Amara is the Darkness itself and, in other words, the balance of evil vs. good. She and God's (or Chuck's) creation caused a balance in the universe that was essential for creating the Earth and all of the power in the galaxy.
She almost destroyed the world and chose her brother over the stability of their universe, making her a controversial character.
However, she's another character that cannot control the nature of her powers and existence, making her sympathetic in the sense she only did what she was literally created for.
Meg is one of the many villains that goes from extremely bad to somewhat helpful. Initially, Meg is a villain that helps Azazel and later works with Lucifer.
However, she later ends up helping Sam and Dean to fight Crowley when he seeks to use the angel tablet.
Meg becomes one of the most sympathetic villains when she ends up taking care of a distressed Castiel and eventually falls in love with him.
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