Disney heavily restricted the use of Mickey Mouse in the game especially as the central character like Square initially wanted. This was because Disney was nervous about the success of the game and did not want its possible failure leaving a black mark on the company and its mascot. Tetsuya Nomura stated that these contractual restrictions went so far as to have Disney allow Mickey to only make a minor cameo appearance (such as "in the background of a crowd" as Nomura put it). Spoiler:Nomura and his team got around this by having Mickey have an extremely important but brief role at the end of the game in the form of Mickey helping Sora close the Door to Darkness so no more Darkness gets out of it, separating the two. King Mickey even appears mostly in silhouette in this scene. When the first Kingdom Hearts became a humongous success for both Disney and Square, the former allowed the game developers to feature their mascot in a much more prominent role in the franchise from then onward.