Comparing comedy of Chaplin and Keaton:
The foundation for the two characters is different. Chaplin’s character is mischievous or even roguish: he steals, is short-tempered, starts fights. Charlie instigates much of the action, and while he is graceful Charlie moves through a chaotic world. His flaunting of social convention leaves us wishing we could be so bold.
Keaton’s character is one of perseverance: he struggles to make due despite woe-begetting circumstances of bad luck. Buster responds to much of the action in a world where physical laws seem to temporarily suspend their norms