Piyopiyoko is a little yellow baby chick Yo-kai that has swirls for pupils and
some stars are circling around it, implying that it might be dizzy.
Piyopiyoko makes people bump their heads and get dizzy, every time someone bumps their head, it will appear and get larger. Once it reaches maximum size, it will lay eggs for new Piyopiyoko to live on its legacy.
In the anime, Piyopiyoko is the only Yo-kai that can't be seen traditionally with the Yo-kai Watch, instead, it must reveal itself willingly.
Additionally, it is the only Yo-kai that is seen actively disappearing.