Sara appears to be something of a cat girl. She looks mostly human, but she has a cat tail. Sara's outfit consists of a yellow mini skirt with a matching midriff-baring top, a belt, a pink jacket, a black choker, pink sneakers, red gloves, and a pink sort of covering on her ears with a large green jewel on it. Later on in the movie, she wears a wedding dress that is short, has yellow trimming with a giant bow on the back of it, and has a white covering on her head with flowers on it.
One day, Sara and her father became captives by Dr. Robotnik in order for Robotnik to lure Sonic to South Island. After Sonic and Tails leave, Sara amuses herself by playing video games with Robotnik, but kept on losing (which at first resulted in her throwing a fit). After eventually getting tired of video games, Sara wishes to go for a drive and starts throwing a childish tantrum when Robotnik refuses. At that moment, Metal Robotnik crashed into the Presidential House, and Sara grows excited and demanded that Robotnik give her a ride in it, entering the control panel and playing around. Later on in the movie, Sonic, Tails, and Knuckles go to the core of Robotropolis, where, after a small series of events, Metal Robotnik appears, eventually crumbling, revealing Dr. Robotnik and Sara in it. Knuckles falsely accuses Sara of being behind his scheme by, and in reply, she cries hysterically and reveals that "The robot and the machine going haywire were all part of Robotnik's evil scheme," which Robotnik does not deny.
After Metal Sonic appears Sonic, Tails and Knuckles go to the Ice Caps, where Sara is being held captive for a forced marriage at the North Pole (Dr. Robotnik's main goal in the movie is to destroy the world, leaving only he and Sara to marry and have children together, repopulating the world). Sara is extremely repulsed and angered by the idea of becoming Robotnik's bride, so she screams and proceeds to "scratch" him. Before this, however, Robotnik gifts her with a beautiful wedding dress.
During the fight between Metal Sonic and Sonic, Metal Sonic's head crashes through the bottom of Robotnik's ship, causing him to look up her skirt, resulting in Sara repeatedly kicking his head, calling him a pervert. When Robotnik tries to grab Sonic, his ship tilts, causing Sara to fall, but is saved by Knuckles. She thanks him and kisses him on the cheek, causing him to blush and "freeze up". Throughout the rest of the movie, Sara stays with Knuckles and Tails as they watch Sonic and Metal Sonic fight. She also kisses Knuckles again to help encourage him to help her father.
As the daughter of the President, Sara is quite spoiled. She always expects to get her own way, throwing tantrums when she is beaten at a video game and even cajoling her kidnapper (Robotnik) to take her out for a drive when she's bored. She's also slightly selfish, claiming to Sonic that she doesn't care about Robotnik or even her own father's safety, and that she really wishes him to go to Robotropolis "for the two of them" and their relationship. She is not above using her femininity to get her way, for example, kissing Knuckles to persuade him to help her father.
In other media
In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Sara makes an appearance during the time Mobius Prime's history was altered by Chaos Knuckles. In this media, Sara appeared as a captive of Robotnik inside of a tube. Robotnik tells her to marry him and become his queen (wife), to which she denies. Sonic, Tails, and Knuckles soon after attempt to break through an armada of Metal Robotniks to free Sara. Immediately after however, reality was changed again, leaving Sara to be erased from history.
- Sara is reminiscent to other animal/human hybrids in the Sonic the Hedgehog Story Comic.
- Sara's tail was left out of the Archie Comics for unknown reasons. It may simply be an error.
- When Sara and Robotnik are playing the video game in Sonic the Hedgehog: The Movie, Robotnik's name in the video game reads "Eggman" and Sara's name is spelled "Seira".