She has black hair. She wears a light orange, long-sleeve shirt, a blue vest, and a short brown skirt. She also has green hair ties, which she uses to put her hair into two puffy pigtails. She is currently the only known student to wear a vest.
Kind, liberal, and defensive, Theresa is insecure about her family's financial situation and living in a trailer, which she prefers to call a "tiny home." She is sensitive about her family's successes, or rather the lack thereof, so she makes the claim that her family only downsized to benefit the environment in an attempt paint a better picture of her unfortunate familial status. She is liberal, and cares a great deal about the environment, acquainting a person's successes with their treatment of the Earth. She is very defensive and is persistent in her efforts to cover up or sugarcoat the things about herself she isn't proud of.
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- "The List" - She was shown as a member of the List-making committee.
- "Tonsil Trouble" - Seen in the background on the playground.
- "Super Fun Time" - Seen as Allie Nelson's partner during the field trip.
- "Elementary School Musical" - She was shown singing and dancing.
- "The Ring" - Seen at the Jonas Brothers concert.
- "Butters' Bottom Bitch" - Seen in the school's playground.
- "Ass Burgers" - Cartman sells her a burger.
- "1%" - Seen in Clyde Frog's funeral.
- "Butterballs" - Seen at the school assembly.
- "Cartman Finds Love"
- "A Scause For Applause" - Seen in the background in the school hallways talking to Kevin Stoley.
- "Let Go, Let Gov" - Seen in the playground.
- "Informative Murder Porn" - Seen in a town meeting at the Community Center.
- "World War Zimmerman"- Seen on the playground turning the jump-rope for Butters.
- "Taming Strange" - Briefly seen in the background in the lunchroom.
- "Gluten Free Ebola" - Seen at the boys' big party, talking to Kelly Pinkerton-Tinfurter.
- "Stunning and Brave"
- "The City Part of Town"
- "You're Not Yelping" - Seen in the hallway.
- "Truth and Advertising" - Seen in the cafeteria.
- "Member Berries" - Seen at the school assembly.
- "Skank Hunt" - Seen With The Recess. Later Conspires with her fellow female classmates to get back at the boys for Skankhunt42's Misdeeds.
- "Wieners Out" - Seen in the stands at the volleyball game.
- "Douche and a Danish" - Seen in the battle between the girls and the boys.
- "Put It Down" - Seen at the amusement park with Louis.
- "Hummels & Heroin" - Rallies with Marcus Preston after witnessing his presentation in the school cafeteria.
- "Doubling Down" - Later takes Heidi out to eat with the other girls. Teases her for her relationship with Cartman, although playfully, she makes very harsh comments and unintentionally hurts Heidi's feelings.
- "Moss Piglets" - Eats with the girls at lunch. Teased by Heidi at the bus stop for living in a trailer park.
- "SUPER HARD PCness" - Seen running to the gym with the students.
- "The Problem with a Poo" - Seen in the school band and at the school assembly.
- "The Scoots" - Seen in the Halloween Outlet.
- "Time To Get Cereal" - Seen in the school's playground after evacuation.
- "Bike Parade" - Seen at the bike parade.
- "Let Them Eat Goo" - Seen in the assembly and in the cafeteria.
- "Tegridy Farms Halloween Special" - Seen at the school assembly.
- "Board Girls" - Seen at the school assembly and at the Board Girls Gaming Club.
- "Turd Burglars" - She and her parents go to Tom Brady's house to get his "spice".
- "Basic Cable" - Seen entering the school.
- "The Pandemic Special" - Seen in quarantine at school in one of the classrooms.
- "South ParQ Vaccination Special" - Seen at South Park Elementary hall.
Theresa is one of the girls who attended a meeting in the Pleases and Sparkles Club.
- ""South Park" T.M.I. (TV episode 2011)". IMDb.com.