Deandra Reynolds
Deandra "Sweet Dee" Reynolds, or "Dee", is a fictional character on the FX television series It's Always Sunny in Philadelphia, She was played by Jordan Reid in the unaired pilot episode, and portrayed by Kaitlin Olson for the actual series. Dee was the only major character in the show to be conceived without an actor in mind. Although she was originally written to be a female voice of reason, Dee's character quickly became an equal participant in The Gang's illicit and morally questionable activities once Olson was cast.
Background
Dee is Dennis Reynolds' twin sister and is the main bartender at their bar, Paddy's. Dee was unpopular in high school due to her severe scoliosis, for which she wore a corrective back brace that earned her the nickname "The Aluminum Monster". Additionally, she is often ridiculed for her resemblance to a bird by the rest of The Gang, especially Dennis and Mac. She identifies herself as a liberal, and claims to be compassionate and smart; in reality, however, she is selfish, greedy, and prejudiced. Dee battles The Gang's view that "females are inferior" and feels that she must prove that she's as capable as her male friends. In "The Gang Gets Invincible", Dee poses as male alter ego "Cole" to try out for the Philadelphia Eagles with Mac and Dennis; she does a superb job and impresses the Eagle coaches until she stuns everyone by revealing she's a woman right before her punting tryout, after which she kicks the ball and severely injures her foot. Her father Frank is the only one who considers Dee a true member of The Gang. Whenever there is a decision or a vote among members of The Gang, the three other guys habitually exclude her.