If it's a role like this one, an actual live person, a legend, there's lots of material laid out.
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The characters are not allowed to change if you write a sitcom; they're not allowed to learn anything. There's all these sorts of rules, and you go, 'I just want to be able to write one character and then leave that behind.' Also, as a performer, and I may regret saying this, but it would be my own personal hell to be trapped in the sitcom.