From the Super Mario Wiki
Itsunomanika Heihō is a rare type of Shy Guy appearing in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, and Yoshi's New Island. Itsunomanika Heihō hide behind foreground objects, such as crystals. If a Yoshi comes into contact with an Itsunomanika Heihō, a Bandit will appear to steal Baby Mario, and the Itsunomanika Heihō will ride Yoshi similar to a Grim Leecher, but unlike it, it doesn't reverse the player's controls. Itsunomanika Heihō can be defeated with any attack.
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