Kozo, the Yokai Ninja!

Meet Kozo, a yokai I designed for a character from the Yokai realm. He's based on two yokai, Yanari, tiny oni who run around and cause random noises in the house to scare residents, and Hitotsume kozo, a cyclopean priest boy known for their long tongues and prankster nature. The mask he wears in the second picture is f