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 have featured several new original, Disney, and Final Fantasy characters, Dream Drop Distance introduces characters from Square Enix's The World Ends with You, while Kingdom Hearts III introduces characters from various Pixar franchises.

Various types of merchandise modeled after the characters' likeness have been produced, including figurines and jewelry. The characters have garnered praise from several video game websites and magazines for the quality of their voice acting and visual style. Comments have focused on the accurate presentation of Disney characters, the unique visual style of Square Enix characters, how well all the characters blend together, and the consistent quality performances from voice actors.