The problem is that black women are ugly.

So they either make an attractive women and then turn her mocha colored (which is the case with the bunny girl from FF12 or Kat from Gravity Rush seen in the image), or they make a half white mutt (which is how the only attractive ones are made in real life).

The first creates a terrible feedback loop, wherein people become attracted to "black girls" and then the horrible reality will hit them in the face and probably make some racist. It also makes black women think they are more attractive than they are by letting them pretend they are the same as someone who shares no commonality but color when being black has a lot more to it.

The second will never fly with both sides of the political aisle. One side will rage about race mixing and the other will do the same for completely different reasons.