| Spoiler warning!|
This article contains plot details from the latest books.
Iggy is Sophie Foster's pet Imp. She rescued him in Keeper of the Lost Cities when he was stuck in the mouth of a Verminion (aka Hamsterzilla) as prey. At first, Grady protested to keeping Iggy because imps can be troublesome (one destroyed his tree house when he was a kid) but he quickly gave in and let Sophie keep Iggy when he saw how much Sophie loved Iggy. Biana likes to keep Iggy at Everglen and likes to give him makeovers, turning his fur different colors.
Iggy originally had black wings, green eyes, and gray fur, when Sophie first found him.
In Exile, Dex gives Iggy an elixir, turning Iggy's fur pink and curly. Dex later turns Iggy's fur orange with dreadlocks during Everblaze, blue in Neverseen, purple in Lodestar, and green in Nightfall. In Flashback, Shannon Messenger has announced that Iggy's new appearance will be yellow and sparkly, as voted by fans.
Iggy has the famous "Iggy Breath," which smells horrible due to his stinky diet. He likes to curl up with Sophie at night and play. One of his favorite places to be petted is his tummy. Iggy is described to have "chainsaw snoring," said by Sophie.
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, as Grady has stated.
- Iggy's "Purple Reign" is most likely a reference to Prince, with his famous song, "Purple Rain".
- Shannon Messenger had people vote on what they wanted Iggy to look like in the 7th book. Sparkles won by a landslide while it was very close between red and yellow for the coloring.
- The pink dancing Iggy probably refers to Iggy Azalea.