2D Facial Animation on 3D Mesh

Hello, I’m interested in trying to do a 2D facial animation on a 3D object. To hopefully explain that a little better, I would like to do something similar to how it’s done in Wind Waker, where it appears to just be painted on. As it would be drawn I wouldn’t think there would be bones, so I’m hoping someone here could help me out, or simply point me in the right direction. Thanks!