She is the twin sister of Stevie Smith. At first glance, the two appear to be perfectly in sync with each other - they have their own handshake, constantly compliment each other, and call each other "bro" - but there is often conflict between them, usually caused by their fights with the main characters, which shows that their bond is not as close as it may appear to be.
Suzie has long blonde hair in a braid, tied up with a blue hairtie. She wears two earrings. She wears a white jumpsuit with an orange chevron on the front and a blue belt with a yellow diamond-shaped buckle on it.