Shy Guys are masked enemies who debuted in Super Mario Bros. 2. They mainly found around World 4. There is also a large number of them in 7-1. There are four types of Shy Guys in this game.
Types of Shy Guys
Shy Guy: Red Shy Guys walk right off platforms, like Green Koopas. Blue Shy Guys turn around at the edge, like Red Koopas.
Spike Guy: Spike Guys are green at throw Spiked Balls at you.
Jump Guy: Jump Guys are yellow and jump high in place.
Giant Shy Guy: Giant Shy Guys are just like Shy Guys, except bigger! They come in red, blue, green, yellow, and pink.