If we want to talk about the actual races (i.e. “Clans”) I’m more interested in what happens if say, a Raen and Xaela reproduce. Or Sun and Moon Miqo. Or Plainsfolk/Dunesfolk, etc. etc. I personally have my guy as half-Raen, but Xaela traits tend to be more dominant so for all intents and purposes, he looks like a Xaela (maybe with some very subtle white speckles and accents here and there) and generally is counted as one. In a similar fashion, every clan has their (legit) racial difference and it’d be interesting to see a scientific “mixed-race” person of the same species as an NPC.
If it works anything like irl human biracialism though, the kids could easily lean one way or another in addition to the possibility of looking like a mix. I actually came across someone else with a mixed race Au Ra boy, except in their art he’s got both black and white scales and horns. I kinda doubt that would actually happen so dramatically, but a more subtle version sounds plausible (i.e. there’s one hairstyle for Au Ra males that has white horns sticking out no matter which clan you pick; and of course there’s the fact even the default horns can be accented with the reverse color). Now, I wonder if a Sun-Moon Miqo would have both the cat eyes of the Sun Seeker and the fangs of the Moon Keeper. Hyur would probably work more like irl human mixes, but no one seems to mention ethnicity much with Hyurs, lol.