M4A1 is the main protagonist in the anime series Dolls' Frontline. She is a Tactical Doll (T-Doll), specifically a highly advanced assault rifle model, and the leader of the elite 'Anti-Rain' team. M4A1 is characterized by her strong sense of duty and tactical acumen, often standing as the backbone of her team. Throughout the series, her character development is significant as she learns to overcome self-doubt and make crucial decisions in the battle against Sangvis Ferri forces. Her leadership skills and unwavering determination make her a pivotal figure in the unfolding narrative.