CHAO ADVENTURE
Left - prototype Chao Adventure Sonic. Right - Final version.
Quote Iceknight: "Well, we all know that Flicky has been appearing in the Sonic series since the very first Sonic game, until Sonic Adventure. But the same designer of that character (Y. Kawasaki, no idea what the Y stands for) also created this character, among others: I don't know what game is this guy from, but it sure looks a lot like the Chao, don't you think? I doubt it's just a coincidence, there must be a big fan of Mr. Kawasaki inside the Sonic Team... "