6. Margo Martindale as Mags Bennett on Justified
Mags is the epitome of tough love. She manipulated her three sons into helping her control the drug trade in Harlan County, and in one memorable scene, beat her youngest's hand with a hammer when he stepped out of line. She also poisioned the father of a local teen Loretta for barely any reason at all and took her in under false pretenses because she had always wanted a daughter of her own.
Despite her overbearingness, Mags genuninely cared for Loretta and the favoritism showed, inciting a jealous streak among her emotionally deprived sons that led to two of their deaths. For some strange reason, when Loretta discovered the truth she wanted absolutely nothing to do with the Bennetts anymore. We have no idea why.