Millie is a very lively and cheerful proud plus size imp woman. Often with a smile and rarely standing still, she is a clear extrovert and is not afraid to speak her mind, regardless to whether it's expressing her excitement or flipping off a co-worker. She loves her job and savors bashing targets' heads in. However, she has some issues about how she sees herself, confessing how she sometimes does not feel appreciated enough and how she wants to be seen more than just a "killing machine".