She has blue eyes and wears a black skirt, knee-high socks and a pair of mary janes, and a blue shirt depicting a star. She has straight red hair, held with a star-shaped clip, and wears square eyeglasses. She is seen three times without her glasses. She tends to be more jaded and cynical than Mary, which often leads to her downfall. Susan's emotions are more extreme than her twin's, and she tends to be more impulsive. Eugene/Bling-Bling expresses fond interest in Susan, often causing her to be used as a "bargaining chip" in his negotiations.