Alien Hybrid Genetics

I don't know about skin color, I kind of have a whole bunch of custom ones anyway and the game always favors those ones instead, but.. one thing I can tell you about alien hybrids is that the vampire/alien kids are very glitchy. Wish someone would fix them! Their appearance is incredibly unstable. You basically have to be very careful when using CAS.

This also happened naturally through gameplay, with no script mods enabled at the time. So I'm honestly just waiting for a patch to fix the kids born from abducted vampires.