スコティッシュフォールド
"Kingdom Hearts χ" was co-directed by Tetsuya Nomura, one of the series' creators, and Tatsuya Kando, who had previous directed Nintendo DS game "The World Ends with You". The game's music was composed by Yoko Shimomura, a regular contributor to the series' music. The game was co-developed by Square Enix and Japanese studio Success Corporation. Square Enix originally handled the planning and design itself, but due to their developers' inexperience with creating browser games, development was transferred to the Success Corporation, who were familiar with the process. Despite multiplayer elements being included, the game was "fundamentally single-player", as with most other entries in the series. Chirithy, the player characters' companion, was designed around the concept of a supportive yet unobtrusive guide. Nomura based the character's design on the Scottish Fold domestic cat.