Blue Gender, Soukihei MD Geist Recommendations
Both titles are set in a post-apocalyptic setting with a similar vibe. They both feature characters that can use mecha and armor battle suits to battle powerful enemies. They are also both action-packed anime with lots of violence and blood. If you enjoy MD Geist and want a better post-apocalyptic anime, check out Blue Gender. If you like Blue Gender and want another post-apocalyptic anime with a similar vibe but with a weaker plot then maybe give MD Geist a try.
Both of these anime are from Koichi Ohata and have a similar dark post-apocalyptic setting. These two anime has humans colonizing space and mecha battle armor suits to use in combat. Both of these anime are filled with action, blood and gore too.