In the short story "To Build a Fire" by Jack London, the characterization of the narrator plays a crucial role in highlighting the overall theme of the story. The narrator is depicted as an inexperienced and naive individual who underestimates the power of nature. This characterization serves to emphasize the theme of man's insignificance in the face of nature's relentless and unforgiving power. Throughout the story, the narrator's ignorance and overconfidence are evident, as he disregards the advice of the old-timer and ventures out alone in extremely cold conditions. As the story progresses, the narrator's lack of knowledge and preparation becomes his downfall, as he falls victim to the brutal winter climate. London's portrayal of the narrator as an unsuspecting victim showcases the theme of the indifference of nature towards man's existence. Additionally, the characterization of the narrator also serves as a cautionary tale, warning readers of the consequences of underestimating and disrespecting nature's supremacy. Overall, the characterization of the narrator in "To Build a Fire" effectively contributes to the story's theme of man's vulnerability and insignificance in the face of the natural world.