Kingdom Hearts II is a 2005 action role-playing game developed and published by Square Enix in collaboration with Buena Vista Games for the PlayStation 2 video game console. The game is a sequel to Kingdom Hearts, and like the original game, combines characters and settings from Disney films with those of Square Enix's Final Fantasy series. An expanded re-release of the game featuring new and additional content, Kingdom Hearts II Final Mix, was released exclusively in Japan in March 2007. The Final Mix version of the game was later remastered in high definition and released globally as a part of the Kingdom Hearts HD 2.5 Remix collection for the PlayStation 3, PlayStation 4, Xbox One, Windows, and Nintendo Switch.

Roxas is a character from Square Enix's video game franchise Kingdom Hearts, who first appears as a cameo during the final scenes of Kingdom Hearts: Chain of Memories and makes his first full appearance in Kingdom Hearts II. He is a "Nobody" who was born from the series' main character Sora after he briefly lost his heart during the events of the first game. Kingdom Hearts II reveals that he is a member of Organization XIII, a group of Nobodies who need him for his ability to wield the Keyblade, a weapon that allows him to capture hearts. As a member of the organization, Roxas bears the title "Key of Destiny" . He is also the protagonist of the video game Kingdom Hearts 358/2 Days, which revolves around his origins. He is voiced by Kōki Uchiyama in Japanese and Jesse McCartney in English.