From what I've seen, black female and white male offspring tend to be very ugly, white female and black male off spring tend to be very good looking. But then again on average when a white man goes for an ethnic foid, he's usually at best a low tier normie and the ethnic foid tends to be very ugly, so I'm sure that's a contributor, white foids who go for ethnic men usually go for Tyrones, or Chaddams or Changs etc. and the white foids who go for them are always at worst high tier Beckies.
As for white male Asian female couples, like with black women and white men, the white male is at best a low tier normie, while the Asian foid he's with is usually ugly, look at Mark Zucherburg and his wife, good example. So yeah gender and SMV plays a powerful role on how mix race kids turn out.
But in my experience I've seen a mixture of attractive and unattractive race mixes, that's why I'm not vehemently against race mixing like so many people are here, but I'm not vehemently pushing for race mixing either like the left and mainstream media does. I'm more or less neutral on racemixing and I'm willing to race mix with a foid regardless of her race as long as she's enticing enough for me.
That's just me though.