In ‘Marvel Studios’ Assembled: The Making of Agatha All Along, ‘Aubrey Plaza talked about playing Death, explaining that she enjoyed the character’s complexity and contradictions.
She appreciated being able to play three different versions of the same character, which she felt could work well in the MCU due to her otherworldly and yet grounded nature.
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They will probably just the tip it with a few cameos in the next one and see if they can go to the hilt on the one after that.