Board Thread:Speculation House/@comment-11188061-20131230160446

Like, not even the Grimm does, and I've went through every single character images just to make sure. This may be interesting.

A short (but somewhat irrelevant) theory is that the color of their eyes are actually the original/base color/light of their soul. As you know, there's a Chinese proverb saying that the eyes are the windows of a soul, so it's a possible thought. 