Destiny plays a significant role in Takemichi's quest to change the past in the anime series "Tokyo Revengers." Despite his efforts to alter the course of events and prevent tragedies, he often finds himself facing obstacles and challenges that seem to be predetermined by destiny. This theme of fate versus free will adds depth to the storyline, as Takemichi struggles to navigate between changing the past and accepting the inevitable outcomes dictated by destiny. Ultimately, the series explores how one's actions and decisions can influence destiny, but also how some events may be destined to occur regardless of efforts to change them.