Katie starts with no siblings but ends up with a slightly-younger step-sister named Emily when her mom marries a man named Jeff Green.
Katie is very nice and sweet, and is often unassuming in that she always thinks the best of everyone. She is funny and can take a joke, but hates being teased. She's also quiet and shy around new people.
She has a crush on goofy George Martinez, who is universally known to like her back.
Katie is described to be very cute. She has light brown, wavy hair with natural highlights that is said to get tangled very quickly and easily, which she often wears down. She has hazel/brown eyes. She is also supposedly pretty skinny and lanky, not very muscular.
Katie's sense of style could be described as comfy casual; she often wears t-shirts and jeans or shorts, has no interest in fashion, and is sometimes quite messy. She also wears lots of DIY'd shirts, such as ones with self-applied decals and tie-dyes.