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Amy is a character mentioned in Calvin and Hobbes. She was mentioned in a single strip of a single story arc. In it, Calvin pleaded for his mother to get a different babysitter than Rosalyn. His mother then replied that a certain Amy just laughed when called, implying that she was a previous babysitter to whom Calvin had been problematic.

It is possible the she is the babysitter in the strip.

Calvin: We've cot a babysitter tonight

Calvin: Ready?

Hobbes: Ready.