In the webcomic "Solo Leveling," the power levels of characters are crucial as they directly influence their abilities and strengths in battles. Characters with higher power levels typically possess superior combat skills, strength, speed, and magical abilities compared to those with lower power levels. This often leads to a significant power gap between characters, affecting the outcomes of fights and determining who emerges victorious. Additionally, characters may undergo power level increases through training or special events, further impacting their overall abilities and potential in the story.