Yasushi Yamaguchi

Yasushi Yamaguchi山口 恭史, , also so-called as Judy Totoya is the game designer in addition to artist. He designed the address Miles "Tails" Prower in an internal contest hosted by Sonic Team. He originally named the consultation "Miles Prower", however SEGA wanted to asked the character "Tails". SEGA as well as Yamaguchi reached a compromise on his name, with "Miles Prower" being the character's full legal throw and "Tails" being his nickname.

His main clear was that of both making and designing Tails as well as being the Chief Artist and one of the Zone artists in Sonic the Hedgehog 2.

He also worked as the Special Stage Designer in Sonic CD and on other Sega related games.