what is the historical account behind kingdom?
The developers were planning to make a game with freedom of movement in three dimensions like "Super Mario 64" but lamented that only characters as popular as Disney's could rival a "Mario" game
Kingdom Hearts
They were planning to make a game with freedom of movement in three dimensions like "Super Mario 64" but lamented that only characters as popular as Disney's could rival a "Mario" game. 
where did the idea for kingdom hearts come from It began with a discussion between Shinji Hashimoto and Hironobu Sakaguchi about "Super Mario 64". what are its characters? It features a mixture of familiar Disney and "Square Enix" characters, as well as several new characters designed and created by Nomura what kind of music it features? The main theme of music include "Hikari", "Passion" and "Oath". what is the second mentioned theme? UNANSWERABLE
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Kingdom Hearts [SEP] History
The initial idea for "Kingdom Hearts" began with a discussion between Shinji Hashimoto and Hironobu Sakaguchi about "Super Mario 64". They were planning to make a game with freedom of movement in three dimensions like "Super Mario 64" but lamented that only characters as popular as Disney's could rival a "Mario" game. Tetsuya Nomura, overhearing their conversation, volunteered to lead the project and the two producers agreed to let him direct. A chance meeting between Hashimoto and a Disney executive in an elevator—Square and Disney had previously worked in the same building in Japan—allowed Hashimoto to pitch the idea directly to Disney.