At the end of a sidequest where you help the Makers rebuild an ancient construct, Death requests that the construct doesn't tell anyone that he helped it without reward.
Death's reaction to having to help Uriel when he goes to Earth:
Death: Oh, dammit.
Death's reply when Maker Elder Eideard says they must resurrect the now-destroyed Corrupted Guardian?
Death: How many times would you have me kill him?
Perhaps this wont seem that funny in the translation to text, but the combination of Death's incredulity and Blackroot's cheerful obliviousness might elicit a few chuckles.
Death: Your realm teeters on the brink of destruction and you ask me to feed you?!
Blackroot: *happily* If it's not too much trouble!
Karn's introduction:
Karn: Folks around town call me "pup" or "lad", but I prefer my own name... "Karn".