First and second drawings are red hank. A hank clone made by the A.A.H.W. He also has yellow blood like the engineers and soilders. Also while he never really thought about this. If the auditor ever somehow died he would either stop working for the A.A.H.W (or atleast try to) or try and take over as the new boss

Last image is charles. A rouge A.A.H.W member who is trying to set up his own organisation. Despite it not looking like it in the photo he does actually have hands.

Also lastly the first drawing is actually fanart of red hank but the person that made it got banned so i cant really give credit..

Fanart is welcome