Marilyn A. Mercury is the main female protagonist of Devil's Rising. She is a prodigal Human Magician who was 9th seat in Spriggan 13, elite guards under the order of Emperor Spriggan in the Alvarez Empire. Due to her incredible prowess over magic & sorcery, she earns several nicknames such as "The Crimson Magician" or "Grand Magister Nine". She was also given the epithet within the Alvarez Empire, which it was "Hybrid Theory", stemming from her use of eight different Dragon Slaying Lacrima.