The following section contains SPOILERS. It has been hidden from view as to protect users from spoiling themselves. Expand it at your own risk.
Spoilers start here.
Monotaro and Monofunny are killed when a large robotic wasp bursts from Monofunny's body during Gonta Gokuhara's execution in Chapter 4.
Spoilers end here.
Monotaro's appearance is similar to that of his father, Monokuma, but the part that is black on Monokuma is red on him. Likewise, his eye is black, contrasting Monokuma's and he has bright pink cheeks.
He also possesses a long gray scarf with a silver star pinned to it and a yellow pacifier.
Monotaro is the leader-esque figure of the Monokuma Kubs, a group of child-like robots. Unlike his siblings, he keeps control of their conversations, though he gets sidetracked a lot.
Despite being a leader, he is the most clumsy of the siblings, 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 appears to care about his siblings despite their constant fighting. Nevertheless, he is evil, just like all the siblings.
Monokuma is the self-proclaimed father of Monotaro, Monokid, Monosuke, Monodam and Monofunny. He calls them his "adorable children", but apparently he also has a tendency to punch them if they annoy him. Considering himself the Headmaster, Monokuma seems annoyed if his children try to steal the show.