Isabelle Lightwood is a fictional character from the The Mortal Instruments series, written by Cassandra Clare. She is a Shadowhunter, a member of a group dedicated to hunting demons and protecting humanity. Isabelle is known for her fierce personality, exceptional combat skills, and her signature weapon, a whip. As the daughter of Robert Lightwood and Maryse Lightwood, Isabelle comes from a prominent Shadowhunter family. She has a close relationship with her brothers, Jace Wayland and Alec Lightwood, and is often portrayed as a strong, independent woman who values loyalty and family above all.