He was the snake that tempted Eve in the Garden of Eden, and thus his human form also has snake eyes, which he usually covers with designer sunglasses. He is Aziraphale's best friend and life partner. Aziraphale seeks to prevent the apocalypse because he has grown to like humans and enjoy his life on Earth. There are restaurants on here, for a start. Furthermore, he does not find the idea of listening to The Sound of Music for eternity very appealing. He is Crowley’s best friend and soulmate.