"The Noppera-bō (のっぺら坊 Noppera-bō), or faceless ghost, is a Japanese legendary creature...[They] are known primarily for frightening humans, but are usually otherwise harmless. They appear at first as ordinary human beings, sometimes impersonating someone familiar to the victim, before causing their features to disappear, leaving a blank, smooth sheet of skin where their face should be." -Wiki

It relates to the theme because it is an old Japanese creature. I used the clothing shown for the era of the theme. I thought a sunny yellow would brighten the mood of such a dark being.