What do Ophelia, Snow White, and Sandy from the movie "Grease" all have in common? You could call each one an ingénue, or a young female character in literature or film who is wholesome and innocent.
Ingénue comes from the French ingénu meaning "ingenuous, innocent." The term is used to describe the innocent girl stock character in film or literature. She's usually gentle, sweet, virginal, and pretty naive — which makes her susceptible to the harsh dangers of the world. Ingénue can also be used to describe an actress who specializes in playing this kind of character specifically.