Our usual favourite black male characters, Mansa Musa and Shaka are probably going to be DLC just because they're so popular. So I don't think it's a race thing.
Somehow, we've looped back around and Firaxis has started gatekeeping the characters that they know people like to play as, and leaving us with relative nobodies on release. Or perhaps a nicer way to say it is that they like to experiment with some new faces on release
That's just my opinion, but, no Victoria or Elizabeth, no Shaka, no Mansa, no Gandhi, no Genghis, no Montezuma, no Alexander, no Saladin, and if I recall correctly, Napoleon isn't even available by default.
Now I'm only saying that if those were 5.99 each, they'd have a field day and everybody would buy them, and for that reason, you're probably feeling a gap in the roster. I don't particularly think it's a race thing.
P.S. This makes me miss the Ethiopian guy from Civ5. He was pretty cool.
P.P.S. I do relate though. The M.E. representation on release looks a bit horsehockeye too. Although with time it'll probably get better.