High Quality Content by WIKIPEDIA articles! This is a list of video game characters in the Ninja Gaiden video game series, the hero of which has been always the ninja Ryu Hayabusa. As the universe of the Ninja Gaiden series has been rebooted as of 2004 with the release of Ninja Gaiden on the Xbox, this list will have two sections, one for the original trilogy on the NES, and another for the `rebooted` universe since 2004.