In "Tokyo Revengers," the main character Takemichi Hanagaki has the ability to time travel to his past self. This power allows him to intervene in events and change the course of destiny. By altering past events, Takemichi challenges the idea that fate is set in stone and predetermined. The series explores how individual choices and actions can have a significant impact on the future, ultimately suggesting that one's destiny is not completely fixed but can be influenced by personal agency and determination.