Raised in the United States since the third grade, she graduated from an American high school, joining the Genshiken at the beginning of the Fall term. Normally soft-spoken and easily embarrassed, Oono is surprisingly upfront when it comes to one of her two main passions: cosplay. With a nice figure and large bosom, Oono and her cosplaying (using costumes sewn personally by [Tanaka](https://anilist.co/character/2510/Tanaka-Souichiro), whom she begins dating) quickly become Genshiken's main attraction at student fairs. Oono's other main passion is yaoi involving muscular, middle-aged, exceedingly bald men. ~!The fourth president of Genshiken.!~