So in the above linked video, what I can see is that the animators are using a plans to show different shapes of the mouth. same thing could be accomplished with texture swaps for certain frames. What I notice is allot of jrpg games use this technique rather than render a full mouth for a number of reasons. keeps the cartoony apeal, probably lower cpu usage, and probably easier to implement. I do not know the name of this technique they are using. But would like to see how it could be done here in unity. I can see this being easy(but time consuming) in blender but how would one get this into unity?