The youngest and newest member of the Organization, Roxas (ロクサス Rokusasu), the "Key of Destiny", was "born" when Sora briefly became a Heartless. However, due to a combination of Sora's short time as a Shadow and Kairi's heart serving in his creation, Roxas had no memory of being Sora. He wields the Oblivion and Oathkeeper Keyblades, and controls the power of light and the Samurai Nobodies. His name is an anagram of Sora with an x added.

Roxas' first appearance was in the "Another side, Another story..." video that is unlockable if the player accomplishes certain tasks in Kingdom Hearts; he was the first Organization member to be revealed. He later appeared in an additional video, "Another Side, Another Story deep dive", for Kingdom Hearts: Final Mix. When pre-release screenshots and video showed this character without an Organization cloak, he was featured prominently, emphasizing his importance to the future game's plot. In the absence of an official name, fan names included Glowing-Eyed Unknown and Dual-Wielding Unknown as he appears in "Another side, Another story deep dive" and Blond-Haired Kid when he was revealed in his Twilight Town outfit. The Square Enix-given name in Kingdom Hearts Alpha Ultimania was Misterious Boy sic) and debated his importance in the plot.

He is voiced by Jesse McCartney in the English version of Kingdom Hearts II and Koki Uchiyama in the Japanese version.

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Story

During his time in the Organization, he and Axel became best friends, but that changed after Xemnas revealed Sora's existence to him. Roxas, against Axel's wishes, wanted to find out the truth behind who he really was and left the Organization.

Roxas in "Another Side, Another Story deep dive".

Roxas cooperated with Riku when he was attacked by Heartless due to possessing the Keyblade, but the two soon fought each other. Roxas was victorious in the first encounter, but after Riku took possession of the power of darkness and confronted him again Roxas was defeated. Riku took him to DiZ, who placed him in his virtual Twilight Town with no memory of being a Nobody. DiZ had Naminé replace some of Roxas' memories with Sora's, much to Axel's fury, who did not want Roxas involved with DiZ's plan. As a result of DiZ's scheme, Roxas lived a normal life in a simulated Twilight Town until his past came back to haunt him when Axel infiltrated the simulated town to reach him.

Although he is able to remember his past as the thirteenth member of the Organization, and despite Axel's attempts to stop him, he merges with Sora at the beginning of the game as part of DiZ's plan to restore Sora's memories faster so that he would be active again to fight the rest of the Organization. Despite the fact that Roxas seemed to have been assimilated into Sora, he appeared two more times in The World That Never Was near the end of the game. The first was a confrontation with Sora that led to a one-on-one fight. The fight is never fully explained and is left open for interpretation. Roxas appears once again with Naminé as they both combine with their Others before Kairi enters the corridor of darkness back to the Destiny Islands. He and Naminé imply that they will would not fade but live on within Sora and Kairi as both a part of them and as their own seperate beings, as we see in the ending cinematic when they smile at each other through their other selves.