Most Japanese are very fair, true

but the j-drama that I watch have quite a few darker skin tone actors/actress

dont get me wrong, I dont care about their skin colour, Im just curious about their ethnicity

the facial features, the height, the body size, almost everything about them looks japanese except the skin tone

They dont look indian, austronesian, african, so i dont think theyre mixed blood

and it doesnt look like just a tan to me

I wonder which particular subethnic they belong to