How do the 'villain' archetypes and their motivations differ between typical American comics and Japanese manga?

American comic villains, especially in superhero stories, often embody the antithesis of the hero's values, seeking power, chaos, or destruction, with motivations ranging from grand schemes to personal vendettas. Their presence often represents a clear moral challenge. Japanese manga villains can be far more nuanced. While some fit the 'evil incarnate' trope, many have complex backstories, relatable motivations, or even operate under a twisted sense of justice or duty. The exploration of gray morality is more common, blurring the lines between hero and villain.