Ater Hresvelgr is a character from the anime series Frame Arms Girl. She is a Frame Arms Girl model, a line of customizable plastic model kits that come to life in the series. Ater is an advanced FA Girl with a sleek and powerful design, known for her speed and agility in battle. She plays a significant role as both a competitor and an ally, showcasing her strategic combat skills and adaptability in various scenarios. Her personality is calm and composed, making her a formidable opponent and a valuable team member.