Let us get the most obvious out of the way first. Castiel was such a brilliantly complex character, who showed us that angels could be flawed and redeemed, just like us mere mortals. He struggled, he made mistakes, but the thing about Cas was he never stopped trying to be better.
And his capacity for love was mind-blowing.
The human character and Castiel’s vessel, Jimmy. When Cas first possessed him, he did not think twice about it. But as Cas became fonder of humans, he realized what he had taken from Jimmy, as well as Jimmy’s wife, Amelia, and his daughter, Claire.
Redemption and trying to save Claire becomes an important arc for Cas as a result.
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