Katie is the same age as Nathan or Nate. She has black eyes and brown hair tied in a ponytail with a pink ribbon. She wears a white pullover over a collarless shirt with black and white stripes. A pink heart is on the right side of her pullover. She wears blue shorts. She wears dark gray socks and black tennis shoes with white soles and white shoelaces. When she is the player's chosen protagonist, she wears her Yo-kai Watch around her neck, which easily disguises the watch as a necklace with a watch pendant. This is in contrast to the way Nate wears his watch, on his wrist.