Ryoji is very flirtatious and lively while also having a kind, gentle, caring and empathetic personality. However, like Junpei, Ryoji can be very perverted at times (usually when they are together), and it is heavily implied that he is a bit of a voyeur, as evidenced during the events at the hot springs at Kyoto. Ryoji shows up as a transfer student, claiming his parents are working overseas. Ryoji's flirtatious personality immediately gains people's attention and his frequent antics with Junpei causes him to often get on Yukari's nerves. Aigis continually expresses an unknown feeling of hostility toward him and repeatedly warns Makoto to keep his guard up around Ryoji. Despite the warnings, Ryoji later befriends Junpei Iori and Yukari Takeba, along with Makoto and the other members of SEES. He proclaims to be from a rich family, and is apparently very popular with his classmates. During a school trip, Ryoji, Junpei, Akihiko, and Makoto attempt to get in a hotspring with the girls by "mistaking" the time. Eventually, Yukari, Mitsuru, Fuuka, and Aigis show up in the hotspring, much to Akihiko's panic and fear.