Based on the original Frame Arms line, Frame Arms Girl features the robots from that line re-portrayed as anthropomorphic mecha musume, known as F.A. Girls for short, who can be equipped with various armor and weapon parts, including mixing and matching those from other original Kotobukiya kit lines, Frame Arms and the M.S.G accessory series included. The end result resembles a doll or figure with accessories attached, ranging from heavy armaments to articles of clothing, sold at the size of 1/1 scale for lore purposes, but translate to 1/10 by default and 1/24 scale for handscale versions when compared to the human body. The line's initial character design was illustrated by Fumikane Shimada, loosely inspired by Takayuki Yanase original Frame Arms mecha designs, but has since expanded to commission other artists to help on new F.A. Girls.