Monofunny's appearance is similar to that of her father, Monokuma, but the part that is black on Monokuma consists of pink and vertical magenta stripes. Likewise, her eye is white, contrasting Monokuma's and she has bright pink cheeks.
She wears a brown bikini top with a sakura flower printed on both sides. She wears a light pink flower and has a yellow pacifier.
Monofunny is a child-like robot with a feminine personality. Her personality appears much more gentle than her brothers and her kindness is mentioned to be "an unique character trait". She isn't good with gore and cruelness, which is why she is often seen vomiting.
She has a tendency to do cute things like trying to solve the killing game via rock-paper-scissors, or suddenly falling asleep, and liking flowers. When the siblings begin their usual fighting, she often plays the mediator, but in the end she always ends up joining in the fight.
Despite her kind demeanor, she can speak in a mean and crude way just like her siblings. She also tends to say things with somewhat mixed messages, including both kindness and cruelty in the same sentence. She may express worry towards others, but she can also lack compassion. Being a Monokuma, she indeed seems to be evil even though sometimes appearing nice.
Monokuma is the self-proclaimed father of Monofunny, Monotaro, Monokid, Monosuke and Monodam. 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.