I'd say a robot sounds more like a machine.

[And there's a small but definite edge to that word, because he is programmed to hate the enemy. At the same time, he has the presence of self to acknowledge how incredibly complex that is, now]

But inside I'm metal and circuits, and my blood's synthetic. Units like me are built in the image of mankind, and that's who we're meant to protect. I even need to breathe, which isn't true of machines.