Stoker

Stoker is the robot in the Power Plant of Mars responsible for putting the coal into the furnace.

When the Avatar met him in Martian Dreams, Stoker was unable to do his work, since the conveyor belt was broken and out of power, thus he didn't get any coal from Coker. Unlike Coker, Stoker was quite chatty and explained in detail, how the power grid of Mars worked. Stoker made it clear, without power almost nothing would work and said that the conveyor belt needed to be repaired.

After repairing the belt and jump-starting the furnce to power it, Stoker got all the coal he needed to again do his job.