I have found references to a character named Ben (old Ben or Uncle Ben) in a John Carter book. However, all I can find about him is he was likely a slave (or, "bondservant").
Is there any more information on this character? His importance, connection to John Carter, and what happens to him? Spoilers allowed.
I came across this is character while researching this question:
While it does not seem to be what I was looking for, it has raised some other questions, which I think may be obvious, but I will refrain from giving free advertising (until I get my check).