Moral ambiguity is like that gray area where right and wrong aren't clearly defined, and I love how it messes with your head. Take 'Death Note'—Light Yagami starts with this noble goal of wiping out criminals, but power twists him into something monstrous. Is he a hero or a villain? The story forces you to wrestle with that question, and there's no easy answer.
Then there's 'The Last of Us Part II,' where revenge cycles blur the lines between protagonist and antagonist. Ellie and Abby both do terrible things for reasons that feel justified to them. It's uncomfortable, but that's the point. These stories stick with me because they mirror real life, where morality isn't black and white but a messy, shifting spectrum.