Rosita is an anthropomorphic pig. She has light pink skin, slightly floppy ears, 3 pointed fingers on each hand, blonde eyebrows, green eyes, and darker pink freckles on her cheeks. She wears a pink buttoned short sleeved blouse, light blue pants, and small, pointed black slippers. During her and Gunter's performance of "Shake It Off", she wears a sparkly black costume which only exposes her legs, hands, and face. Said costume has pointed ears and sports a long feather train on the back. She also wears black heels with her costume.
In Christmas-themedTV spots, Rosita wears a red scarf, a green sweater with a white snowflake over a red undershirt, and dark green pants that become red below the knees.
Along with being able to sing, Rosita learns how to dance by just letting the music tell her body what to do.
She is also a skilled engineer, able to build, in just one night, multiple elaborate contraptions that do her housework and care for her family, even when she's not around. Her mechanical skills are implied at the beginning of the movie when Norman asks her to fix their sink.
Rosita yearns to be more than just a devoted mom to her twenty-five piglets. She rarely has a second to herself, so she finds her moments of freedom intersect with this passion for music. Rosita is also shown to be caring and supportive to the other performers, as she and Gunter, cheer Ash up after Lance cheated on her. Before she and Gunter go on stage to practice, Rosita also offers Ash her purse, which contains gum. She also allows Johnny to practice before her, and apologizes to him when Gunter prevents him from doing so.
Having given up her teenage dreams in pursuing a career in music, Rosita is a loving mother to her twenty-five children and devoted wife to her overworked husband Norman. She works as a stay-at-home mom, handling all the cooking, cleaning, and a majority of the child-rearing. While Rosita loves her family, she feels she's in a rut and wants to be more than just a wife and mother, her love of singing persisting. Her family also does not recognize her talent; her kids tease her when she sings and her husband is too tired most of the time to notice her.
Rosita's yearning comes to a head when she comes across a flyer for a singing competition hosted by Buster Moon, and she decides to audition. She sings Katy Perry's "Firework" for her audition, and she successfully earns a slot in the competition. Buster states that although she "Has a good set of pipes" she is also "boring to watch," so she is partnered up with the excitable Gunter. Rosita returns home excited and eager to share her experience with her family, but her children are too unruly and Norman is too tired to listen. In order to attend auditions while taking care of her family, Rosita constructs a vast Rube-Goldberg device to do her usual routine. The newly automated housework is unnoticed by everyone.
Working with Gunter is initially rocky, as Rosita is hesitant to dance without using printed instructions. While trying to dance during their rehearsal of Taylor Swift's "Shake It Off", she falls on her face almost immediately after the song begins. Rosita thinks she won't be able to let loose like Gunter, telling that the fire died out a long time ago, and glumly quits. However, while grocery shopping, she freely and passionately dances to "Bamboléo" by the Gipsy Kings. This gives her the confidence to return to rehearsals the next day, much to Gunter's delight. However, on the day of Nana Noodleman's rehearsal her contraption at home goes awry, and after she returns home following the Moon Theater's destruction, she finds her children and Norman hanging on the clothing line after her homemade babysitting machine malfunctioned. She returns to the Moon Theater to help fix the stage, leaving Norman to take care of the children. On the night of the show, she smiles at the sight of Norman trying to control the kids. Rosita and Gunter are the first to perform. They sing and dance to "Shake it Off", and while the audience at first laughs at its cheesiness they are shocked when, Rosita and Gunter change into matching sparkly black costumes and put on a great performance. Rosita and Gunter's performance is met with applause, and Rosita's children run up onstage to congratulate her. Norman, completely blown away, follows them, and romantically kisses his wife as the curtains close. At the end of the movie, Rosita, and her family attend the grand reopening of Moon Theater with the other characters.
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Rosita has fun with her piglets at an ice rink while "Sleigh Ride" plays. After Gunter switches the music track with his holiday-themed dance remix of "Groove Is in the Heart", he encourages Rosita to dance, only for her to fall on the ice. However, her children and the squids swimming underneath form the shape of a heart around her. At the end, she and the kids pose with the rest of the Sing cast.
Sing (McDonald's Happy Meal toy promotion)
Rosita drives her piglets to McDonald's, while the children order their Happy Meals in song form.
Sing on Tour
Pre-Show In order to stall for time, Mizuki introduces the audience to Rosita, who is practicing her dance routine for Buster Moon's upcoming show. Rosita accepts the impromptu interview, but is interrupted by her piglets, made extra-hyper by Norman's candy. Gunter is impressed by one child's dance moves and decides to incorporate them into the routine, but Rosita points out that they'd be changing it at the last minute. She then follows her piglets as they excitedly rush out of the room. When Buster is finally ready to start the show, Rosita's kids rush in front of him, Rosita following close behind.
"Um, hi, I saw your ad in the paper. Yes, I need a nanny, just for a couple of weeks. You can? Great! The kids? Yes, they're wonderful. Yeah, I have 25. No, I'm not joking. Um, but they're really no problem-- Hello? Hello?"
— Rosita, trying to get a nanny to take care of the kids on the phone, but is later disconnected
"Hey! How was the big meeting?"
— Rosita, when Norman returns home
"Listen, Norman, I know it's short notice, but I could really use some help with the kids tomorrow because, well, you are not going to believe what I did today. Norman, are you listening to me?"
— Rosita, trying to tell Norman about the singing competition and how she needs help
"I think we'll probably have a better chance of winning if I do the singing part and leave the dancing part to you."