Katie is most notable for being Sadie's best friend. They do everything together, even wear the same outfits. 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. Katie is more independent and capable of making decisions on her own. However, given her thinking habits, they don't always turn out to be wise.