Penelope Bunce is the daughter Mitali and Martin Bunce out of few siblings, one of them being Premal; one of the powerful Mage's Men. Her family owns a great library which is suggested may have books forbidden by The Mage's reforms. She is also the stupidly brave best friend of Simon Snow, and is always seen by his side.

Along with her fierce attitude is her curiosity, known for getting herself and sometimes Simon into dangerous situations. She is said to be powerful magically, and extremely smart throughout the book.