As a kind of coming-of-age story with the theme of narrating the growth of characters, Bildungsroman mainly reflects the protagonist’s mental journey after a series of challenging events. This perspective has been widely used by scholars to interpret characters in literary works. This paper creatively applies this perspective to character analysis in Japanese epidemic film I am a Hero . The thesis makes an in-depth discussion on the protagonist image in the film from multiple structural elements of the Bildungsroman, such as people guiding the way and spiritual construction of personal consciousness, then analyzes the process of protagonist Hideo’s spiritual growth and finally summarize the characteristics of Bildungsroman.