Which children's book character was created specifically as a marketing mascot for Penguin Books before becoming a literary phenomenon in his own right?

Publishing houses and booksellers have created memorable mascots to market their literary products over the decades. These characters became cultural icons while driving sales and building brand loyalty in the literary marketplace. Test your knowledge of these famous literary brand representatives who bridged the gap between commerce and culture.

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Paddington Bear
Peter Rabbit
Curious George
Puffin, the penguin