I know they have Thor and the lesser received Hercules under their belt but how about maybe they made a new superhero based on a lesser known mythology. I mean there are tons like Egyptian, Polynesian, Vodun, Mesopotamian, Incan, Aztec, Slavic, Finnish, Aboriginal, etc.
http://marvel.wikia.com/Category:Pantheons
One candidate I would advocate is Maui because he is a well known folk hero in Polynesian mythology. He is what Heracles is to the Greeks. I mean look what Marvel did for Thor because wasn't the reason why they chose Norse mythology because it wasn't as big in the public conscious as back then. However, through Marvel Norse mythology is probably second to Greco-Roman mythology in the minds of Americans. Although the people in Scandinavia probably are not all that happy how us Americans butchered their stuff so learning from the mistakes of the past if anyone does a comic based on Maui they need to do some extensive research and get some good consultants from Polynesian culture.
http://en.wikipedia.org/wiki/M%C4%81ui_(mythology)