Sakko

A tiny monkey who acts as a spy for  Skeleton King. He was originally presumed to be  Jinmay 's pet in the first episode, but he pins her down and opens up her chest, revealing that she is a robot. He fails Skeleton King and is taken away by a strange jack in the box looking robot with legs, but he appears in later episodes and with an eyepatch. He makes a brief cameo in the final episode with Krinkle, drawing a picture of the Skeleton King holding him, he says joyfully.