Shinjirou Hayata is the main protagonist of the anime series 'Ultraman.' He is the teenage son of Shin Hayata, the original Ultraman. After discovering his inherited superhuman abilities, Shinjirou becomes the new Ultraman to protect Earth from alien threats. As he struggles to balance his ordinary life with his responsibilities as a hero, Shinjirou develops a strong sense of justice and courage, gradually embracing his role in the legacy of Ultraman and facing numerous challenges and enemies.