Following Akira Kamiya, Ryoma’s original voice cast in Getter Robo (1974-1975) and Getter Robo G (1975-1976), Ishikawa voiced Ryoma in Getter Robo Armageddon (1988-1989), Shin Getter Robo vs Neo Getter Robo (2000-2001), and New Getter Robo (2004).
Ryoma is one of the protagonists of the original Getter Robo series, who piloted the Getter-1 (Getter Eagle), Getter Dragon, Black Getter, Shin Getter-1, and New Getter.
Nine days ahead of its premiere in Japan, the official website for the forthcoming TV anime adaptation of Getter Robo Arc, the final installment of the Getter Robo Saga manga series created by Go Nagai and Ken Ishikawa, announced 11 additional voice cast members, including 51-year-old Hideo Ishikawa who will reprise his role as Ryoma Nagare.