well... why are east asians so law abiding? because the ones that weren't didn't get to reproduce and got killed. but east asia is a large area with a large population so there is more variety. pacific islands are smaller with less population so you really see selection playing out. that goes with any animals in the pacific islands.
as far as their character theyre usually pretty chill dudes despite being hella big.
usually big dudes tend to be asshole bullies but theyre pretty chill at least from my experience. or maybe I haven't ran into enough of the thugmaxxed ones.
i know that in rare cases when east asian dudes that are huge, say like 6'0+ 260+lbs, they are almost always bullies.
also, someone already said it, they do come off as air headed as fuck and indeed their IQ is about the same or even lower than black americans.