Unbelievaboy! evolves into Bad Boya when fused with a Bad Ball.
A light pink-skinned baby humanoid Yo-kai, Unbelievaboy! has a bronze colored wisp on top of his head as hair and wears a blue mask (or goggles), red cape, nappy, and blue shoes.
Anyone Inspirited by Unbelievaboy! acts like a baby.
His english name Unbelievaboy is portmanteau of Unbelievable and Boy.
His Spsnish name, Superniñato is a combination of Súper (Hereo normal name) and Niñato (Disdainful way to call a child).
- It is shown in the anime, that if you remove Unbelievabou's mask, he will act like a normal baby.
In other languages
- Italian Incredibimbo
- Spanish: Superniñato