The protagonist's journey in Solo Leveling inspires other characters through his determination, growth, and perseverance in the face of challenges. Other characters witness how the protagonist faces formidable enemies, improves his skills, and never gives up despite facing overwhelming odds. They are motivated by his relentless pursuit of strength and his unwavering commitment to protect those he cares about. As a result, other characters in the story are encouraged to push beyond their limits, strive for excellence, and become stronger individuals themselves.