Klaus is a protagonist who acts as a foil to Dorian, and, later, as his love interest. He is a West German intelligence agent serving in NATO. He is nicknamed "Iron Klaus" by enemy characters for his notoriously high number of successful missions. Klaus's missions involve averting international incidents and collecting intelligence, and are frequently disrupted by Dorian. Klaus reacts to Dorian's flirting and confessions of love with violence and pronounced homophobia. Despite this, he is occasionally cordial with Dorian when they have worked together on a mission successfully.

Klaus's crew of 26 subordinates are each named after a letter of the alphabet: A, B, G, and Z appear in the series most frequently. A is in second command, B is generally portrayed as a bumbling clown, G enjoys cross-dressing, and Z, the youngest, is Klaus's favourite. All of Klaus's subordinates live in fear of his ire and his constant threats to reassign them to Alaska.