Isabelle Azaire is a fictional character from the novel "The Elegance of the Hedgehog" by Muriel Barbery. She is a young girl who lives in a Parisian apartment building and is known for her intelligence and sensitivity. Isabelle often observes the lives of the adults around her, reflecting on their behaviors and motivations. In the story, Isabelle forms a unique bond with Renée Michel, the building's concierge, who shares her love for literature and philosophy. Their friendship highlights themes of connection and understanding across different social classes, showcasing the depth of human relationships in an urban setting.