Popōca is a ghost that appears out of bonfires. He debuted in Cactus McCoy and the Curse of Thorns.
McCoy took the Thorned Emerald and inherited the curse just like Popōca did. He is a guide that McCoy trusts.
A very long time ago, Popōca succumbed to the deadly Curse of Thorns. His spirit was released when Cactus McCoy took the Thorned Emerald and its curse. Popōca is now McCoy’s trusted spirit guide on his adventures. He can appear wherever smoke rises.