the Train' also has a good plot twist. As the story progresses, the reader discovers that things are not as they initially seemed, especially regarding the main character's perception of events. 'The Prestige' by Christopher Priest has a complex and amazing plot twist that involves the nature of the two magicians' rivalry and the secrets behind their tricks.
One interesting plot twist could be that some of the dead ninjas from previous wars come back not as enemies but as allies with a secret mission to end the cycle of hatred. They might have gained new powers or knowledge in the afterlife that can turn the tide of the Fourth Great Ninja War.
In 'Gone Girl', the sudden revelation about Amy's true nature and her elaborate plan is a great twist. The story leads you to believe one thing, and then it flips everything on its head. It shows how unreliable the narrators can be and keeps the readers on their toes throughout the whole novel.
A really good 2015 novel is 'A Little Life' by Hanya Yanagihara. It's a long and complex story about friendship, trauma, and the human condition. It follows the lives of four friends in New York City over several decades, delving deep into their personal struggles and how they support and sometimes fail each other. The characters are very well - developed and the writing is quite powerful, making it a memorable read.
There was 'Circe' by Madeline Miller. This novel reimagines the story of the Greek mythological figure Circe. It's a beautifully written exploration of power, femininity, and the role of the outcast in a mythological world.