legit idek bc everyone is fantastic imo. klaus is klaus. nick is a medical examiner for ucsf, kind of shy and tries to mind his own business. quiet but friendly when he has to be. before that he worked in the emergency department but took the losses too personally and started drinking. he's rootbeers's younger brother and tbh the complete polar opposite to klaus in every way (likes to have control, doesn't like being center of attention, wants to help people, etc).