Mega Guy

Mega Guys, also known as Mega Shy Guys , Giant Shy Guys or Big Shy Guys , are Shy Guys that are larger than normal.

Super Mario Advance
Giant Shy Guys first appear in Super Mario Advance. They act much like normal Shy Guys, except that they provide a Heart when they are thrown at the ground or defeated. They take a few more seconds to be picked up due to their heavy size.

Super Mario-Kun
In the small short that concludes the chapter in volume 26 of Super Mario-Kun, a Big Shy Guy attacks Mario, Goombario, and Kooper. It then pits Mario against Robirdo. Mario, however, grabs the Big Shy Guy and throws it against Robirdo, defeating both.

WarioWare: D.I.Y. Showcase
In WarioWare: D.I.Y. Showcase, a Big Shy Guy is one of the enemies that can appear in the microgame Mario Adv.

Yoshi's New Island
In Yoshi's New Island, Mega Guys spawn from large pipes, and unlike the game's regular-sized Shy Guys, they are impervious to stomps and constantly walk forward, only turning around once they reach a wall. Yoshi can swallow them to turn them into Mega Eggdozers, which can be used to destroy otherwise indestructible obstacles. Mega Guys require a bit more effort than normal to swallow, as the player has to rapidly press to do it. A metallic variant known as Metal Guys also appear, which are used to make Metal Eggdozers.

Other appearances
Big Shy Guys appear in an early trailer of Yoshi's Story, though they are not present in the final game. They also appear in the Yoshi Demo, where stomping one would turn it into a regular Shy Guy.