Rintaro's brother, Masayuki Hayashi, is himself an anime director and animator with credits including Wandering Sun, Kimba the White Lion, Combattler V and several Tatsunoko productions including Kerokko Demetan, Dash Kappei, The Littl' Bits, and Okawari Boy Starzan S.
Born Inoue Rintarō in Hino in 1826, he was Inoue Sōzō's younger brother and related to Inoue Genzaburō's family.
After going through a painstaking journey across multiple 'World Lines' due to the invention of 'D-Mail', text messages that can be sent to the past, Rintarō Okabe has assumedly landed in the "Steins Gate" World Line, in which he was able to prevent the deaths of both Mayuri Shiina and Kurisu Makise, as well as prevent a future ruled by SERN due to the invention of a time machine no longer exists.