Mimi Sentry is an anthropomorphic, female version of the red team Engineer's Mini-Sentry.  Her right hand is a sentry gun instead of a normal hand and her left eye is a tracker lense for precise aiming, but it can also fire a devastating laser beam that even she is surprised about.  Mimi Sentry's entire body is made of metal, including her outfit.  She is around the size of a 10-year-old girl and does not give crap to her enemies.  She is dedicated in taking down anyone she deems a threat.