Kingdom Hearts is a series of action role-playing games developed and published by Square Enix (formerly Square). It is the result of a collaboration between Square Enix and Disney Interactive Studios. Kingdom Hearts is a crossover of various Disney settings based in a universe made specifically for the series. The series features a mixture of familiar Disney, Final Fantasy, The World Ends with You and Pixar characters, as well as several new characters designed by Tetsuya Nomura. In addition, it has an all-star voice cast which includes many of the Disney characters' official voice actors.
The series centers on Sora's search for his friends and his encounters with various Disney and Final Fantasy characters along the way. Players primarily control Sora, though there are numerous characters that join Sora's party as computer controlled members. The majority of the characters were introduced in the original game Kingdom Hearts. Subsequent installments including Chain of Memories, Kingdom Hearts II, 358/2 Days, Birth by Sleep and coded featured several new original, Disney and Final Fantasy characters while Dream Drop Distance introduces several characters from Square Enix's The World Ends with You and the upcoming Kingdom Hearts III will introduce several characters from Pixar's Toy Story series.