Monotaro is the leader-esque figure of the Monokuma Kubs, a group of child-like robots. As a leader, he tries to unite the group members' discordant voices into one. However, being a scatterbrain, he gets sidetracked a lot and often struggles to keep his rambunctious siblings focused on the task at hand. He is also mentioned to have a clumsy side, giving him a childlike charm.

Compared to Monokid and Monosuke, Monotaro is relatively mild-mannered and less openly hostile towards the students. He also seems considerate of Monofunny and overall appreciates all the members of the group. Nevertheless, he is evil, just like all the siblings.