Rosie is one of Queen Albia of England's many daughters, a princess of the realm.
She is a tall tan young woman with voluminous curly orange hair and green eyes.

A dance with a pretender king.
Rosie danced with Martellus von Blitzengaard during the party her mother has put on while the Deepdwellers, Agatha Heterodyne, Tarvek Sturmvoraus, Gilgamesh Wulfenbach and other notables from the continent are in England, and was very interested in what new fashions their guests might wear. She was less than excited to learn she and her sisters would be singing Heroes of the Galloping Waves to ring in the celebration, as it meant they'd be required to wear dresses with bustle embellishments emblematic of the rear of ships.