All cute and fuzzy unless you broke the rules. Those three rules were part of his personality. Things that had to be known to make him who he was, and to make the story happen. Several characteristics can help to stereotype your characters' personalities, and make them drop into a particular category very quickly for the viewer. One of the most obvious is the eyes.
Eyes can show such a wide range of emotions that they lend a lot to the personality of characters.
If the eyebrows are furrowed and the eyelids are down low, there is no doubt that the character is angry. If the eyelids are open and the brow is raised, an inquisitive or curious look will exude from the character. Examine each of the images shown here. Notice how no part of the clown's face changes other than the eyes, yet he is still able to show a wide range of emotion. Additional properties that enhance the personalities of characters are their mannerisms.