A good cartoon in my opinion should be able to "be read" by any person regardless of what language they speak. In order to achieve this, in toons involving two or more characters, the personalities of each character should be so distinct that the reader should be able to not only make up their own dialogue that fits the visual situation, but also clearly identify the subtie nuance of personality. Study any Disney film and freeze frame a scene. You will always see the intangible nuance of personality, intention, and character displayed in the body language or facial expression. You develop this ability to capture this by exploring your own emotions, and getting into yourself" without a doubt, all goid animators and character designers are great actors and actresses as well.