Darwin is a very happy and positive person. He is optimistic, always trying to see the best in most of the scenarios he is in, and in general, always tries to have a smile on his face. Not only does he desire to be happy, but he also desires to see others happy. His selfless acts of happiness can be seen in episodes such as "The Fan," "The Advice," and "The Stories." In all three episodes, he chooses to do the things he does in order to make a particular sad person happier.