Here are 4 different prototype stylized figures. They're supposed to be some sort of 'chibi' type version of Tails, Knuckles, & Sonic. These are prototyped here by FunkoPop , the same company that did the bobble heads figures. Prototypes are generally done in some neutral color like white or gray. Later, the figure may be made in a plastic that the character has the 'most color of'. So that bottom Tails is orange. Casting him in orange plastic means you only have to use paint for a few details. These will likely get simplified paint jobs (such as all-black for the eye-dots) to go with their simple style.
They're actually sort of creepy here, like little zombie baby fairies or something. Some things likely look better painted, will this set be among them? The 'style' is a unique approach, hopefully these will go from proto to toy.