The wealthy, manipulative, and domineering "queen bee" of North Shore High School. Leader of The Plastics, alongside subservient members Gretchen Wieners and Karen Smith. She has perfectly styled, long blonde hair (which is actually a wig made of human hair in the original movie) and an overall striking, angelic look that masks her cold nature. Her wardrobe is the epitome of mid-2000s trendy fashion. She favors bright pink, short skirts, tight cardigans, and high heels. She frequently wears a distinct initial necklace featuring a prominent letter "R." The "Plastics" Dress Code: Regina strictly enforces rigid fashion rules for her clique. This includes wearing pink on Wednesdays, only wearing a ponytail once a week, and banning sweatpants on any day except Friday. Manipulative & Calculating: She is a master coordinator of high school social warfare. She knows exactly how to identify a person's deepest insecurities and use them to her absolute advantage.Charming but Icy: Regina can instantly switch on an enthusiastic, sweet facade to disarm people before backstabbing them. She routinely gives backhanded compliments to keep others feeling off-balance.Dictatorial: She demands total loyalty and submission from her friends, Gretchen and Karen. She treats them more like loyal subjects than equals and instantly turns on them if they cross her boundaries.Obsessed with Control: Regina thrives on being the center of attention. When she begins losing her grip on her social status and her physical appearance, her reaction is explosive, ruthless, and vengeful.

Signature Aesthetic: She frequently wears argyle sweaters, tight knit cardigans, and pleated plaid mini-skirts.Color Palette: Gretchen often wears warm tones, earthier pinks, deep berries, browns, and reds.Key Accessories: Gold jewelry and structured designer handbags. Notably, she is never allowed to wear hoop earrings because Regina claimed they were "her thing". Gretchen is the daughter of the inventor of Toaster Strudel, making her incredibly wealthy but deeply anxious.The "Secrets" Keeper: She serves as Regina’s right-hand woman, but her loyalty is driven by fear. Her catchphrase, "That's why her hair is so big. It's full of secrets," perfectly captures her role as the group’s gossip hub.Desperate for Approval: She constantly seeks Regina’s validation, famously trying and failing to make the slang word "fetch" happen.The Breakdown: Because she bottles up Regina's emotional abuse, she is the most fragile of the group and easily cracked by Cady’s sabotage.

Signature Aesthetic: Karen favors ultra-feminine, delicate details like rhinestones, tiny bows, ribbons, and babydoll silhouettes. Her clothes often feature spaghetti straps or soft textures like fuzzy sweaters.Color Palette: She heavily leans into bright baby pinks, pastel purples, and soft blues. When they wear pink on Wednesdays, Karen's outfit is usually the most monochromatic and pastel of the bunch.Iconic Look: For Halloween, she wears a simple, sleek black mini-dress adorned with a large satin bow—paired with a pair of furry gray ears so she can comically declare, "I’m a mouse, duh!" Karen is the sweetest and least malicious member of The Plastics, primarily because she completely lacks the situational awareness to be intentionally cruel.Comically Oblivious: She is depicted as highly unintelligent, famously mistaking a "peasant top" for an actual peasant or getting lost in her own school.The "ESPN" Talent: Karen believes she possesses a sixth sense—specifically that her breasts can tell when it's raining (or rather, when it's already raining).Guileless Nature: Unlike Regina or Gretchen, Karen doesn't manipulate people for power; she simply follows the rules of the clique because she enjoys the fashion and the fun.