Shelby

Shelby is one of Carter and Sadie's students. She is the youngest one. Like all of the ankle-biters, the youngest students, she is at the Brooklyn House with her parents' consent. She is already skilled in magic. Her crayons occasionally morph into weapons, and her drawings tend to peel off the page. It is mentioned that she created a red, white, and blue unicorn for the Fourth of July.

The Serpent's Shadow
Shelby appears in the beggining of the book, where she shows Carter and Julian her drawing of a dead serpent with knives sticking out of its back.