Charlotte E. Yeager is one the 501st Joint Fighter Wing from the Liberion Forces. She is the queen of speed.
Charlotte is a member of the 501JFW Strike Witches, she seems to have a close friendship with Lucchini, acting like a sister figure. She is obsessed with her large bust, and she has a thing for speed, having broken the land speed record and later in the series she brakes the sound barrier while flying.
Charlotte E. Yeager is featured outside of the Strike Witches anime/manga in several ways. She has several anime figures in production by both the ALTER Corporation and Amie-Grand companies, a example of the ALTER Corporation's Charlotte E. Yeager figure is below: