Heiji Hattori is a fictional character from the popular Japanese manga and anime series Detective Conan, also known as Case Closed. He is a high school detective from Osaka and is known for his sharp intellect and impressive deductive skills. Heiji often assists the main character, Shinichi Kudo, in solving various mysteries and crimes. Heiji is characterized by his friendly and outgoing personality, often displaying a strong sense of justice. He wears a distinctive black hat and is skilled in martial arts, which helps him in dangerous situations. His rivalry and friendship with Shinichi add depth to the storyline, making him a beloved character among fans.