|Nicknames||Tetsu the Hedgehog|
|Anime debut||Yu-Gi-Oh! (Toei) episode 2: "The Evil Gamer - The Trap of Hell"|
Tetsuo Sasaki (ササキテツオ Sasaki Tetsuo), also known as Tetsu the Hedgehog (針ねずみのテツ Harinezumi no Tetsu), is a character in the Toei Yu-Gi-Oh! anime. He is person who was framed by Jiro the Jorogumo. Jiro disguised himself as Tetsu and broke out of prison. While Tetsu also broke out and attempted to commit some robberies, he was also framed for a variety of crimes that were committed by Jiro. He was in the restaurant, Burger World, and everyone thought that he was the escaped convict after an investigation. However, he accidentally, but fortunately, made Jiro discovered.