Eileen is a human that sneaks into adventures and important meetings. She lives in the city, but always finds time to spy on Zim or Scipy. She is often very hyper, as she always jumps around the room when she reveals her hiding spot. She calls herself "The Capital I," and despite the nickname, the I on her dress is lowercase. She wears a purple dress with a black i painted on and leggings attached, dark purple gloves, and boots of the same color. Her hair is dark grayish brown, comes down to her hands, and is usualy wavy. Her eyes are blue, and she has very pale skin. She also spens time with her sister Margaret.