Based (perhaps loosely) on the emerald engine from the show proper, Emily is the daughter of Sir Topham Hatt and Lady Hatt, is the niece of an Earl and as such has lived a life of privilege. While she is dutiful to her father, she is also just a little bit petulant and self righteous. She also feels a bit trapped by expectation- she has dreams of her own that she has resigned to never being realized on account of it not being suitable for her status. She should sound speak with a proper English accent (Southern England, somewhat like the Queen), should sound a tad bit stuck up and a bit like a know-it-all. This role will vary a lot in emotion and I need someone who can carry that range properly.