In "Solo Leveling," the protagonist's strength and determination to continuously improve himself inspire others by demonstrating that hard work and perseverance can lead to incredible growth and power. Other characters witness his progression from being weak to becoming one of the strongest hunters, which motivates them to push their own limits and strive for greatness. Additionally, his willingness to protect and support his allies showcases his strong sense of camaraderie, further inspiring those around him to work together and overcome challenges.