Isla is a calmly cold, inexpressive and unmerciful woman. She feels no pity for anyone, not even for her adoptive father who involuntarily transmitted to her his fascination for occultism and witchcraft. She's intelligent and well organised, perfectly knowing and mastering dark rituals, possessions and creations of totems which makes her a really dangerous adversary. We can seeing her as the opposite of The Warrens, especially Lorraine with who she has similarities.