These are animated characters. So not only do you need to have the 'flesh' made procedurally (meshes/polygons), but also the 'bones' onto which the meshes are a

These are animated characters. So not only do you need to have the 'flesh' made procedurally (meshes/polygons), but also the 'bones' onto which the meshes are attached for animation. Procedurally creating static meshes is one thing, doing the same for bones and animating it with a mesh so that it looks credible is a whole other story ...