Lannie has brown hair that is tied with a red hairband into a bun. She wears a lime sweater and pink pants.
Lannie has been seen together with Meagan Ridley at several occasions, most notably at the Yo Gabba Gabba Live! show in "Taming Strange", and walking with her in the school hallway in "The Cissy". It can be assumed that they are close friends.
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- "The List" - Seen in the Pleases and Sparkles Club.
- "Breast Cancer Show Ever" - Watches the fight between Cartman and Wendy.
- "The Ring" - Seen in the Jonas Brothers concert.
- "Reverse Cowgirl" - Seen cheering Clyde Donovan up with her friends (deleted scene only).
- "Jewpacabra" - Seen in the Easter Egg hunt.
- "Butterballs" - Seen in Stan's anti-bullying video, wearing a Cows mask.
- "Let Go, Let Gov" - Seen in the school hallway.
- "Informative Murder Porn" - Participates at the meeting.
- "World War Zimmerman" - Seen at the Park County Community Center assembly.
- "Taming Strange" - Seen at the Yo Gabba Gabba! Live show with Meagan.
- "The Hobbit" - Seen at the school assembly"
- "The Cissy" - Seen in the school hallway with Meagan.
- "Stunning and Brave" - Seen at the meeting in the school cafeteria.
- "Where My Country Gone?" - Seen at the school playground.
- "The City Part of Town" - Part of the choir put together for the Whole Foods Representative.
- "You're Not Yelping" - Following a raid at Whistlin' Willy's, she was seen in the school hallway fearing of Eric’s presence.
- "Tweek x Craig" - Seen watching the fight between Tweek and Craig.
- "Skank Hunt" - Seen comforting Bebe after Heidi Turner quits Twitter .
- "Wieners Out" - Watches the girls' basketball game.
- "Douche and a Danish" - Seen watching Nelly fight with Butters.
- "Fort Collins" - Seen in a photograph on the wall of Heidi's bedroom.
- "Oh, Jeez" - Seen in the school assembly.
- "Put It Down" - Seen in the school hallway.
- "Hummels & Heroin" - Seen at the party where Peppa Pig died.
- "The Scoots" - Seen sitting with the other girls at lunch.
- "Time To Get Cereal" - Seen in the crowd outside the school.
- "Bike Parade" - Seen at the bike parade.
- "Let Them Eat Goo" - Seen in the South Park Elementary Cafeteria.
- "Board Girls" - Seen in the Board Girls Gaming Club.
- "The Pandemic Special" - Seen in quarantine at school with the other students.
- "Pajama Day" - Seen in the school hallway.
- "The Big Fix" - Seen in the school bus.
- "Back To The Cold War" - Evacuated into the South Park Elementary Gymnasium with the other children.
- "Credigree Weed St. Patrick's Day Special" - Appears at the school lobby, witnesses Butters getting arrested for sexual harassment.