Lisa Berger, formerly known as Lorraine, is a shy looking girl who first appeared in the Season Sixteen episode, "Butterballs", where she was seen at the school assembly with Bucky Bailey's Bully Buckers.
During the assembly, the spokesperson for Bucky Bailey's Bully Buckers bullied her by asking if kids say things like "Nice pants, why do you wear them up to your tits?". Lorraine also appeared in "Cartman Finds Love" in the background when Token Black was pushing Nichole on the swing.
Lisa has messy brown hair. She wears orange pants, a purple shirt, white socks, and black shoes. Her pants are worn above the waist. She has freckles on her face and also wears yellow glasses.
Lisa has a crush on Butters in "The Hobbit". While the other girls tease her for it, Wendy encourages her to confidentially ask him out. Taking her advice, Lisa approaches Butters in the cafeteria and asks him out to go see a movie. While Butters appreciates her kindness, he rejects her on grounds that he's turned off by her weight. Lisa, having her hopes crushed, cries as she walks away.
After seeing a photoshopped image of Lisa going from overweight to beautiful, Clyde starts dating her, believing that her appearance actually transformed to how she's depicted in said photoshopped image.
Wendy appears to be great friends with Lisa, always willing to help her out in bad situations and defend her from those picking on her. They first interact in "The Hobbit", when they are part of the South Park Cows Cheerleading Squad. As the girls announce their names while doing Cheer Squad roll call, Lisa's voice comes out quietly and shyly as opposed to the other girl's. This leads the girls to being dissatisfied with her presence and demanding that they do one without Lisa.
Wendy defends her, encouraging her to boost her self-esteem, lose her insecurity, and show off her sassiness to boys. The other girls reveal that Lisa has a crush on Butters and start teasing her because of it. Angered from their bullying, Wendy advises her to ask him out. After Butters rejects her, Wendy angrily confronts him, stating that Lisa is very nice and therefore he should care more about her personality rather than her appearance.
- "Butterballs" - Seen being made fun of by the Buckey Bailey at the school assembly.
- "Cartman Finds Love" - Seen in the background on the playground eating.
- "World War Zimmerman" - Seen performing as a cheerleader at the school assembly.
- "The Hobbit" - Becomes the most popular girl in school, and Clyde Donovan's girlfriend, after Wendy uses Photoshop to "improve" her appearance, despite doing so to try and prove a negative point to Butters Stotch about its deceptive effects.