Simply put, they're mostly medium complexioned. The current thoughts in academia is that they started out as a dark skinned race. Many years ago they mixed with mainland northern invaders called the Ainu people who themselves were light skinned people. Other groups such as the Mongols, Chinese, and Polynesian people left their mark as well. Even longer ago their was a dark skinned race that invaded all the coastal areas from Australia all the way north to Korea. So they have mixed colors and that's what keeps them interesting. The Chinese people are pretty much the same, the further south one goes the darker the complexion. Years ago, prior to WW2 the Japanese considered "white" the most beautiful color for women and the women avoided the sun completely. The men would marry the lightest women possible creating an even more lighter skin race. However, things change! Today if asked, many Japanese would prefer being called yellow, even if they're extremely dark or bone white. They currently have only moderate interest in being white anymore.