Mr. Blue-Shy

is a Yo-kai of the Heartful tribe.

Origin
Tereteru-bozu is based on the, a small traditional handmade doll made of white paper or cloth that in shape and construction they are essentially identical to ghost dolls, such as those made at Halloween. This amulet is supposed to have magical powers to bring good weather and to stop or prevent a rainy day.

In the modern day, children make teru teru bōzu out of tissue paper or cotton and string and hang them from a window when they wish for sunny weather, often before a school picnic day. Hanging it upside down acts like a prayer for rain.