Do fantasy races work for you? Everything I can think of still follows the same criteria of normal-faced, thin and large-breasted, but I'm still curious.
Otherwise you still have text games, but those only fall under the condition that they do not state a race and only indicate skin color, making the point moot. The most I've ever seen of asian/blacks is short racial TFs scenes in tfgamessite's games. Of which, the text games focused on weight/muscle are either in-progress or dead.
Free Cities has some race/weight/muscle mechanics.
Elysium is just a tech demo, but would be a game focused around weight-gain in various forms.
In the end, this was a useless post, only able to state that even through years of lurking hentai games forums, tfgamessite, and certain places, that I feel the need to state that there really isn't much to find on the surface. That which isn't games, but adult doujins/comics also rarely have varying body-types, as artists may cater to trends with some exceptions. Alternative races portrayed themselves would instead also be the men, and not the women. In fact, there is no end to the variety of male's portrayal, whether it's race, age, weight, muscle, or height. While I know you're not the only person, the only thing that could motivate any change at this point would be money, otherwise any artists or writers that are capable would continue to provide content to their comparably smaller circle of fans.