With a calm nature, he 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".

Being a Monokuma, he enjoys killing and gore, though he acts more calm about it than overly excited Monokid. In general, he also appears interested in money and success, and 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, even calling his father useless at one point. Moreover, he approves of hostility and infighting among the group, believing that the Monokuma Kubs should be "awkward and unsociable".

While generally appearing smarter than the other Kubs, Monosuke might show-off (as his siblings put it) and accidentally slip out. He is also known to be very impatient whenever he feels cranky.