Creating a comprehensive list of top anime betrayals requires a bit of subjective choice. Some spoilers ahead for the following anime:

1. **Anime:** Naruto: Shippuden - **Episode:** 134
   **Situation:** Itachi Uchiha's betrayal of the Uchiha Clan. Itachi was ordered by the Leaf Village's leadership to annihilate his entire clan due to fear of a coup d'état, which he did, except for his younger brother, Sasuke.

2. **Anime:** Attack on Titan - **Episode:** 31
   **Situation:** Reiner Braun and Bertholdt Hoover reveal themselves as the Armored and Colossal Titans, respectively, betraying their comrades in the Survey Corps.

3. **Anime:** Code Geass: Lelouch of the Rebellion - **Episode:** 25
   **Situation:** Suzaku Kururugi betrays his best friend, Lelouch Lamperouge, by revealing his secret identity as Zero to the Emperor of Britannia.

4. **Anime:** Death Note - **Episode:** 25
   **Situation:** Teru Mikami betrays Light Yagami (Kira) by making the decision to kill Takada, causing Light's careful plan to unravel and leading to his eventual downfall.

5. **Anime:** Fullmetal Alchemist: Brotherhood - **Episode:** 19
   **Situation:** Scar brutally kills Nina and Alexander, the amalgamation of Shou Tucker's daughter and her dog. The betrayal was not toward Nina but to the viewers who had grown to love the innocent character.

6. **Anime:** Bleach - **Episode:** 168
   **Situation:** Aizen Sousuke's betrayal was monumental. He faked his death and manipulated everyone around him, revealing himself as the primary antagonist of the series.

7. **Anime:** Madoka Magica - **Episode:** 8
   **Situation:** Kyubey, a seemingly innocent creature, betrays the magical girls by revealing he was manipulating them into dangerous situations, just to turn them into energy sources.

8. **Anime:** Tokyo Ghoul - **Episode:** 12
   **Situation:** Rize Kamishiro, who appeared to be an ordinary girl, lures Ken Kaneki into a dark alley and reveals herself as a ghoul, leading to his transformation into a half-ghoul.

9. **Anime:** One Piece - **Episode:** 405
   **Situation:** Nico Robin's betrayal to join CP9 initially shocked the Straw Hat crew, though it was later revealed she did it to protect them.

10. **Anime:** Neon Genesis Evangelion - **Episode:** 24
   **Situation:** Kaworu Nagisa, initially a friend to Shinji Ikari, is revealed to be the final Angel. His ultimate betrayal culminates in Shinji being forced to kill him.

It's important to note that these betrayals are often complex, and characters may betray others for reasons that are sympathetic or even noble. It adds to the depth of these shows and is part of what makes them so engaging.
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