Greifen is a character from the anime series "Frame Arms Girl." She is a Frame Arms Girl, a type of small, autonomous robot designed for combat and equipped with advanced weaponry. Greifen is known for her sharp intellect and strategic mind, often serving as a tactician in battles. Her design is inspired by military aesthetics, featuring a robust and armored appearance. Despite her formidable abilities, Greifen has a curious and inquisitive nature, often seeking to understand the world around her and form connections with her human owner, enhancing her role in the series.