She is the bad girl of Ian's class, shown to be as a true side born of the tracks, Mandy also possesses a sweeter side to her.
She is put out as someone not to mess with initially when Ian Shameless uk mandy and lip dating not share the same feelings for her, but when she later discovers his sexuality, she agrees to act as his "beard", his fake girlfriend to help keep his sexuality secret.
Mandy is noted to be promiscuous and proud of it as she seduces Lip in the second seasonbefore agreeing to do the same to Jody in an attempt to break him and Karen up. Despite acting as Ian's beard, she has no idea that he is in fact having sex with her brother, Mickey. However, in the episode A Great CauseMandy tells Ian and Lip that she was impregnated by her father, who sometimes rapes Mandy when drunk. They decide to have a fundraiser to raise money for an abortion. By Just Like the Pilgrims Intendedshe had already had an abortion, and was having regular sex with Lipwho was at her place.
Mandy apparently wanted to form a relationship with him, but he was busy thinking about Karen's baby, which turned out not to be his. During Fiona InterruptedMandy tells Lip she thinks he should return home to his family, advice which he then follows. In addition, Mandy possibly has four other brothers other than Mickey.
Two of which joined Mickey when Ian was accused of attacking Mandy during Season 1. The other two joined Mickey when he tried to kill Frank in Season 2. Mandy is seen living in the Gallagher house, where she almost never wears pants.
She also asks Ian what he thought about Lip. At the end of episode 3, she was receiving oral sex from Lip, but when she tried to give Lip fellatio he refused. Earlier in the episode, Lip was conducting a sting against a blonde sex offender, who used Nair on his pubic hair.
Mandy notices that Lip is not aroused and that his hair is gone and she realizes he had been with someone else. Lip explains he was gathering evidence against the sex offender as Mandy storms out. Later we see that Mandy had gone to the sex offender's house and threatened she leave. Her brothers are digging a grave in her front lawn, which scares the sex offender who goes back inside to pack her things. The episode ends with her brothers selling Shameless uk mandy and lip dating grave site not wanting to waste it to be used to a few men with a dead body wrapped in a carpet.
The teaser for episode 4 reveals that Mandy has a half-sister, whom she will visit. At the beginning of the episode, Kevin and Veronicaand at the same time Lip and Mandy are having sex, a call comes in for Mandy and Mandy stops Lip for a moment, but after finding out about her sibling.
Lip asks if he should continue and they do. She and Lip decide to go pick her up from a foster home in another state. Mandy does not seem very fond of her half sister to what she refers her to.
She does call her a sister when introducing her to everyone minus Carl who is on a camping trip at the time, and everyone gets in finding out she had another sibling. She lives at the Gallagher home at the moment, since Mandy tried to bring her to her aunt but her aunt refuses and tells her to take Molly back. It is revealed she has a penis when Debbie gave her some clothes to change in and unintentionally made the discovery.
There is a part of her that continues to search for a way out even though, like her brother Mickeyshe too believes that she is fucked for life. For a brief period she allows herself to believe that Lip is that way and finds herself going to great lengths to make that happen; including instilling herself in every aspect of his life and trying to be the perfect girlfriend so that Lip does not ever want her to leave.
Kevin quotes that she is Ghetto Married. Mandy tries to spend time with Lip while trying to find a new home for Molly.
Fiona has started asking Mandy during their brief encounters to help out around the house. She tries to help Lip on Kevin's Ice Cream truck Kevin is delighted and takes up her offer considering he has to head to The Alibibut Lip refuses her help. Out of frustration, Lip then tells her to go home, creating a small conflict between the two.
Mandy goes to her Aunt's home. Ian confronts Lip about the way he is treating Mandy and expresses that he needs to get over Karen and stop treating Mandy like Karen treated him.
He calls Karen and leaves an angry message stating various awful things Karen had done in past episodes. Lip finally comes to terms with the fact that he treated Mandy poorly and apologizes to her.
She forgives him and Lip blows off some fireworks him and Kevin intend to sell. He and Mandy sit up a blanket and enjoys the fireworks. Mandy and Lip's relationship is now much better. Later on, Karen returns and Mandy does not take it well but not enough that it only bothered her that she even spoke with Lip.
Mandy tries to sign Lip for college and she needed to steal a few things to do so. Lip, at first, does not take her help well, but eventually, gives her thanks by having sex with her and actually saying thanks. After Lip chooses her over Karen, Karen dislikes his decision and calls Mandy about a few sexual things with Lip. Mandy gets annoyed and insulted and grabs Lip's phone, unbeknownst to him.
Karen receives a text from Lip's phone. Karen assumes it to be another chance with Lip. As Karen enters the intersection of the street, a car almost hits her, and Karen puts her middle finger up at the car, only to have Mandy drive her car over Karenleaving her unconscious on the road.
The next day, Mandy is cleaning some blood and broken glass from the car. Mickey asked who she ran over, and Mandy only mentions that it was a girl from school. Mickey then gives her some advice about cleaning up the car. Lip begins to suspect Mandy after a visit to the hospital. Lip refuses to have Shameless uk mandy and lip dating with Mandy, making her upset.
Mandy, however, manages to do it in the kitchen after everyone had left for a camping trip. After seeing Karen in her state, Lip decides to go to Mickey's wedding, only to break-up with Mandy, who then reveals she gave a blow job to another guy after Lip's outburst. She is Shameless uk mandy and lip dating longer within a relationship with Lip.
Mandy is shut down when a drunk Ian reveals he's be sleeping with mickey. Things seem to have calmed down a bit since the break-up.