From the Super Mario Wiki
Itsunomanika Heihō is a rare type of Shy Guy only appearing in Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island: Super Mario Advance 3. 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. Itsunomanika Heihō can be defeated with any attack.
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