Kozaki is a great guy with a good sense of humor. Death Star Donyatsu was something he created during his "draw off" competition with another artist, Felipe Smith. A few of us who were in the audience thought it would be fun if he drew it for us during his autograph session, and since Japan Expo staff limited him to drawing Donyatsu related stuff, he was happy to doodle this for those of us who attended his panel.