Artemis's alter ego. He makes his appearance in the 7th book, The Atlantis Complex, when Holly zapped Artemis with her Neutrino, and when shocked by Amorphrobots . Orion has a guilt-free, unrealistic, confident personality, with all of Artemis's memories and knowledge but none of his guilt. Orion is also free from the other symptoms of Atlantis Complex, including Artemis's irrational fear of four (which sounds like the Chinese word for 'death') and his belief of five as a lucky number.