Roxas ( Japanese : ロクサス , Hepburn : Rokusasu ) is a fictional character from Square Enix 's video game franchise Kingdom Hearts . First revealed during the final scenes of the 2004 title Kingdom Hearts : Chain of Memories , Roxas is a " Nobody " , a being created when the series ' main character Sora briefly lose his heart during the first game of the series . Kingdom Hearts II reveals that Roxas is a member of Organization XIII , a group of Nobodies who needed Roxas as he could wield the Keyblade , a weapon that allow him to capture hearts . As a member of the organization , Roxas bear the title " Key of Destiny " ( めぐりあう鍵 , Meguriau Kagi , lit . " Serendipitous Key " ) . He is also the protagonist of the video game Kingdom Hearts 358 / 2 Days , which revolve around his origins . In the Japanese games , Roxas is voiced by Kōki Uchiyama , while Jesse McCartney take the role in the English versions .