Pozzo and Lucky
Together they represent the antithesis of each other. Yet they are strongly and irrevocably tied together — both physically and metaphysically. Any number of polarities could be used to apply to them. If Pozzo is the master (and father figure), then Lucky is the slave (or child). If Pozzo is the circus ringmaster, then Lucky is the trained or performing animal. If Pozzo is the sadist, Lucky is the masochist. Or Pozzo can be seen as the Ego and Lucky as the Id. An inexhaustible number of polarities can be suggested.