Raiden, who was inspired by the Sherlock Holmes stories and a fan's letter wanting a younger character to be featured in the series, originated from Kojima's desire to see Snake from a different point of view. His inclusion in "Metal Gear Solid 2" was kept secret from gamers before his debut; despite some players' reactions, the staff liked the character. To appeal to fans of the series who initially disliked him, the character was redesigned for "Metal Gear Solid 4". He was again redesigned for both the cancelled game "Metal Gear Solid: Rising" and its reboot "Revengeance" to portray a darker side of his character. Raiden is voiced by Kenyu Horiuchi in Japanese and Quinton Flynn in English.