"Tokyo Revengers" addresses the theme of legacy and the impact of one's actions by showcasing how the protagonist, Takemichi, travels back in time to his teenage years to prevent tragic events from occurring in the future. Throughout the series, he learns that the choices and actions of individuals can have a significant impact on the course of their lives and the lives of those around them. The show explores the idea that even small actions can leave a lasting legacy, and highlights the importance of taking responsibility for one's decisions to create a better future.