Carl can be sarcastic, often having quick-witted and playful responses for his Android. Despite his good humor, Carl can also be quite somber and reflective, often bringing up his own old age, poor health, and impending death in a matter-of-fact way, once referring to himself as "just an old man clinging to his brushes". He can be a tad misanthropic at times. He expresses having little interest in seeing other people or attending social gatherings, and seems exhausted by said obligations. 