Julia brings Fluffster with her everywhere. She is often seen holding him as a source of comfort, especially when she feels anxious or upset, and even when she's engaged in drawing or another activity. Julia sometimes pretends to make Fluffster bounce, bobbing the toy up and down and chanting "boing, boing, boing..."
In Julia's debut episode on Sesame Street, she creates a painting of a bunny resembling Fluffster with wings on its back. An animated video, narrated by Julia and her brother Samuel, features Fluffster as a superhero.
Family Forever: A Julia Storybook involves Julia accidentally losing Fluffster while out on a family picnic. Julia's family, along with Elmo and Abby Cadabby, help her look for Fluffster in the park. As mentioned in the story by Julia, Fluffster's favorite picnic food is frogs.
Fluffster figures prominently in the plot of Episode 5021, titled "The Fluffster Kerfuffle." Caught up in playing superheroes with Elmo and Abby, Rudy grabs Fluffster to use as part of their game, causing Julia to become very upset. Alan explains that because Fluffster is so special to Julia, it's not a toy she likes to share.