Carmen is a transgender woman who was dating Mac, much to his nervous embarrassment. She later had sex reassignment surgery and married Nick and the two had Dee act as the surrogate mother for their baby (Carmen being the sperm donor; Nick says he is unable to have children).
Carmen is a recurring character, appearing in three seasons. She is portrayed by Brittany Daniel.
Carmen is a transgender woman who, until Season Six following her operation, had a noticeably large and thick penis, causing sexual confusion for Mac("Mac Fights Gay Marriage"). Mac flirted with her intently before Dennis pointed out her penis to him. From then on, whenever he was with her he was constantly cautious of her waist.
Carmen is first seen flirting with some men in Paddy's Pub. She is open about her status as a trans woman, even when people are ridiculously offensive, most especially The Gang themselves. Carmen was frustrated Mac was ashamed of their relationship, to the point where his friends thought he was a serial killer because he was acting so strangely. After her surgery, Carmen did not call Mac as he wanted her to and married Nick instead, as he is exponentially more understanding and tolerant.
Mac starts flirting with Carmen at Paddy's, thinking she would be a perfect girl to have sex with Charlie to cheer him up. Dennis points out that she has a penis. Mac approaches her, asks her about it. She owns up to it and starts to compliment his arms. He becomes enamored by her and asks to call her sometime. They hang out many times, to Dennis' disgust, because Mac wants to be first in line when she has her surgery. On one date, she tapped him on his shoulder, surprising him, as a reflex he punched her in the face, some witnesses then threatened him for beating a woman, so he resorted to calling her a man before running away from witnesses. ("Charlie Has Cancer")
Mac runs into Carmen at the gym, where he finds out she has had sex reassignment surgery and has married. She introduces him to her husband, Nick. Mac becomes upset that she did not call him after having her operation and decides to fight gay marriage in order to break them up. His efforts do not work. ("Mac Fights Gay Marriage")
After Dee gives birth, she reveals that she'd been impregnated by Carmen's sperm (which she had frozen before her transition), and had acted as a surrogate mother for Carmen and Nick. She immediately gives her baby to the happy couple. ("Dee Gives Birth")
Carmen was originally played by Morena Baccarin in the unaired pilot.
When Baccarin portrayed Carmen, her penis was actually smaller and less noticeable during the pilot.
Dennis claims that Carmen's realistic breasts are implants.
In an interview with GQ in 2018, Glenn Howerton said this about the character of Carmen: "I mean, there are a few things, that if I could go back, I would probably do differently. In the first couple seasons, we referred to a character as 'the tranny.' Personally, I wasn't as aware of the power of that word at the time. Now, granted, I think one of the reasons why we get away with it or why it makes sense is because the characters are awful people. They're not celebrated for it and they always lose and they always get their comeuppance, and I think that's important. But I think if I were to do it all over again, there would probably have been at least one person in the group to say like, 'You shouldn't use that word.' I know our hearts were always in the right place and we never wanted to offend anybody. And still, our intention is never to offend."