Emma Messinger is a Special Adviser to Peter Mannion, the Secretary of State for Social Affairs and Citizenship. She is also seen occasionally helping spin doctor Stewart Pearson with Party political business.
Emma is often implied to have come from a wealthy, conservative background. Her mother left her family when she was young; she is apparently still in contact with her father, since her ex-boyfriend Ollie Reeder once got into a fight with him at dinner over the use of racial slurs.
She is shown to be the more competent of Peter Mannion's two Special Advisers, and potentially has ambitions beyond DoSAC and Mannion based on her later working relationship with Stewart Pearson. Her relationship with flatmate and coworker Phil Smith is affectionately competitive and occasionally openly antagonistic.