What's your favorite "actually a good person" plot twist?

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The original was posted on /r/television by /u/victorpras on 2024-06-27 19:54:53+00:00.

We've seen plenty of plot twist where a seemingly good guy was revealed to be actually a bad guy all along. Is there any opposite example of this? Where someone was teased to be a bad guy but later on it was revealed that they were actually a good guy?

One of the most famous example of this is probably in the movie Terminator 2 (and also in the series Terminator Sarah Connor Chronicles). Are there any other good examples of this plot twist?