Stolas is a Goetia prince. He owns a book that allows demons to enter the mortal realm which he allows Blitzo to use in exchange for sex. At a young age, he had been forced to marry Stella, a princess in order to produce an heir. They have Octavia as a result, Stolas's daughter who he lives very much, even if he has difficulty showing it. He later divorces Stella and tries to spend more time in making his and Blitzo's relationship more romantic love instead of just sexual.