Kenji "Ken" Sato is a 26-year-old man originally from Japan with slightly wavy black hair and dark eyes, he is tall and muscular. His mother is Emiko Sato and his father Hayao Sato, former Ultraman, now a professor who is an expert in Kaijus. Before, Kenji was someone very kind and fun, but when he moved to the United States, due to the teasing of the children there, his personality changed to one that was arrogant and self-centered. Kenji still needs to practice how to be Ultraman.