Hitotsumekozou

Hitotsumekozou
一つ目小僧 ( ひとつめこぞう )

In form this spectre is a child of ten years or so, usually a bald-headed young Buddhist monk, but its face is dominated by its one huge eye. Like many obake who are largely human in appearance, the hitotsumekozou enjoys using its monstrous attributes to surprise and frighten people, and loves sassing the humans it meets, telling them to "be quiet!" or greeting them with other childish chides and mockery.

It's said that the one-eyed boys can be repelled by hanging baskets in doorways; the cycloptic little monsters see the basket's many holes as a vast amount of eyes, and run away in jealousy, ashamed of only having one.