The Calvin and Hobbes Wiki
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Marvin was an early concept for Calvin. He was just like Calvin except that he had much longer, shaggier hair. The name was eventually changed to Calvin, then later Bill Watterson removed the long hair.

As far as I know, there were only two strips with Marvin being mentioned. One where he asks his mother if hobbes can have some Dinner, and one where he's in his Spaceman Spiff outfit in class and gets sent to the principal. These strips are shown in the book, "Exploring Calvin and Hobbes"

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