Kou Nakano is an Ajin. Nakano is very considerate of others He was also concerned for Izumi saying she shouldnt put herself in danger. He is also a bit clumsy compared with other characters and often doesnt know whats going on. As seen in the recent chapters he is not good with coming up with plans and prefers to improvise instead. This results in him relying on Kei a lot with strategic plans much to Keis annoyance. it is revealed that K had first died when changing a light bulb. He stacked a bunch of magazines on top of each other and tripped. After that he was left paralyzed on the floor for days but no one came. He then most likely died of dehydration. It is also pointed out that K had abusive or at least neglective parents.