Ernst Freidel

Major Ernst Freidel (played by Simon Lack) is Feldkommandant of Guernseyin Enemy at the Door, and works closely with Dieter Richter.

Biography
Freidel is in charge of over-seeing the civilian population on the Island. He shares an office with Richter, is mild-mannered, discreet and efficient, while sometimes displaying some quiet deviousness. He is responsible for much of the administration and paperwork. He and Richter have a good working relationship, and would probably count each other as friends as the series continues and acts on occasion to protect Richter.

Behind the scenes
According to the novelisation, Freidel suffers from migraines (which might partially explain what he's doing in 1.10 "Treason.")