She and Reginald are first seen eating at a picnic table in the beginning of "Tourist Trapped."
She is fully introduced when Reginald tries to propose to her in "The Legend of the Gobblewonker," while the two are boating together at Lake Gravity Falls. However, they are interrupted by Stan, who bothers them with a cynical joke about marriage.
In "The Hand That Rocks the Mabel," she and Reginald are both seen putting money into Stan's "Sack of Mystery," and then later seen walking to the Tent of Telepathy and watching Gideon's show, where Rosanna catches Gideon's cape when he throws it to the audience. This causes a minor scuffle among some of the older women. She also seen eating at the restaurant where Gideon and Mabel are having their date.
In "Gideon Rises," Rosanna is among the crowd when Stan unmasks Gideon as a fraud.
Rosanna is deeply in love with her boyfriend and dislikes attacks on romance. She appears to enjoy fishing and, before he was revealed to be a fraud, Gideon Gleeful's performances. She is a fan of the boy band Sev'ral Timez, though she may be ashamed to admit this.
Rosanna is a thin young woman with light brown skin, black eyes, and long dark magenta-colored hair going down to her hips. She is usually seen wearing a light purple shirt, navy blue short shorts, and black shoes.
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