Rosalina was born to an unknown mother and her father. She grew up developing an interest in music, learning how to play several instruments.
Main article: Natalina
In his only appearance, Battle of the Bands, Rosalina stated she didn't love Bobby, and only respected him as a musician. When she first sww him at the photoshoot, however, she was touched by what he said about Little Kids Rocks and the children. Bobby then offered to take her for a motorcycle ride, which she accepted.