Heidi Turner is a female fourth-grade student attending South Park Elementary. Her initial appearance was as a background character in the Season Three episode, "Rainforest Shmainforest." She had her first speaking role in the 1999 film, "South Park: Bigger, Longer & Uncut."

Heidi is depicted as one of the "popular girls" in the fourth grade. She is frequently seen in the company of Wendy Testaburger, Bebe Stevens, Red McArthur, Nichole Daniels, Annie Knitts, Nelly, Jenny Simons, Lola, and numerous other fourth-grade girls.

== Appearance == Heidi is a 10-year-old with a fair complexion and light brown, shoulder-length hair. Her signature part of her attire is a purple beanie adorned with a flower. Her typical outfit includes a lime green jacket with a red collar, black pants, and red mittens.

However, during a specific period in the series, a significant physical change was observed, characterized by weight gain. This transformation began in the episode "Doubling Down" following her discovery of "Beyond KFC" and progressed further in "Moss Piglets," where her weight increased to a point nearing that of her boyfriend, Eric Cartman. During this time, she also developed facial acne, notably appearing as clusters of pimples on her left cheek and above her right eye. Despite these physical changes, she remained a fourth-grade student at South Park Elementary.

== Personality == During the period of her weight gain, Heidi's personality underwent a noticeable shift, largely influenced by her tumultuous relationship with Cartman and the negative experiences she endured. Initially, her pride prevented her from admitting the poor decision of dating him, leading her to tolerate his often abusive behavior.

As her weight increased, particularly in "Moss Piglets," she exhibited a more negative and dejected demeanor. This phase culminated in a breaking point in "Splatty Tomato," where she became vengeful, even contemplating violence against Cartman, whom she blamed for her transformation.

However, this extreme reaction ultimately led to a moment of self-reflection where she recognized her own "victim mentality" as a contributing factor to her unhappiness. This realization paved the way for her to break free from Cartman and begin the process of reclaiming her former self, both physically and emotionally.

== Trivia ==

• Heidi was initially depicted without a hat and held the record for the longest period without one until the "S**** Hunt" arc, after which she began wearing one. This change likely served to visually distinguish her after her breakup with Cartman and weight loss.
• Other characters, such as Karen McCormick, have shared her hairstyle.
• Her jacket design is seen on other characters, including Linda Triscotti, a background student.
• An African-American version of Heidi appeared in Cartman's dream in "Pee."
• "Doubling Down" revealed her Irish heritage, similar to Eric Cartman's.
• Heidi appears to have a friendly connection with Kyle Broflovski based on her experiences with Cartman.
• "Holiday Special" is the only Season Twenty-One episode without Heidi, and "Hummels & Heroin" is her only appearance in that season without dialogue.
• Since being less of a central character, her appearances have decreased, and she is seen less frequently with the other girls, with her hat usage being inconsistent.
• She was absent from the school assembly scenes in Season Twenty-Three.
• Heidi shares her last name with three other fourth graders (Sally and Tommy Turner) and a third grader (Billy Turner), all of whose names sound like "E Turner."
• Mr. Mackey considers Heidi the top science student in the fourth grade.

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