@Mr_NutterButter One of my good friends is half white, quarter Dominican, quarter Japanese. He's basically white lmao, you would never guess his siblings were related to him xD
Two girls I've dated were also half white half Japanese and I never would have guessed if they didn't have Japanese middle names xD
With black/Mexican and white, I've noticed that, more often than not, they trend towards being more like whatever race isn't the white one. I have a step-cousin that's white/black and she may as well be black tbh, despite being raised by a single white mom. I think this is because it actually is more socially incentivized.