In "Tokyo Revengers," the characters confront issues of mortality and legacy through their experiences with gang violence, time travel, and redemption. The main character, Takemichi, grapples with the mortality of his friends and loved ones as they get caught up in dangerous situations within the gang. This drives him to try and change the past to prevent their deaths and leave a positive legacy for those he cares about. Other characters also face their mortality head-on, reflecting on their actions and the impact they will leave behind. Ultimately, the characters in "Tokyo Revengers" navigate complex themes of mortality and legacy as they strive to create a better future for themselves and those around them.