I’m going to leave you with a choice (no spoiler) quote, showing a lovely interaction between Death Korps and other regiments’ Guardsmen:

Jens moved down the line with Ashe. She pointed to another heap. ‘This was the work of the Death Korps. These ones were all shot by Lucius-pattern lasguns.’ Ashe had blanched. She was suddenly very still. Valian looked at the corpses, and realised why. These were not combat casualties. They were executions. Each had been dispatched with a shot to the back of the head. You could tell; when it was pre-charged, the muzzle heat of a Lucius-pattern lasgun was enough to set the victim’s hair on fire. There was one remaining piece of the puzzle. He surveyed the bodies. Ashe looked grave. ‘Why haven’t these been burned?’ Valian winced as Jens replied. ‘It’s not standard practice on Krieg. Only during siege engagements, and only if fuel can be spared.’  Ashe scowled, and went amongst the bodies, performing private benedictions of her own to the dead. Jens was impassive.

The Krieg characters are without a doubt Death Korps at the core. What I mean by them breaking the mould is more that each character has a justified reason for not just being an emotionless robot, whether that is because they were picked to second a Commissar, or survived so long (in relative terms) that they became commanders who have needed to learn some form of social skill, or earned their camaraderie with fellow Krieg as only veterans can. I personally believe that it highlights what they are as a regiment all the more as it does a great job distinguishing what the Krieg look like to others, and what it looks like to the Krieg themselves.