11. Deandra “Sweet Dee” Reynolds, as seen on the show It's Always Sunny in Philadelphia, portrayed by Kaitlin Olson
Deandra Reynolds is a fucking terrible person. She's selfish, alcoholic, offensive, politically incorrect, and sometimes downright sociopathic. And it is for all these reasons that I absolutely love her.
Dee is the only main female character on It's Always Sunny, and in a show full of terrible people (and Charlie), Dee consistently matches these guys in sheer horrendousness. There's her plot to fake marry her adopted father to convince her biological father to give her an inheritance; there's the time she and her brother started smoking crack so they could go on welfare; and, of course, my personal favorite: the time she threw a funeral for her fake baby so she wouldn't be audited by the IRS. Dee sometimes serves as the voice of reason, but generally she's just as morally bankrupt as any other male character on the show, which isn't something you really see for female characters. Almost always, women serve as the conscience in ensemble comedies but not Dee; Dee is just a straight up perpetrator of terrible.
And that's pretty kick-ass.