Futaba Shimamura

Futaba Shimamura is the middle child of the Shimamura family, and the sister of Mitsuba and Ichiyo. Unlike her brothers, Futaba is ill-tempered, has a no-nonsense attitude, and is not interested in Kamen Rider at all. She resents Ichiyo for making her into a social pariah with his Kamen Rider obsession since childhood, to the point that she banned him from her restaurant, and is annoyed over how he found like minded friends when she wasn't able to. It's implied that she has no such issues with Mitsuba as she congratulates him on his "marriage" with Yukarisu.