Another artist I wanted to look at for good character references is an illustrator called Travis Millard. His mostly monochrome medium is more often filled with moving, meaningful monstrosities. From pages of eye practice to expressive yet simply designed monsters. These kinds of simple yet expressive forms are useful to look at, as well as a joy to behold.

Now the following two would be lovely to do in stop motion: Double-face dude and grabby faces already look like you want to reach out and interact with them and are solid and 3D, even with simple use of line. Begging to be made into models. The possibilities of animating these are amazingly complex yet simply full of opportunities of expression and story-telling.