>>57941363It's based on the Scale World figurines, yeah.
I think it's because the characters were made by Japanese people, who have a different sense of scale for height since they are on average much shorter than Europeans and Americans. So there's a lot of grown female characters who don't reach 170cm, which is why Nemona seems tall in comparison. But she's just slightly above average for a woman compared to European standards.
>>57941379Eh, Arven can grow sideburns and has a very developed Adam's apple. I think he's like 17. So he might still grow a little but not much. Maybe it's supposed to show that he was suffering under malnutrition as a kid, but that's just my headcanon.