In Sinclair Lewis's "Main Street," the character of Lewis is portrayed as a man with a very frosty demeanor. He comes across as someone who prioritizes business and is not easily swayed by emotions. His coldness underscores a rigid mindset focused on profit and efficiency rather than warmth or compassion toward others. This characterization may reflect a critique of the business-oriented mindset prevalent in society.

Lewis's stern nature serves as a counterpoint to the more vibrant and passionate elements in the narrative. By emphasizing his lack of emotional depth, Lewis's personality creates a dynamic tension in the story, illustrating the struggle between human connection and the demands of an increasingly commercial world. This portrayal invites readers to consider the implications of being overly business-minded and the potential loss of personal relationships and empathy as a result.