Born April 25, 2036, at Grace Field House, Anna transferred to Plantation 3 in 2037. She grew up under Isabella's care as one of the orphanage's "good quality goods," identified by the neck tattoo "48194." Physically, she possesses fair skin, light blue eyes, and a petite build. Her long blonde hair was initially styled in twin braids. She cut it to shoulder-length to aid Ray's rescue during the Grace Field escape; afterward, she often wears it in two short pigtails or a ponytail. She wore the standard Grace Field uniform—a white button-up shirt, white skirt, and brown boots—before adopting a long black skirt and white shirt post-escape. By 2047, she grows taller and experiments with different hairstyles, including braids and ponytails.

Characterized by a gentle, kind, and protective nature, Anna deeply cares for her siblings and willingly makes sacrifices for their safety, like cutting her hair for the escape plan. She enjoys gardening, reading, sewing, and caring for younger children, gradually evolving into a motherly figure. Despite her calm demeanor, she demonstrates determination and rational thinking, such as insisting on joining a dangerous mission to steal medicine despite limited combat experience. Her empathy leads her to comfort others during distress and provide medical aid to injured allies and strangers.

Anna learned the truth about Grace Field House from Don and Gilda, joining the escape plan alongside Nat, Thoma, and Lannion. She assisted preparations by sewing ropes and creating a decoy for Ray using her severed braids. After fleeing, she survived in the wilderness with her siblings, taking refuge in Shelter B06-32 and forming a bond with resident Mister. During Andrew's attack on the shelter, she helped tend to the injured Chris.

Later, she volunteered for the mission to raid a demon farm for medicine, emphasizing her medical skills and the need to protect the group's strongest members. She navigated the farm's dangers alongside Emma and Ray, demonstrating adaptability in hostile environments. After reaching the human world, she attended school and studied medicine intensively. In 2049, she reunited with Emma, who had lost her memories, fulfilling her dream of wearing varied clothing.

Anna honed significant medical proficiency during her year of study with Lucas, learning to prepare remedies, administer surgery, and handle emergencies like treating Emma's ear injury and aiding Hayato and Jin. She demonstrates adaptability in survival skills across changing environments, from Grace Field to the human world.