The Japanese Metal Gear Solid V: Ground Zeroes Limited Edition includes a Metal Gear Solid: Peace Walker novelization with illustrations by Yoji Shinkawa. Here is another artwork created for the book, showing the Boss’ Cobra Unit.
On the drawing you can see, from left to right: the Pain, the End, the Fury, the Joy, the Fear and the Sorrow.
Unfortunately this book seems to be for Japan only.
Source: Hideo Kojima Twitter