Calvin and Hobbes has had some dark comics throughout its 10-year run. It’s always been a known fact that the comic has a more mature sense of humor. Not because it is raunchy or bloody, but because they tackle some surprisingly heavy subject matter, more so than most of its contemporaries at the time. Most newspaper comic strips tended to be of the lighter variety. Things such as the childish shenanigans in Peanuts or the mundane musings of Jon Arbuckle in Garfield (although both of those certainly had their dark moments as well). Regardless, Calvin and Hobbes was just different.

https://screenrant.com/darkest-calvin-hobbes-comics-all-time/