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. He is somewhat aggressive and tends to call others stupid. With a calm nature, Monosuke acts like the straight man of a double act stand-up comedy and provides snark to the group's dynamic. He tends to be the one correcting his siblings whenever they say something nonsensical and is sometimes annoyed by them. Whenever his siblings talk their usual nonsense, he tends to intervene by continuing "...more importantly". He enjoys killing and gore, though he acts pretty calm about it. In general, he doesn't seem to get as emotional as the other Kubsーhe dislikes heartfelt moments and doesn't seem to care much about others. In fact, he strongly approves of hostility and infighting among the group, believing that the Monokuma Kubs should be "awkward and unsociable" and insisting that they should be scary and nasty. As a rather notable trait, Monosuke also seems to have great interest in money, success and becoming popular, as he occasionally comes up with new business ideas. While generally appearing smarter than the other Kubs, he might show-off and accidentally slip out. He is also known to be very impatient whenever he feels cranky.

Monosuke has a pretty clear accent, similar to a New Jersey accent. The voice should be around the medium to medium low range for a male. He's not nearly as emotional as the other kubs (Besides Monodam), but he is prone to yelling.