Ryu (Street Fighter) the development team, was meant to let viewers know he was "a karate master at first sight". In an interview with "Game On!", Capcom Research and Development head Noritaka Funamizu stated that of the series' characters, Ryu was one of the most popular characters with American audiences, alongside Zangief and Guile. For "Street Fighter IV", Kyle Hebert was cast as Ryu in preparation of the return of his "Evil Ryu" persona. In an interview with Gamereactor, Ansah talked about Ryu and Ken's story from "Street Fighter: Assassin's Fist" and said "a good analogy with Ryu is that he's not actually
Ryu Hayabusa a "Bio-Noid", created by Irene's superior and corrupt CIA director, Foster. After Ryu defeats the double, Foster is killed by H.P. Clancy, who had instructed Ryu to locate a ruin called the "Castle Rock Fortress", which was the base of Foster's Bio-Noid experimentation and has also secretly housed an interdimensional warship that Clancy intends to use for global dominance. Ryu kills Clancy in battle and the ship is destroyed as Ryu escapes with Irene, bringing the first-generation "Ninja Gaiden" storyline to a close. The 1992 Sega Master System version of "Ninja Gaiden" scraps the entire narrative of the original series