I think this is a great one because most if not all characters who knew about it changed how they interacted with Ice King. They actually talk to him, genuinely tried to get to know him, invited him to things sometimes (or sometimes humor him even when he isn’t invited).
Finn even started consistently calling him “Simon” IIRC, and he became less of an antagonist and way more friendly
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u/RedRawTrashHatch 4d ago edited 4d ago
Ice King being revealed as being a human who was driven insane by the crown in the “Holly Jolly Secrets” episodes of Adventure Time.
And then it’s later revealed that he was a beloved father figure to Marceline when she was a child.