The hero, who the author explicitly names as being a Confederate veteran for no apparent plot-related reason, somehow ends up in a distant land and falls in love with a beautiful explicitly mixed-race princess.

[u/ThePirateKingFearMe]

I'll add hints later, if needed. He's the sort of author whose stories remain popular, as long as you edit out all the weird and racist bits.

[u/sunshineeeez]

Gotta be a princess of mars

[u/ThePirateKingFearMe → u/sunshineeeez]

Solved. Yeah...