The Yoyo prototypes are a group of prototype counterparts of the character Yoyo on the earliest concept art sheet by the French book author Romuald Racioppo.
The Yoyo prototypes all wear cat costumes, similar to Yoyo's. However, their cat costume consists of a cat nose, and their stripes varied in number. It is unknown what color these prototypes are, but it is speculated that they're blue like Yoyo.
Powers and abilities
The prototypes' powers are unknown, but it is possible that they might have the same powers as Classic Yoyo.