Which children's book character was specifically created as a brand mascot to help sell more books through a publisher's marketing campaign rather than appearing in a story first?

In the publishing world, brand mascots and iconic characters have helped sell millions of books and create lasting literary empires. These brand identities have become cultural touchstones, often transcending the pages to become merchandising phenomena. Test your knowledge of these literary brand icons that have shaped the publishing industry's marketing strategies and consumer recognition.

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Clifford the Big Red Dog
Waldo (Where's Waldo?)
Geronimo Stilton
The Cat in the Hat