Rosemarie DeWitt as Charmaine, Tara's sister. She resents Tara for always being the center of attention and accuses her of only acting out her personalities. Cody wrote Charmaine as an antagonist because she wanted "a voice for the skeptics".[1] She worked for a mail-order vitamin company before an incident involving one of Tara's alters caused her to lose her job. Her first husband pressured her into getting breast augmentation surgery, which resulted in deformed, lopsided breasts. She undergoes corrective surgery, and starts to bond with Buck, who takes care of her while she recovers.