Eileen is a character from Regular Show. She's brainy and helped saved her friend's lives, a few times. She works at a coffee cafe. Her friends are Margaret, Mordecai and Starla. She has a crush on Rigby. Eileen grew on Rigby as time went on and he since then, he cared for her as a friend. Possibly more than that since he thinks Eileen looks hot without her glasses.