Lacia is a central character in the anime series "Beatless." She is an advanced, humanoid android known as an hIE (humanoid Interface Element) designed with a near-human appearance and equipped with an artificial intelligence that allows her to think and act on her own. Lacia is discovered by the protagonist, Arato Endo, and becomes his partner. As the series unfolds, Lacia's mysterious origins and her true purpose become key plot points. Her interactions with humans raise important questions about the nature of humanity and technology, making her a pivotal character in the exploration of these themes.