premise: Sora (Kingdom Hearts) works with multiple characters in the world of Kingdom Hearts.
hypothesis: Kingdom Hearts . The series primarily centers on the main character Sora and his journey and experiences with various Disney , Final Fantasy and The World Ends with You characters , whilst stopping the various incarnations of the primary antagonist Xehanort throughout the series . Sora (Kingdom Hearts) . Introduced in the first Kingdom Hearts game in 2002 , Sora is portrayed as a cheerful teenager who lives in the Destiny Islands and has been best friends with Riku and Kairi since childhood . Donald Duck and Goofy then recruit him in their journey across various worlds to aid King Mickey while Sora searches for his friends . In Kingdom Hearts II , Sora searches for Riku and fights against Organization XIII who , like Ansem the Seeker of Darkness from the first game , are attempting to seize Kingdom Hearts for their own .