The element of vengeance plays a significant role in shaping Tanjiro's quest as a demon slayer. Throughout the series, Tanjiro's initial motivation for becoming a demon slayer is driven by his desire to avenge the death of his family, who were killed by demons. This intense thirst for vengeance fuels his determination to eradicate demons and seek justice for his loved ones. As Tanjiro progresses on his journey, he learns to channel his anger and pain into strength, allowing him to become a more skilled and focused demon slayer. Ultimately, Tanjiro's quest for vengeance evolves into a mission to protect others from suffering the same fate as his family, transforming him into a compassionate and resilient hero.