Pollyana would be funny –on OUAT she’d be a pessimist I bet. The term is a synonym for relentless optimism, sort of like Snow!
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass