Matsudaira Riko, also known as Rikopi, is a second generation member of Sakurazaka46. When first she auditioned for Keyakizaka46, she coincidentally performed the same song as first generation member Watanabe Rika. She is one of the closest juniors to Rika and ex-member, Nagasawa Nanako. She has a habit of calling different members when she is having trouble sleeping. Riko has shown interest in fashion, and her goal is to become a model. Despite attaining the lowest score on the academic test among the whole group, she studied law in university and has shown her intelligence in other ways. Shortly after the release of Sakurazaka46's first single, Riko announced that she would be graduating from the group. On November 5, 2021, Riko announced that she will be restarting her entertainment activities.