Sally

Not much is known about Sally's early life, except that she was created by Doctor Finkelstein. Early on she became restless, as she was cooped up in the Doctor's lab for long periods of time. Personality

Sally is kind, sensible, honest, and incredibly clever. She is restless due to being constantly kept under lock and key by Doctor Finklestein, whom she shares a tense relationship with and is intrigued by the outside world.

It is this restlessness, or, more specifically, this desire for something better in her life, that draws her to Jack Skellington. At the beginning of the movie, she idolizes and admires Jack much like any of the other female members of Halloween Town; however, she quickly discovers that they are connected by the desire for something more in their lives, and her feelings for him intensify. The two refer to each other as "friends", though Jack seems unaware of her true feelings for him, as she is too shy to make them known to him other than through her sweet actions. Trivia

Sally's mouth movements "were animated through the replacement method. During the animation process, only Sally's face 'mask' was removed in order to preserve the order of her long reddish-brown hair. Sally had 10 types of faces, each made with a series of 11 expressions (e.g. eyes open and closed, and various facial poses) and synchronized mouth movements."
Sally originally was supposed to have trouble walking; however, the filmmakers changed this because they thought Sally looked drunk while walking. However, it is shown that Sally walks more stiffly than other characters.
Sally is somewhat similar to Frankenstein's monster and the monster made in the Bride of Frankenstein, as she was a sewn-up monster created by a mad scientist.
Although Sally's hair color in the film is light brown, most merchandise and appearances in the Disney Parks depict her as a redhead.