Greifen is a character from the anime series 'Frame Arms Girl,' which is based on the model kit line by Kotobukiya. Greifen is one of the Frame Arms Girls, which are autonomous robots capable of learning and adapting. She is known for her distinctive appearance, featuring a military motif with a focus on heavy artillery. Greifen's personality is often depicted as cool and collected, and she excels in tactical situations. In the series, she plays a role as one of the competitors in battles, showcasing her strategic prowess and formidable combat abilities.