Is the founder, and leader of both the Akagi RedSuns and Project D. Famously nicknamed Akagi's White Comet (赤城の白い彗星, Akagi no Shiroi Suisei), Ryosuke created the RedSuns with the purpose of dominating the street racing scene all over Japan, recruiting his brother Keisuke and others local to Mount Akagi to achieve this goal. Alongside Keisuke, they're both given the nicknames of the 'Rotary Brothers'. He is a very skilled racer who can predict the racing outcomes by his theories, something that Keisuke (his brother) has been unable to understand and/or replicate. He drives a White Mazda FC3S RX-7. His real aim is to figure out the 'Fastest Racing Theory', and this is where Takumi Fujiwara fits in almost perfectly.
The FC is fitted with a 13B-T Twin-rotor rotary engine. The engine was originally tuned to 340PS, and was later detuned to 260PS for his battle against Takumi Fujiwara. It was likely retuned for any subsequent battles, especially the battle with Rin Hojo, though stats are never given.
