Yasushi Yamaguchi (山口 恭史 Yamaguchi Yasushi?) (also known as Judy Totoya) is a game designer and artist. He designed the character Miles "Tails" Prower in an internal contest hosted by Sonic Team. He originally named the character "Miles Prower", with the "Tails" name tacked on as the name. Yasushi Yamaguchi sneaked in his name though, and "Tails" had become the nickname.
His main work was that of both creating and designing Tails as well as being the Chief Artist and one of Zone artists in Sonic the Hedgehog 2. He also worked as the Special Stage Designer in Sonic the Hedgehog CD and on other Sega related games.
- Sonic the Hedgehog 2 (1992)
- Character Design and Chief Artist (as Judy Toyota)
- Zone Artist
- Sonic the Hedgehog CD (1993)
- Special Stage Designer (as Judy Totoya)
- Scroll Design (Secret Special Stage Staff)