Grimm, read this wiki article on Sword and Planet genre of literature:
http://en.wikipedia.org/wiki/Sword_and_planetEdgar Rice Burroughs wrote the first of his John Carter books, "A Princess of Mars," before WW1 and it was published in 1912. That is generally regarded as being the beginning of the genre. ERB went on to write 10 more John Carter of Mars books. To a large extent it is really trashy pulp literature, but John Carter is really a sort of superhero on a fantasy Mars because his earth muscles giving him a great advantage on the lower gravity of Mars. ERB went on to write the huge Tarzan series along with other Sword and Planet books set on Venus, in the hollow Earth, and on the Moon.
ERB tied up his books with copyright for longer than usual by copyrighting them under a corporation, but the first 3 to 5 of the the John Carter of Mars books are now in the public domain. The ERB corporation, basically his heirs, has kept intellectual property rights to Tarzan via trademark as well as copyright, and has made a lot of commercial use of the Tarzan copyrights and trademark.
The ERB corporation keeps claiming a trademark to John Carter of Mars, but has no actual recognized mark in the commercial marketplace because over the decades little to no use has been made of the alleged mark. Because the ERB corporation has enough money to sue, most people will avoid a challenge to the alleged trademark. Miniature manufacturers will bill their figures as generic sword and planet type miniatures instead of referring to John Carter of Mars. There is considerable validity to that, as ERB was not the only writer of Sword and Planet books, and not even the only one to set adventures on Mars (Otis Adelbert Kline wrote a couple of Mars books about 1930).
Both Parroom Station and Bronze Age Miniatures can be used to represent John Carter and other characters and beasts from the John Carter books. Personally, I prefer Bronze Age Miniatures, now refered to as 32mm instead of the original 28mm, they are slim and very heroic looking, very suitable for this genre. The republication of the John Carter books in the 1960's and 1970's brought some extradinary cover art, very sexy stuff. Both Parroom Station and Bronze Age capture the different looks of some of these covers. You can do a Google Image Search and find some of the covers.