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Official Site: SQUARE ENIX

Kingdom Hearts is a series of action role-playing game 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 and The World Ends with You 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 Chain of Memories, Kingdom Hearts II, 358/2 Days, Birth by Sleep and coded featured several new original, Disney and Final Fantasy characters while the most recent game Dream Drop Distance introduces several characters from Square Enix's The World Ends with You.

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 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.

The Kingdom Hearts series is directed by Tetsuya Nomura, who also works as the character designer of the games. Nomura has stated that unlike working with Final Fantasy characters, keeping the main character Sora alive and interesting over multiple games is a challenge. He also stated that though many of the Disney characters are not normally dark and serious, there were not many challenges making them so for the story, and despite this, their personalities shine because they maintain their own characteristics. Though Disney gave Nomura freedom in the characters and worlds used for the games, he and his staff tried to stay within the established roles of characters and boundaries of the worlds.

Kairi has not been a contender in any CBUB matches.