Even if you think you know all the tropes, a particularly clever anime can still hit you with a plot twist that you just did not see coming. Sometimes, you look back on a show and realize that the big twist was hinted at, but other times there's no way you could have possibly predicted what the show had in store.
While anime plot twists can be both infuriating and satisfying, they always make a show more interesting. Twists commonly involve a single character or group, but occasionally, a good series will drop in a massive twist that changes everything about the plot. When viewers find out that Assassination Classroom's Koro-Sensei never planned to destroy the Earth, the whole premise of the show suddenly changes. Even if you hated a particular plot twist, it's hard to stop thinking about them once they've dropped.
While today's Naruto fans are comfortably aware of the whole "Itachi is actually a good guy" thing, when the news first dropped, it was utterly shocking.
At the beginning of the series, Sasuke swears to take revenge on his older brother, who he believes is responsible for slaughtering their entire clan. While Itachi actually did do this, he didn't have a choice in the matter. When Itachi was 13, Danzo — a power-hungry Konoha official who secretly wanted to harvest the Uchiha clan's powerful eyes for his own use — approached him with a choice. Itachi could kill his own clan, sparing the life of himself and his brother, or the city would kill them all.
While some argue that Itachi had a third choice (warning his family and getting them out of there), that would have undoubtedly sparked another war. Itachi was already traumatized from years of warfare, and felt that killing his family was the only way to protect his community. Tragically, Sasuke doesn't learn the truth until after he exacts his vengeance and kills his brother.
Attack on Titan drops plot twists from the very start, but the biggest plot twist of all comes when Reiner and Bertholdt — members of the Survey Corps, a group dedicated to destroying Titans — straight up admit to being the Colossal Titan and the Armored Titan. These Titans are horrifying, man-eating monsters who helped kill thousands of humans, including the main character's mother.
What left a lot of viewers particularly shook was the understated way in which this information is revealed. Reiner simply tells Eren the truth with no warning or buildup.
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For many of the characters in Battle Angel Alita, leaving Scrap Iron City for the mythical, wealthy city of Zalem is the ultimate dream. Some characters — like Yugo — want to escape so desperately that they're willing to turn to a life of crime to make the money needed to buy passage there. Because Zalem is so important to so many characters, it comes as a complete shock when the viewer finds out that it's completely impossible to reach the city without having been born there. To achieve his dream, Yugo stoops to stealing and harvesting spines on the black market, but all of his efforts were in vain.
The premise of Assassination Classroom is that class 3-E — a group of middle school students who are constantly looked down on for being "low level"— are tasked with assassinating their teacher, a tentacle monster who claims to have destroyed the moon, and who allegedly has plans to destroy the Earth, unless someone stops him.
In a surprising twist, it turns out that Koro-sensei didn't blow up the moon, and has no intention whatsoever of destroying the Earth. In reality, he intends to die no matter what, because his body is infused with powerful antimatter that will explode and take out most of the planet if nothing is done.
Koro-sensei asked 3-E to try and take him out for two reasons. First off, he wanted to spend his last months on Earth attempting to inspire and care for his friend dead Aguri's students. Secondly, he's genuinely hoping that they'll be able to figure out how to kill him, because he has no desire to destroy the Earth.