Anime has always been a vibrant canvas for unexpected twists and gut-wrenching moments. Just when you think you have it all figured out, the story takes a different turn, leaving you unsure of how to cope with what just happened. Some of these moments have completely redefined the arcs of the characters involved, leaving us with a bittersweet feeling.
Uchiha Itachi: A Hero in the Shadows – Naruto Shippuden

From the very beginning, Itachi Uchiha was portrayed as a villainous assassin, having murdered his entire clan under mysterious circumstances. For years, Sasuke lived only to avenge his brother. However, when the truth was finally revealed, we discovered that everything we believed to be true was, in fact, a tragic misunderstanding.
Itachi was not merely a character representing evil; he was a hero who sacrificed his happiness, honor, and very life to protect Konoha and his younger brother.
Eren Jaeger: From Hero to Villain – Attack on Titan

At the start of Attack on Titan, Eren is the quintessential hero who always seeks revenge. However, with each new revelation, his worldview becomes increasingly distorted until he makes some of the most shocking decisions in anime history. Instead of following the path of a typical hero, he chooses a unique route that leads to the near extinction of humanity.
The most heartbreaking part is that the ones he once fought alongside, his childhood friends, become the only people who can stop him. A twisted turn of events finds us questioning whether Eren is a monster or merely someone lost on a quest for freedom.
Kira Knows L’s Name – Death Note

Everyone knows that L’s fate is linked to Kira. He is the only one capable of challenging Light, but ultimately, he meets his end under tragic circumstances. Due to his overconfidence, Light uses Misa and Rem to orchestrate L’s demise. In a blink of an eye, L falls, defeated, while Light revels in his victory.
The narrative never quite recovers from that moment. For many, Death Note lost a significant part of its allure when L died.
Aizen’s Masterplan – Bleach

If there is anyone who embodies perfection in Bleach, it is Aizen. Throughout much of the story, he acts as a seemingly benevolent force… until it’s revealed that he has been manipulating everyone all along. Aizen’s carefully crafted schemes lead to chaos in Soul Society, all orchestrated by him.
From the betrayal of Orihime to the creation of Hōgyoku, nothing was left to chance. Aizen is not just one of the strongest characters; he is also one of the most cunning and unpredictable figures.
Gon’s Sacrifice – Hunter x Hunter

Gon has always been an optimistic and energetic character. However, when he discovers that Kaito has died, something inside him shatters completely. In his despair, Gon decides to sacrifice his future self to gain immense power for revenge.
In an instant, he transforms from an innocent child into a powerful being, but at the cost of losing his own essence. The moment we see Gon, once full of light, completely consumed by darkness, marks a devastating point in Hunter x Hunter.
The Horror of Nina and Alexander – Fullmetal Alchemist: Brotherhood

There is one scene in Fullmetal Alchemist that continually haunts viewers, and that is the fate of Nina. Shou Tucker, the “loving” father and alchemist, decides to merge his daughter with their dog, Alexander, to create a chimera, all in a bid to avoid losing his alchemist license. This horrifying act leaves the audience in utter shock.
Lelouch’s Sacrifice – Code Geass

Lelouch played his final card in the grandest way possible, sacrificing his life to bring peace to the world. He becomes a despised figure to unite the world against him, only to be replaced by Suzaku, who takes on the mantle of Zero. As Lelouch falls, we come to realize that everything was part of his grand plan.