Barnaby is introduced as a polished and highly capable hero, initially partnered with Kotetsu. His evolution throughout the series, from a loner to a more emotionally open and trusting hero, is central to the narrative.
Kotetsu is introduced as a seasoned but somewhat washed-up hero in a world where heroes are public figures, sponsored by corporations. He takes on a new partner in Barnaby Brooks Jr., and his journey shows his growth as a mentor and father figure.