Kamen Rider Knight

Kamen Rider Knight's name, Naito (ナイト?) also sounds like the English "Night", which could also refer to his color scheme which reflects darkness and nighttime (his color is dark navy). Also, his monster's motif is based on a nocturnal creature. While in his Survive form he has a cape on constantly, making him one of the few Kamen Riders in the entire franchise to wear a cape. His special element seems to be wind.

Ren Akiyama is a cold loner who fights constantly and is frequently unemployed. He received his Advent Deck before the start of the series. He accepted Kanzaki's offer to join the Rider War to give his fiancé, Eri Ogawa, a full recovery, who has been in a mysterious coma ever since an encounter with Darkwing. Ren later contracted with Darkwing and became Kamen Rider Knight.

After Shinji Kido, he would still persist to fight any and all Riders. But the ordeal of his memory loss had him leave the Atori Cafe to clear his head. Meeting Miyuki Tezuka, who reveals himself as Raia, while pointing out that though he accepted his fate as a Kamen Rider, Ren had doubts in his heart if he could actually take a life (as seen when he felt broken after stabbing one of Shiro's decoy Kamen Rider Odins through his body). He later inherited the Survive Shippu Card from Tezuka.

Over time he eventually softened up and slowly came to return Shinji's constant offers of friendship. Throughout the series they formed a somewhat of a rivalry, which Ren took more seriously than Shinji because of the Rider War.

Shiro eventually declares him as the last Rider. All the other Riders had died, but it was Shinji's death in Episode 49 that devastated him, as he had finally accepted Shinji as his best friend. Ironically enough however, Shinji's dying words galvanized Ren into bringing the war to an end. Shiro Kanzaki brought him to fight the remaining Rider, Kamen Rider Odin. As Ren was about to lose, Shiro Kanzaki was tormented by his sister Yui Kanzaki's words, and self-destroyed Odin, thus making Ren the final Rider. The wish appeared, and Ren used it to save Eri's life as he had originally intended. Returning to the hospital where Eri laid, she wakes up to see Ren's engagement ring on her finger, and a loyal Ren, apparently sleeping on the floor. Unbeknownst to her at the time, the battle with Odin had proved too much, and though it is not clearly stated, it's suggested that he died. After Shiro restored time to its proper course after Yui's death, Ren and Shinji gained a new life with no memory of being Riders, thus they are unable to recognize each other in one of the final scenes of the series.From Wikipedia, the free encyclopedia