Takemichi's growth and development in Tokyo Revengers is central to the overall narrative as it serves as the backbone of the story. His personal growth from a timid and indecisive person to a more courageous and determined individual drives the plot forward and influences the actions of other characters around him. His journey of self-discovery and transformation not only affects his own life but also has a significant impact on the relationships and conflicts within the story, ultimately shaping the course of events in the series.