Super Mario Bros. 2 (NES/SNES)Edit
He simply appears as a red or blue enemy with a mask, you are able to stand on it and you can grab it by pressing down and run button, there are 2 version of him there are red and blue, red can fall but blue cannot fall, blue can fall by some way like moving block push, slopes, etc. There are several variants like Snifit and Autobomb.
Shy Guys reappear tn this game as footservants of Kamek, the evil Magikoopa. They exist in various varieties such as Stilt Guy, Snifit, Zeus Guy, Toady, Pyro Guy, and others. Yoshi can eat them to get eggs, or just jump on them. In areas where Yoshi needs eggs as ammunition, there will usually be a pipe where Shy Guys jump out.