Of the three confirmed mixed race characters we've seen (Hilda, Arvenvald, and Severa), two of them seem to take most of the mother's appearance with a few traits of the father. Hilda looks like a Midlander with pointed ears, and Severa looks like a Midlander with a Garlean third eye (although hers is blackened rather than the usual pearly color). Arenvald notably lacks any obvious Garlean traits, explicitly mentioning that he has no third eye, but Garleans mostly look like Hyurs anyway (or Elezen with Hyur heads, like Nero). A Hyur/Raen child is mentioned in the Heaven-on-High quests, apparently looking mostly like an Au Ra with fewer scales, but isn't shown.