Sex between the Races Lore?

[Enkidoh]

Arenvald has no Garlean traits. Although some Garleans aren't that different from Hyur anyway (see Cid), so it's hard to say for sure.

Well, he does have a lot of the Garlean physical stature more than Highlanders (not that Highlanders are not physically impressive themselves), and there was also the tragic aspect of his backstory where his mother thought a pimple in the middle of his forehead was growing into a Garlean third eye when he was still a young boy (which she promptly removed in the most horrifying way), leaving his forehead permenantly scarred (it's why he has that 'X' tattoo on his face).

Whether it really was a third eye is never confirmed, but the game definetely seemed to tease the possibility.