Ren Akiyama is one of the main characters in the tokusatsu series Kamen Rider Ryuki. As Kamen Rider Knight, and later Knight Survive, he is a brooding and determined fighter who enters the Rider War to save his comatose girlfriend. Driven by his love and sense of duty, Ren is often stoic and conflicted, but forms a deep bond with protagonist Shinji Kido. His transformation into Knight Survive marks a significant power-up and a turning point in the series.