Mrs. Potter (no first name known), frequently called just Mrs. P., is a major precog. Besides being Dunwich's delegate to the Whateley Board of Supervisors, she seems to be an adviser to ARC and any number of other organizations. She was a teacher at Whateley for years before retiring. Mrs. Carson has muttered at least once that her forecasts are keeping her from effectively running Whateley.
She's been known to leave messages for people, sometimes years in advance.
- Margaret - daughter