Shy Guys are masked enemies seen in many Mario games, beginning with the American version of Super Mario Bros. 2, but not reappearing until Super Mario World 2: Yoshi's Island. There are several different variations of the Shy Guy that are found in an assortment of Mario games. There are various subspecies of Shy Guys as well.
Shy Guy is a playable character. In challenge mode, if the player chooses Yoshi's team, he will get a team of Shy Guys.
In Mario Tennis, Shy Guy is an unlockable character who is unlockable by beating the final cup - Star Cup. Shy Guy is wearing the normal red outfit it usually wears and has a red racket with a picture of the Shy Guy's mask on it. His special ability is "Tricky."
Mario Strikers Charged
In Mario Strikers Charged, Shy Guy is a playable sidekick. He brings a balanced approach to game, with average skills in all areas. If he gets the space, he can hitch-a-ride on a Bullet Bill and create a great scoring chance.
Mario Kart Wii
In Mario Kart Wii, Shy Guys are seen in the Retro Course, Shy Guy Beach on pirate ships, which fire cannonballs that explode, often flipping a player's kart over. They also appear on the sides of varies other tracks as well.
Mario Super Sluggers
Shy Guy is on Yoshi's team. Five colors (red, blue, yellow, green, and gray) are available.
Mario Kart 7
Shy Guy is a playable character in Mario Kart 7. This marks the first time that Shy Guy is playable without having to go into DS Download Play. He also has a course named after him, Shy Guy Bazaar.
Shy Guy's Jungle Jam - Shy Guy hosted his first ever board map in Mario Party 4. In this jungle-themed board map, various Shy Guys are scattered around the board and own the various shops and events. There are two different shrines on the board that contain stone statues of Shy Guys. If a player lands on the happening space in front of the shrine, they will be asked to offer a gift to it. At the top of the board, there is a giant rock engraved like a Shy Guy.
Shy Guy's Perplex Express - Shy Guy owns his own board map once again in Mario Party 8. On this board, Shy Guy owns a train that contains various different train cars. On this train, different Shy Guys can be seen working on conductors and chefs.
Bumper Balls - A lone Shy Guy appears in the Mario Party 2 version of the game inside of a frozen volcano, but does not effect gameplay.
Shy Guy Says - Shy Guy appears as the host of this mini-game that acts similar to the childhood game "Simon Says". Shy Guy will hold up a different color flag that has either the letter "A" or "B" on it. The characters must press the corresponding buttons, or they will be eliminated by Shy Guy.
Bus Buffers - At the start of the mini-game, a Shy Guy knocks down the bucket of slime that makes the buses dirty. Also, various Shy Guys can be seen cleaning the buses during the mini-game.
Chomp Romp - A lone Shy Guy can be found swinging on a swing in the park. If the player's Chain Chomp crashes into the swing, Shy Guy will rotate faster for a brief moment.
Curvy Curbs - Various Shy Guys can be seen waving at the character's from the edge of the tracks.
Dinger Derby - Various Shy Guys can be seen in the crowd, along with Koopas and Goombas. It is possible for a player to hit one of the Shy Guys with a ball.
Fish Upon A Star - A Shy Guy can be seen flying around in a blimp while the players are battling on the floating island. The logo on the blimp depicts the Shy Guy's face.
Moped Mayhem - A Shy Guy can be seen racing on a moped along with the other racers.
Shy Guy Showdown - Shy Guy becomes the host of this mini-game, where he is wearing an old western outfit. In this mini-game, two characters will face-off against each other and must pay attention to the sign that Shy Guy is holding. The sign that he holds up will contain a button that the player must press quickly in order to shoot ink at their opponent. However, Shy Guy will hold up a fake sign to deceive the players.
Flagging Rights - A Pirate Guy, accompanied by two other Shy Guys appear in this mini game. The Pirate Guy has two flags. You have to follow which one he holds ups. If you fail to do this, by simply not doing it, or doing the wrong flag, a Shy Guy will untie your plank and you will fall. This mini game is similar to Shy Guy Says. And it's named after a game called "Bragging Rights.
Mario Party 9
This is one of Shy Guy's most significant roles due to the fact he has become a playable character after beating the story mode once. In story mode he plays for Bowser so if he wins he will return the mini stars collected to Bowser resulting in the player going through the party board again.
Paper Mario series
Shy Guys appear in Paper Mario during Chapter 4: Trials in the Toy Box. They are seen causing a ruckus in Toad Town, stealing various townsfolk's items. After going to East Toad Town, Mario enters a house and must use Bow to hide himself to see Shy Guy jump through the wall. After the Shy Guy has gone, Mario must do the same by jumping through the wall.
After jumping through the wall, Mario comes in contact with a springboard and a Toy Box. Once Mario jumps on the springboard, he is transported into the Toy Box. This starts the fourth chapter in the game.
There are many sub-species of Shy Guys found in the Toy Box.
Shy Guys return in Paper Mario: Sticker Star as common enemies. Regular Shy Guys are found in Bowser's Snow Fort where most can be fought and one is running the mine cart ride. Versions of Shy Guys known as Sombrero Guys also appear in levels of World 2. They have a habit of jumping into a fight alongside another enemy. Two other Shy Guys appear in World 3 are Clip Guys and Paint Guys only in battle with other enemies. After they are successful in their respective attacks, they throw away their items and become regular Shy Guys.