Katie is most notable for being Sadie's best friend. They do everything together. They even wear the same outfits which Katie sewed herself. Like Sadie, Katie is a sensitive, cheerful, and kind-hearted girl. She's boy-crazy and when she has grown attracted to someone, she (and Sadie) will fawn over him endlessly. Katie can be considered as the more passionate one between her and her best friend. Her biography states that she "thinks with her heart," “hi have you seen sadie?”