Even if we ignore that the future queen could be any color, Q still isn't even the most prominent dark-skinned character we've met so far: Lliria is. We don't know as much about her yet, but she's definitely very clever, well-spoken, kind, and immaculately put-together.
Also, where is this notion that Q is "fierce" and "barbaric" coming from? It's possible that he could be fierce, but we haven't seen anything but calmness from him so far. He seems competent and alert and very self-controlled, not "barbaric" in any way. He is certainly strong, but that's not necessarily a racial stereotype, and any of her guards would have to be strong. He doesn't speak fluently, but the text makes it clear that that's because he's new to the area, not because he's unintelligent in any way.
It's important to be aware of racist or racially insensitive characters, but Q very clearly isn't one.