One of the last descendants of the Ackerman, a clan of people with superhuman abilities and the innate need to protect their masters. After losing her parents, she was adopted by a family and joined the Survey Corps along with her new adoptive brother. She's cold, serious, quiet and known for being often expressionless like a doll but also the most skilled soldier of the Survey Corps. She's always seen wearing the red scarf her brother gave her and is specially caring, almost obsessed with him.