Ririka Momobami

Ririka Momobami, the Vice president of the student council at Hyakkaou Private Academy. She is quite intelligent, stoic, and strategic. She is an excellent gambler. Despite all the qualities, Ririka is extremely shy without her mask, that is covering her face. She becomes easily flustered without it on. With her mask on, she is cold, more collected, and confident. Her mask helps her with her shyness, and helps to hide the fact that she is identical twin sister of Kirari Momobami, the President of the student council.

Ririka's face is mostly hidden throughout the series by a white, theatrical comedy mask that provides vocal distortion. As Ririka is the identical twin sister of Kirari Momobami, the two of them share all of their facial features as they both have pale skin, long platinum hair (gray hair in the anime) with bangs that are styled in a hime-cut, peach/pink tinted lip balm, and light blue eyes. Unlike Kirari, Ririka keeps her long hair down and she doesn't wear lipstick or painted nails, unless she is posing as Kirari.

Ririka wears the standard female Hyakkaou Private Academy issued uniform. A red blazer with black trim lining the cuffs and collar, a white button up dress shirt, a dark pleated skirt, a tie, and black/grey colored tights and the academy's issued footwear: brown colored loafers with black soles.

When Ririka and Kirari were born into the Momobami estate, the rest of the family already decided which one of them would become a future heir of their family. They determined that by giving each one of the newborns a die to see what number they will draw. Despite Ririka being the older one from the pair of twins, the dice "didn't pick" her, so she was put into position where her existence was erased and was meant to externally experience her twin sister for the rest of her life. Due to this, since early childhood, Ririka wasn't allowed to do anything for a child her age besides just quietly accompany Kirari during family meetings while wearing a mask.

Despite this treatment, their bond was still very strong. In private, they would talk about their desire to escape from their family, stating that they never liked them in the first place. Although they had mixed feeling towards this decision, both of them came to the conclusion that they are the same, so they perfectly understand each other's feelings.