Hal is a gifted scientist, possessing a high intellect in computer programming and mechanical engineering. A big fan of Japanese animation shows, especially that of the sci-fi and mecha genres, his hobby also gave him an optimistic inspiration and drive to help create new beneficial technologies and innovations for society with his genius, which was also reinforced with a sense of responsibility and level-headed perspective, especially during his experience of the Shadow Moses Incident. He also did not wish to create weapons of war, in particular weapons of mass destruction. He was also a selfless individual, willing to sacrifice himself to save Snake and Meryl.