Character Designer Yuya Nagai has posted a couple AMAZING, un-official fanart illustrations of characters he designed for NieR:Automata to his Twitter account. Although they are not official illustrations, they are still beautiful works of art for these characters.
The first illustration is of the mysterious twins, Adam and Eve. The second is an intense look at the YoRHa Commander. I especially like that image due to her distant looking gaze that seems so deeply sorrowful. If she is the same “Commander” from the stage play, I can entirely see why… and how very heavy her duty and obligation to her job actually is…