Ryusei Tsurugi is the protagonist of the tokusatsu series Choujinki Metalder. Originally created as a combat android named Metalder, he is reactivated in the present day and given the human identity Ryusei Tsurugi. With a strong sense of justice and humanity, Ryusei battles the evil Neros Empire, protecting the innocent and seeking to understand his own existence. As Metalder, he combines advanced robotic abilities with a compassionate heart, making him a heroic central figure in the series.