Monosuke is a child-like robot. He is the most cool-headed in the group, seemingly remaining calm whenever the other Monokubs are shocked and analyzes the situations. At first glance, he appears to be the most intelligent as well, being capable of having much more cohesive and intelligent conversations. However, despite this, he is neither mature nor docile, and he has a horrible mouth similar to Monokid. He is somewhat aggressive and tends to call others stupid.