Toriyama had previously worked with Square to design the characters for Chrono Trigger, and Ishii says "at first, we were going to do a fighting game using characters from Chrono Trigger.

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Instead, he choose a supporting character from Square Enix's 1995 RPG Chrono Trigger. While speaking with IGN, Schwartz cited Chrono Trigger's anthropomorphic hero Frog as his favorite.