Rio Futaba is one of the main characters of the Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai series, who is a second-year student at Minegahara High School. She had been in the same class as Sakuta and Yuuma during their first year and is the sole member of the Science Club. Rio's case of Adolescence Syndrome is explored in the third novel. Rio is an attractive girl of average height. She has light brown eyes and grey hair, and wears glasses. She is primarily seen wearing her…