Julianna Rose Mauriello

Stephanie was originally created by Magnús Scheving for the stage play Áfram Latibær as "Solla Stirða" ("Solla Stiff"), a girl with stiff joints who dreamt of becoming a dancer. Solla also appeared in the sequel to the stage play, Glanni Glæpur í Latabæ. She was played by Selma Björnsdóttir and Linda Ásgeirsdóttir, respectively. Magnús Scheving reworked Solla into Stephanie for the LazyTown television show. Shelby Young was originally pegged to play Stephanie in 2003, and filmed one unaired pilot before departing due to union issues. Ultimately, Julianna Rose Mauriello was chosen to play Stephanie, and played her for the first two seasons and LazyTown Extra before departing due to aging out of the role. Chloe Lang picked up the role of Stephanie for seasons three, four, and LazyTown Motivational Campaigns. And as of 2024, she is the most recent actress to play Stephanie.

Stephanie tends to wear a pink sleeveless dress with pale blush pink tights, pink socks, white and pink sneakers and a purple hairband. Her outfit, though, changes from time to time. For example, in "LazyTown Goes Digital" and "Energy Book", she wears pink leggings with her usual dress. She also wears tracksuits and other items of clothing, but they are nearly always pink. Her short bob hair is dyed pink. All her accessories are also pink. She also has long, curled eyelashes and slightly blushing cheeks. She is often seen carrying a pink purse with a heart on it, in which she carries her pink diary. As a pirate, she wore a pink bandanna with a white, fancy letter "S" on it for Stephanie, as well as a striped shirt, loose ripped pink leggings and pink socks. As a princess, she had longer curly hair in pigtails and wore a loose fuchsia princess dress.