Which of these literary characters was specifically created as a brand mascot first, before appearing in books?

The publishing industry has long understood the power of memorable characters to drive book sales and build author brands. From children's literature to bestselling thriller series, certain character mascots have become powerful marketing tools that help establish author identities and create customer loyalty. Test your knowledge of these literary brand ambassadors and how they've shaped the publishing landscape!

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Clifford the Big Red Dog
The Berenstain Bears
Geronimo Stilton
Harry Potter