For me, it would be GLaDOS.
Portal 2 spoiler
She deleted the one remaining human part of herself because it was just too much to deal with. She releases you at the end of Portal 2 as a path of least resistance measure because “killing you is hard.”
What about you, what is your favorite media villain?
What do I want? I want to live long enough to be there when they put your head on a pike as a warning to future generations that some deals come with too high a price. I want to look up into your cold dead eyes, and wave. Like this. 👋