Rhiana Pratchett is prominently credited at top of the Narrative credits, but shortly before the game's release she downplays her involvement in some Twitter statements:
Yes, I worked on some of the world building/cinematics. I chose not to talk about it. I have my reasons. Hope some of you enjoy it.
I was involved, yes. Mainly in some world building stuff a few years back and the pre-rendered cinematics.

Contributed by Patrick Bregger (192194) on Jul 10, 2014. -- edit trivia