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I really enjoyed as a kid the Gaston Lagaffe and Spirou written and drawn by Andren Franquin https://en.wikipedia.org/wiki/Andr%C3%A9_Franquin

He also authored a black humor series for adults really worth reading.

I would say European and south American comics are mostly unknown in the US. L'incal, Corto Maltese, Mafalda, El Eternauta... There is a whole world which is distinctly different from the mainstream American style and manga/manwa, and very interesting.

The recently released film Valerian is based on a 70's french comics Valerian & Laureline that is/was totally unknown in the US.

Even more interesting is how much inspiration a certain George Lucas seem to have drawn from them:

http://www.ign.com/articles/2017/07/30/are-the-valrian-and-l...

There was magazine, called Heavy Metal, that published in the US european comics from the french Metal Hurlant magazine (Moebius, Enki Bilal, Corben, Milo Manara...).