principal girl 
noun British
The leading female role in a pantomime.Young shopgirls Carly Zoeller, Sarah Clyde and Lisa-Marie Wade are bolstered by dance-trained Melissa Swindell, a former pantomime principal girl for the society....
- Mieke Jackson adds the role of Dick Whittington to her lengthy list of principal-boy performances, while principal girl Sarah Davis makes her debut for the Players as Alice Fitzwarren.
- A show with two principal girls necessitates two villains and the Players' specialists in villainy are the brace of Andys: Mr Andy Love as Sinistro, the wicked sorcerer, and Mr Andy Welch as Crunchbones, the witch doctor.