Hal Emmerich, also known by his nickname Otacon, is a prominent character in the Metal Gear Solid series. He is a brilliant scientist and engineer specializing in robotics, particularly in the development of Metal Gear REX. Despite his initial naivety, Hal becomes a crucial ally to the protagonist, Solid Snake, using his technical expertise to support missions against various threats. His backstory is marked by personal tragedy and a passionate belief in using technology for peaceful purposes, which drives his ongoing efforts to prevent the misuse of his creations.