The comment below mine explains it perfectly actually. I can conform that they are based off of a once living person however I don't think that they are aware at first which is why I think the side part Soho was saying they feel something in their mind, something alive but not quite, but couldn't figure out what it was. The human version of Soho (don't know their real name) died quite tragically and I think (not confirmed) that a peice of their conscience or even past memories where implanted into some of his robot variants.
I dont understand what the robot was saying about someone inside of them can someone explain please