Recent concept art for my comic. First set is the mm3 robot masters, which are a season 2 feature. Second set is the Stardroids, which would be a season 4(ish) debut. Also the reporters from battle and chase, which I showed in episode 5
I really like giving each set of robot masters a theme, so that they stand out from each other. The mm3 robot masters are more inhuman, lacking faces and appearing more uniform in design. The Stardroids lack most identifying features, which I feel gives them an eerie incomprehensible-ness that helps them feel truly alien.