Violet Parr
Screenwriter and director Brad Bird conceived Violet as "a teenage girl who just wants to be invisible". In early drafts of the screenplay, Violet is depicted as an infant as opposed to a teenager, since parents Bob and Helen Parr were originally intended to be introduced as retired superheroes who have just begun to attempt to live normal lives much earlier during the film. Violet is voiced by American author and actress Sarah Vowell, who related that she was offered the role unexpectedly. While beginning to cast the film's main characters, Bird had been listening to the National Public Radio program "This American Life", to which Vowell is a frequent contributor. During one of Vowell's regular appearances on the show, Bird heard her contribute an anecdote about a cannon she had helped her father, a gunsmith, build. Bird wanted to cast Vowell based on her description of the event, deciding that she was "perfect" for the part and immediately calling her to offer her the role. Vowell had already earned a reputation for declining several voice acting jobs prior to "The Incredibles", to the point at which her agent warned Bird, "She's a serious writer and she wouldn't do this, so don't waste your time!" However, Vowell states that she simply avoided pursuing animated roles in general because she was content being a writer and found few animated projects particularly interesting prior to "The Incredibles".
The animators animated a rough test sequence to some of Vowell's dialogue from the radio segment about her father's cannon, in which Violet is depicted being startled by a gun that repeatedly fires in her hands. Despite experiencing some hesitation due having never voiced an animated character before, Vowell accepted the role after receiving an e-mail from the film's producer, agreeing to participate in "The Incredibles" because she believes that Pixar is consistently "the best at what they do", comparing the offer to "if Nelson Mandela showed up asking for your help to fight racism". Additionally, she had also been a long-time fan of Bird's work as a filmmaker. Vowell ultimately decided to accept the role based on a sole image she had been sent of the character: a drawing of Violet surrounded by her schoolmates, all of whom appear to be happy and outgoing apart from Violet herself, who is instead hunched over and hiding behind her long hair. Vowell concluded, "I can be that kid. I was that kid. I love that archetype of the morose, shy, smart-alecky teenage girl."
Violet Parr
Violet appears in the film's sequel "Incredibles 2" (2018), in which she receives more screen time. The film follows Violet as she struggles with being a teenager and a superhero simultaneously, resuming shortly after Violet and Tony have agreed to go on their first date. Tony witnesses Violet and her family battling The Underminer, discovering that Violet is a superhero when she unknowingly removes her mask in his presence, prompting him to run away. Violet protects her family from The Underminer by creating her most powerful force field to-date. Despite limiting the destruction of the villain, superheroes remain illegal, and the Parrs remain prohibited to use their powers, which frustrates Violet. Government agent Rick Dicker erases Tony's memories of the event and inadvertently wipes Tony's memory of Violet altogether, forcing Violet to come to terms with the consequences. Violet's storyline revolves around her struggling with teenage angst, boys, dating and adolescence, while mother Helen, who has been recruited by a pair of entrepreneurs in order to repair superheroes' public image in the hopes of legalizing them again, leaves Violet and her siblings in Bob's charge, who becomes challenged with parenting Violet, attempting to make her feel better as she explores her teenage romance. Although initially resentful towards Bob for the fact that Dicker erased Tony's memories of her to the point of which she "renounces" her superhero heritage, Violet eventually offers assistance upon realizing how much effort her father is putting into raising his children. At the end of the film, Violet simply re-introduces herself to Tony. Just as the characters are about to begin their first date, Violet postpones their date so that she can help her family fight criminals instead, promising to rejoin him afterward.