Iggy is Sophie Foster's pet Imp. She rescued him from the Verminion in Keeper of the Lost Cities. At first Grady protested to keeping Iggy because Imps can be troublesome but he quickly gave in and let Sophie keep Iggy when he saw how much Sophie loved Iggy.
Iggy has black wings, green eyes, and gray fur.
Iggy has famous "Iggy breath" which smells horrible. He likes to curl up with Sophie at night and play. One of his favorite places to be petted is his tummy. He enjoys playing with his pink curls.
During Book 1 Sophie learned to talk telepathically to Iggy and give him simple commands. Under Sophie's instruction, Iggy tried to help Sophie by biting the Neverseen agents who kidnapped her. Imp bites are venomous but not deadly.
- Iggy's "Purple Reign" is most likely a reference to Prince, with his famous song, "Purple Rain".