Diana Meade is a witch and the responsible, but strict leader of the Circle. Diana is good friends with Cassie Blake, despite the attraction between Cassie and Diana's long-term boyfriend, Adam Conant. Diana is the first member of the Circle to discover witchcraft and, as of the series' start, the only member to have found her family's Book of Shadows before Cassie found hers. She is also Cassie's younger half-sister through their father, John Blackwell. She also has dark magic and Balcoin blood.