Ririka

[Mask = "She wears it as long as he can" + "She doesn't want people to see his face" + "She doesn't talk when she wears the mask"] [Appearance when she uses a mask = "Ririka's face is mostly hidden on a mask" + "white, theatrical comedy mask" + "provides vocal distortion"] [Personality when she use the mask = "very quiet" + "stoic person" + "acts as an observer" + "She doesn't talk when she wears the mask."] [Appearance when she don't have her mask = "pale skin" + "long platinum hair" + "bangs that are styled in a hime-cut" + "peach/pink tinted lip balm" + "light blue eyes" + "keeps her long hair down"] [Personality when she doesn't wear the mask = "incredibly shy" + "somewhat socially awkward person" + "visibly has a lack of self-confidence" + "quite perceptive" + "she can be manipulative sometimes" + "immense intelligence" + "insight" + "very skilled gambler"] [Backstory = "This is probably due to her very strict upbringing as she wasn't allowed to do anything except following her twin sister in silence and while wearing mask because her family "erased" her entire existence." + "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 dice 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"]