A half-British, half-Japanese girl who comes from a rich family and was Alice's friend back in England. She also comes to Japan and enrols in Shinobu's school. She is very energetic, fun-loving and carefree, not even worrying about her grades or her getting fat. She is usually seen napping in her class even in test seasons. Karen is also seen to be obsessed with manga, as it is seen in some episodes that she is buying new volumes of manga. She often wears a Union Jack parka jacket over her school uniform and generally speaks in broken Japanese.