Short-tempered and foul-mouthed, Monokid is the most violent of the Monokubs.

He doesn't really pay attention when others are talking, and will chime in seemingly at random to spout incoherent nonsense. He is often the reason that the group's conversations suddenly derail.

Monokid loves to bully Monodam, and has subjected his sibling to so much abuse that his heart has grown cold and distant. He loves to pepper his sentences with the catchphrase, "Hell yeah!"