There must be foreign comic book superheroes, protagonist characters with superhuman or magical abilities. Which superhero is the highest selling, therefore the most popular, superhero published outside of the United States? I'd like to know the name of that superhero and brand of comic he or she is featured in.
The "Hero": Monkey D Luffy
Ability: Rubber Man
Comic: One Piece
Magazine: Shonen Jump
Last Issue: Sold 3.16 million copies.
To Date: Sold 250 million volumes.
Son Goku, the hero of Dragon Ball and its many follow-ups. There's no doubt to his super-heroic credentials:
Goku is introduced as an eccentric, monkey-tailed boy who practices martial arts and possesses superhuman strength. At first, Goku is believed to be an Earthling, but he is later revealed to be a member of an extraterrestrial warrior race called the Saiyans... As Goku matures, he becomes one of Earth's strongest warriors and protects it from villains who wish to harm it.
The original manga has sold over 300 million books worldwide (only One Piece has sold more comics); on top of this there are numerous spin-offs and shorter sequels, four anime series, twenty films, and enough video games that is is also one of the biggest video game franchises as well.
I concur that asterix is probably the right answer, but maybe not exactly the US-style superhero.
Wikipedia doesn't seem to offer interesting options.
If batman counts as a superhero, than possibly Super Duck/Paperinik/Duck Avenger (donald duck's hero alter ego) could be the most known outside of north america, having been in print stories worldwide since the '70s, but originally created in italy.