Gertrude is a hag who does business in the back-alleys of the Chicago Goblin Market. She is a short, broad woman "with a hunched back," "red eyes and an enormous nose above jagged yellow teeth," and she wears "tattered robes and an ancient, floppy witch's hat."
In September of 2010, Gertrude met with John Manuelito. Their conversation was witnessed by Alexandra Quick, who mistook the hag for Hilda. In December of that year, Gertrude lent Quick eight Lions in exchange for Quick's Glamour mirror on the condition that Quick repay the loan with fifteen Lions.