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Brooke Mc Queen
Played by: Leslie Bibb
- Alpha Bitch: Though Brooke wavers with this trope and does have HiddenDepths, there are moments when she is ruthless
- Girl Next Door: To Harrison
- Mama Bear: Once she and Sam cede their warring and become close, Brooke is on the war path if anyone hurts Sam
- Not So Different: Shares this with Sam too, as they have a lot of similarities among their differences
- Parental Abandonment: Brooke's mother leaves her when she's a kid
- Weight Woe: Brooke is very skinny and suffers from anorexia due to her mother's abandonment
Sam Mc Pherson
Played by: Carly Pope
- Betty and Veronica: Sam's girl next door Betty and Brooke's troubled girl next door Veronica to Harrison's guy next door Archie
- Brainy Brunette: The editor of the school paper
- Holier Than Thou: Mostly in her war with Brooke, Sam can come across as thinking herself morally superior to even her own friends
- Hollywood Nerd: Despite being stunningly beautiful, Sam and her friends are designated "outsiders" and "unpopular", especially insecure about their bodies and putting the jocks and cheerleaders on physical piedestals
- Only Known by Their Nickname: Nobody calls her Samantha
- Platonic Life-Partners: Her and Harrison originally share this, but it changes when they profess their romantic feelings for one another
Played by: Christopher Gorham
- Boy Next Door: To the girls (Sam, Lil and Carm), although only to Sam in a romantic sense. Later to Brooke
- Deadpan Snarker: Not afraid to call people on their stuff, but also sometimes taking his brutal honesty too far
- Hopeless Suitor: To Brooke, at first.
- Just Friends: Harrison shares this with Sam until she comes to terms with how she feels about him.
Played by: Tamara Mello
Played by: Sara Rue
- Abusive Parents: Her mother is an alcoholic and Carmen attends an AA support group
- Fat Girl: Most of Carmen's story is based on her being rejected because of her weight and how shallow her fellow high school students are, though this is also subverted by having Carmen achieve her goals and become happy in some instances, and eventually best friends with the queen of the school, Brooke, as well as Carmen herself being accused of acting like she's a notch higher up the popularity hierarchy than eg. April Tuna
- Weight Woe: Carmen confides in Brooke that she suffers from overeating, which is a result of her family's verbal abuse
- Abusive Parents: Nicole's mother is a cold, body-shaming, patronising menace
- Beta Bitch: Though actually an alpha-in-disguise towards Brooke anyway
- Weight Woe: Nicole is obsessed with being the media ordained body size, which she learns from her abusive mother. This leads to her use of elephant laxatives at one point, but throughout the series she body-shames all the other students at the school.
- The Vamp
Played by: Leslie Grossman
Played by: Bryce Johnson
- The All-American Boy: Quarterback, head of the high school football team and MVP. Blond
- Beta Couple: With Lily
- Book Dumb: There are a lot of moments where Josh doesn't understand things, scholastically, which is set in contrast to Lily's intelligence and understanding of activism for the betterment of society
- Chick Magnet: Romantic situations with both Brooke, Sam, Nicole, Carmen and Lily.
- Lovable Jock: A good-hearted quarterback, who has a true passion for theatre.
- Really Gets Around: The girls refer to him as a not nice slur after finding out that he slept with Nicole
Sugar Daddy (Michael Bernardino)