She is the cheerleading captain at the fictional William Mc Kinley High School in Lima, Ohio, as well as a member of school's glee club.
In the first episode, Quinn is introduced as an antagonistic queen bee stock character.
In the third season, Quinn intends to get full custody of her daughter, Beth, and her attempts to prove Shelby Corcoran (Idina Menzel)—the adoptive mother of Beth—an unfit mother fail; eventually, she realizes that Shelby is Beth's true mother.
Quinn subsequently receives a college acceptance letter from Yale, and while driving to Finn and Rachel's wedding, her car is struck by a truck and she suffers a spinal injury that requires her to use a wheelchair for many weeks. Quinn was developed by Glee creators Ryan Murphy, Brad Falchuk and Ian Brennan.
Puck again offers to support her, but she turns him down and tells him that she wants to handle the pregnancy by herself.
When Sue forces Quinn, Santana and Brittany to choose between cheerleading and the glee club, all three initially go with the Cheerios to retain their popularity, but are later convinced by Finn to defect to New Directions.
Quinn cheats on Sam with Finn, and Sam dumps Quinn after she lies to him about her time with Finn.
She and Finn reunite, and Quinn starts campaigning for junior prom king and queen elections.
Finn later breaks up with Quinn when he realizes he has a deeper connection with Rachel.
At the start of her senior year, Quinn has completely reinvented herself and refuses to rejoin either the Cheerios or New Directions, although when New Directions performs "You Can't Stop The Beat" in the auditorium Quinn can be seen watching them with a conflicted look on her face.
Lauren Zizes (Ashley Fink), Puck's new girlfriend and one of Quinn's rivals for prom queen, discovers that before transferring to Mc Kinley High, Quinn was known by her first name, Lucy.