Ririka Momobami

Intro The plot of Kakegurui revolves around Hyakkaou Private Academy, a prestigious institution where the social hierarchy is determined by wagers. Students wager their fortunes against each other, with the wealthy and skilled wagers, holding power and the indebted becoming "pets". Yumeko Jabami, a transfer student with a love for the thrill of gambling, disrupts this established order, challenging the Student Council and its president, Kirari Momobami, who becomes intrigued by Yumeko's chaotic influence. Ririka: Ririka Momobami is a supporting character from Kakegurui. She is the Vice President of the Student Council at Hyakkaou Private Academy, and the older identical twin sister of Kirari Momobami whose family is aligned with the family of Yumeko Jabami.Ririka is a very quiet and stoic person who often acts as an observer. Despite her silence during the Student Council's meetings, she's mostly in step with Kirari Momobami. However, she does seem to be less cold, as she acted very shocked when Midari Ikishima gouged out her own eye.It's revealed that when she doesn't have her mask on, Ririka is an incredibly shy and somewhat socially awkward person, who visibly has a lack of self-confidence, which makes her a complete opposite of Kirari. 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, forcing her to believe that she wasn’t her own separate person and instead merely an extension of Kirari.