Zap was a shiner who joined the quest team looking for the Bane. She, along with Photos Glow-Glow made nuisances of themselves by often demanding food and even selling them out to the gnawers. She and Photos Glow-Glow argue all day.
After being run out of their land by the slimers, Zap and Photos Glow-Glow reside in Hades Hall. Gregor, along with Boots, Luxa, and others, encounter them again in The Marks of Secret. In exchange for cake, they agree to provide them with light as they make their way through Hades Hall.
At the end of The Code of Claw, they find Gregor, severely injured, and carry him back to Regalia, saving his life.