Kingdom Hearts is a series of action role-playing video games developed and published by Square Enix (formerly Square). It is the result of a collaboration between Square 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 and Final Fantasy 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 around the main character Sora's search for his friends and his encounters with Disney and Final Fantasy characters on their worlds. There are few playable characters in the games, though there are numerous characters that are able to join Sora's party as computer controlled members. The majority of the characters were introduced in the first game, Kingdom Hearts. Several new characters were introduced in the sequel, Kingdom Hearts: Chain of Memories, which also features alternate versions of previous characters created from Sora's memories. The third game, Kingdom Hearts II, added more Disney and Final Fantasy characters, as well as introduced new antagonists.
Various types of merchandise modeled after the characters' likeness has 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 focused on the accurate presentation of Disney characters, the unique visual style of Square Enix characters, how well all the characters blended together, and the consistent quality performances from voice actors.