Characteristics
Susan is a 13-year old super genius and twin sister of Mary and the older sister of Johnny. Susan has been shown to be less empathetic and sympathetic than her sister. Like her sister, Susan herbs a deep love and obsession for Gil.Bling Bling Boy has a huge crush on Susan but whenever he tries to get her to fall in love with him it always fails. Like her sister, she attends school at the Mega Institution of Geniuses. Susan is prone to believing in the more scientific and less science-fictional, which although gives scorn to her twin, Mary often proves to be correct in the end. Susan seems to be less level-headed than her twin Mary, and Susan tends to be less conservative, as she speaks her mind much more than Mary. She is the younger of the two.
Appearance
She has completely straight red hair and wears square glasses. She wears a shirt with a star on it and she is sometimes seen wearing a star-shaped barette in her hair. She one day hopes to meet a star. She is always seen wearing a lab coat, black skirt and pumps with her trademark star-shirt, and black Mary Jane shoes. She sometimes wears a turquoise one-piece bikini. She first appeared in Johnny to the Center of the Earth.