Based on popular opinion and discussions among fans, there are a few betrayals from the list that are commonly considered as particularly shocking:

1. The betrayal of Reiner Braun and Bertholdt Hoover in Attack on Titan is often mentioned as a shocking moment due to the revelation of their true identities as Titans, after being portrayed as trusted allies for a significant portion of the series.

2. Aizen Sousuke's betrayal in Bleach is also frequently regarded as a surprising twist. His manipulation and deception throughout the series, followed by the revelation of his true intentions, left many viewers stunned.

3. The Kyubey betrayal in Madoka Magica is notable because of the revelation that the seemingly innocent creature had been manipulating the magical girls all along for its own purposes. This unexpected betrayal subverted the initial impression of the character and added a darker layer to the story.

4. Itachi Uchiha's betrayal in Naruto: Shippuden is significant because it involved the annihilation of his own clan, including his family members. The reveal of his true motivations behind the betrayal, which were not initially known, added a complex and emotional aspect to the storyline.

Again, the most shocking betrayal can vary depending on personal preferences and individual investment in the series. Different viewers may have different perspectives on which betrayal affected them the most.
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