White Shy Guy

White Shy Guys are white colored Shy Guys found in the game Yoshi's Story. They are friends of the Yoshis, and could be considered the antithesis of the Black Shy Guy, as the White Shy Guys works against their Shy Guy brethren, while the Black Shy Guys are the elites of Baby Bowser's Shy Guy forces.

If a Baby Yoshi finds a White Shy Guy, the White Shy Guy will follow behind the Yoshi like a Yoshi Egg, copying the Yoshi's movements until the stage is completed. Indeed, the White Shy Guy will take the place of one the Yoshi's eggs, meaning that the Yoshi can only carry five eggs instead of the normal amount of six. After the stage is completed, the White Shy Guy can be selected in the Yoshi select screen. If selected, the White Shy Guy will equip the helicopter backpack of the Flying Shy Guys and travel to Baby Bowser's Castle in order to rescue any Yoshi that has been captured by the Toadies. However, the White Shy Guy can rescue neither Black Yoshi nor White Yoshi. White Shy Guys are usually hidden inside ? Bubbles or ? Blocks in the levels they appear in.

Mario & Luigi: Bowser's Inside Story
In Mario & Luigi: Bowser's Inside Story, white Shy Guys appeared in Bowser's Castle, but this time they are working for Fawful. The player never gets to fight them on his/her own, but when the Sniffle Thwomp faints at the start, three White Shy Guys come in, pick him up and carries him to Bowser.

Trivia

 * A White Shy Guy is also playable in DS Download Play mode in Mario Kart DS.