According to series creator Hideo Kojima, the decision to make a new character to replace Solid Snake for most of "" stemmed from the developer's desire to develop Snake from a third-person perspective. Kojima stated that Raiden's character and his perception by the audience were important to the overall feel of the story. The idea of having a second main character was inspired by the Sherlock Holmes short stories and novels in which the narrator is Dr. Watson rather than Holmes. Kojima said Snake was the game's protagonist rather than Raiden. Yoshikazu Matsuhana, assistant director for the project, was uncertain about this decision; he considered Raiden a "weak-looking character" but decided to follow Kojima. The codename "Raiden" was based on that of the Mitsubishi J2M Raiden, a historical combat aircraft of the Imperial Japanese Navy Air Service. It was initially planned to be written in katakana as "ライデン", but was changed to the kanji form "雷電" because of a resemblance to Bin Laden's "Laden" in katakana, "ラーディン". His full name was going to be "Raiden Brannigan" but the idea was scrapped. The romantic relationship between Raiden and Rosemary was inspired by Kojima's experiences; their names, Jack and Rose, are a reference to Leonardo DiCaprio and Kate Winslet's lead characters in the film "Titanic". In "Metal Gear Solid 2", Raiden is considered to be a representation of the player through the experiences between the player and the character during the game.