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Spoilers start here.
Monokid is killed during Kaede Akamatsu's execution, when Monodam pushes him towards her as the spiked piano cover closes, destroying his body in Chapter 1.
Spoilers end here.
Monokid's appearance is similar to that of his father, Monokuma, but the part that is black on Monokuma is blue on him, though half of the blue on his face is white. Likewise, his eye is black with a red pupil, contrasting Monokuma's and he has bright pink cheeks. He has black chest hair and gray stars around both of his eyes,
He dons sharp shoulder pads, has a yellow pacifier and is shown carrying a blue guitar.
Monokid is a child-like robot. However, he also has a very bad mouth and a short temper, and he's considered the hooligan of the group. He enjoys rock music and playing his guitar.
Since he does things like saying incoherent stuff without listening to anybody, he's the main cause of conversations getting derailed. He also occasionally messes up words or says things backwards.
He is also most violent out of the siblings. He gets very excited about violence, claiming that it "turns him on". He also habitually bullies Monodam, even though they should be comrades. It's said that this is the reason why Monodam has closed his heart.
Monokuma is the self-proclaimed father of Monokid, Monotaro, 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.
Monokid loves to bully his brother, Monodam, both verbally and physically, even though they should be comrades. Monokid says Monodam has "an ugly and cheap-looking body", implying that he may dislike him because of his different looks. It's said that this is the reason why Monodam has closed his heart.