Her first appearance in "The Ungroundable " was sitting in the gym with the vampire children, she later helps Mike and the vampire kids to transform Butters into a vampire. That was her only important appearance for now.
In "Goth Kids 3: Dawn of the Posers " she was seen during the meeting.
Katie wears a black undershirt under a black jacket with white accents and a drawing of a skeletal cat on the right, black pants with loose black suspenders and black shoes. She has short gray hair with brown highlights, black eyebrows and a lot of makeup.