I can see how the majority easily misses these because of the designs. The MC has a few markers that shows black ancestry as well, on the face, bit in the build and mostly the hair, but Charlotte lacks those completely, so it's no surprise that people wouldn't recognize them as black. Ayana though looks straight Spanish/Portuguese, or a Mestizo, while it's her mom that you could tell that is a Mulatto.Ayana is black as well. Honestly don't really see how you mistook her for a white girl but it's all good lol. And that's another thing.
Using the n word in 2020 will bound to earn you some flames, as there are people that rather rename NWA into Black People With Attitude these days.