Andrea

Appearances
Her first appearance is in episode 3 (field transfusion). She is found by James and James to be posing as a doctor and be caring for 3 sick people on her own. James and James then encourage her to start cutting open one of the patients after a "blood transfusion" they performed. This didn't do much as the patient was already dead.

She can also briefly be seen in episode 16 (terminal joblessness part 3) sitting next to the Dean of Medicine's wife at the Dean's dinner party. This could suggest that she is related to the Dean of Medicine in some way.