Calvin and Hobbes, minus Hobbes: https://calvinminushobbes.tumblr.com/
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Edit: if you want to ruin your day, check out this C&H fan art https://www.reddit.com/r/calvinandhobbes/comments/6vwll2/is_...
It's not reality. Hobbes it's not unambiguously stated to be a figment of Calvin's imagination either.
That's a fine interpretation but it's not canonical. Watterson wanted the ambiguity, as Wikipedia mentions (sorry, I don't have the interview with the direct quote where Watterson states this):
> "[Watteron] gave an example of this in discussing his opposition to a Hobbes plush toy: that if the essence of Hobbes' nature in the strip is that it remain unresolved whether he is a real tiger or a stuffed toy, then creating a real stuffed toy would only destroy the magic."