Duke wears a green suit that buttons up, white undershirt, black skirt, green socks, black mary Jane’s, and a green brooch centered perfectly in the middle of her collar. Early on, she is quiet, insecure, and overshadowed by the dominant Heather Chandler. Often seen reading Moby Dick, she suffers her leader's abuse while secretly loathing her status. Her signature color (green) symbolizes this intense envy. She is cocky at times often mocking people. Her hair is a dark brown almost resembling black often wearing it in a low ponytail with a green scrunchie holding it.

Jacket: A structured, 1980s-style yellow blazer with shoulder pads. Skirt: A pleated skirt, often in black or yellow plaid. Accessories: A thick black belt, white tights, and yellow or black heels. While she initially goes along with the clique's cruel bullying, she is often considered the nicest of the Heathers. She acts out of a deep fear of rejection and a desperate desire to belong. Behind her upbeat, superficial exterior (such as her love for going shopping), she grapples with severe depression and suicidal ideation following the traumatic events at her high school. Her hair is ginger in a ponytail with a yellow scrunchie.

Red Blazer: The centerpiece of her wardrobe, usually featuring shoulder pads, gold buttons, or chain details to assert dominance. Blouse: A classic, crisp white button-down or ruffled collar shirt layered underneath. Skirt: A pleated, black-and-white (or red-and-black) checkered or plaid skirt. Accessories: The essential Red Hair Scrunchie, which acts as the "crown" of the school's social hierarchy, along with thigh-high argyle socks and red or black heels. She maintains her absolute grip on the school's social hierarchy by exploiting the insecurities of those around her. She frequently demeans less popular students (like Martha Dunnstock) and subtly torments her own clique, such as repeatedly mocking Heather Duke's bulimia. Clad in her signature red, Heather Chandler is entirely unapologetic about her power and the way others perceive her. She knows she is at the top of the food chain and expects every situation to be meticulously tailored to her whims. Unlike other typical high school stereotypes, her cruelty isn't just for thrills. She is highly organized and systematic, constantly calculating to keep the social order exactly how she likes it.

Top: Navy blue blazer paired with a crisp white button-down shirt. Accessories: A small black bow tie or collar brooch, and sometimes a black beret. Bottom: A high-waisted, pleated or wavy plaid skirt in black and white. Legwear: Knee-high or over-the-knee blue socks.Shoes: Classic black-and-white Oxford shoes or Mary Janes. She frequently documents her existential angst in her diary, processing the superficiality of her school with a sharp, sarcastic sense of humor. While she craves belonging, she possesses a fierce sense of right and wrong. Though drawn into the cruel antics of "The Heathers" She wants everyone to be happy with no cruelty. Her hair is in a dark brown bob