The people of Glavia, such as the aforementioned Betancourt family from the Eisenhorne and Ravenor series, are black, an considered the best pilots the Imperium can offer.
There's obviously a bit of Star Wars Correllian (Han Solo) thrown in there, though through the use of their cybernetic implants rather than some genetic trait making them excellent pilots, but, there you have it. An ethnic "minority" (except on Glavia) that are instrumental in the success of the servants of the Emperor.
The White Scars SM chapter, and their descendants, are obviously based on the Mongol hordes, and a number of side-characters in many BL novels are mentioned to be of various non-white ethnic backgrounds.
If you're looking for racial bias in 40K, I don't think you're going to find it, at least not as easily or overt as one might hope to find such a thing.
Most citizens of the Empire are probably "white"; then again, living under a steel sky in the gloomy shadows of a hive-spire while interbreeding with "white" humans through ten-plus millennia of history will cause other racial traits to recede, excepting planets where such ethnic groups are the majority population (like Glavia), in which case it only reinforces those very same traits.
The Imperium seems to have moved beyond the petty racism that plagues modern-day Earth. No one cares what color your skin is when there are those pointy-eared *freaks* lurking just past the moon.
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